Open Access
ARTICLE
Yanpu Chao1,*, Fulai Cao1, Hao Yi2,3,*, Shuai Lu1, Yaohui Li1, Hui Cen1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.051962
Abstract The so-called fourth-generation biodegradable vascular stent has become a research hotspot in the field of bioengineering because of its good degradation ability and drug-loading characteristics. However, the preparation
of polymer-degraded vascular stents is affected by known problem such as poor process flexibility, low forming
accuracy, large diameter wall thickness, limited complex pore structure, weak mechanical properties of radial support and high process cost. In this study, a deposition technique based on a high-voltage electric-field-driven continuous rotating jet is proposed to fabricate fully degraded polymer vascular stents. The experimental results show
that, due to the rotation… More >
Open Access
ARTICLE
Christina Khokhryakova1,*, Konstantin Kostarev2, Irina Mizeva3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.051053
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract Magnetic fluids, also known as ferrofluids, are versatile functional materials with a wide range of applications. These applications span from industrial uses such as vacuum seals, actuators, and acoustic devices to medical uses, including serving as contrast agents for magnetic resonance imaging (MRI), delivering medications to specific locations within the body, and magnetic hyperthermia for cancer treatment. The use of a non-wettable immiscible liquid substrate to support a layer of magnetic fluid opens up new possibilities for studying various fluid flows and related instabilities in multi-phase systems with both a free surface and an interface.… More >
Graphic Abstract
Open Access
ARTICLE
Hong Lan1,3, Jiye Zhang1,*, Yao Zhang1, Lu Cai2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052609
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract To investigate the influence of snow particle rotational motion on the accumulation of snow in the bogie region of high-speed trains, an Euler‒Lagrange numerical approach is adopted. The study examines the effects of snow particle diameter and train speed on the ensuing dynamics. It is shown that considering snow particle rotational motion causes significant deviation in the particle trajectories with respect to non-rotating particles. Such a deviation increases with larger snow particle diameters and higher train speeds. The snow accumulation on the overall surface of the bogie increases, and the amount of snow on the More >
Open Access
ARTICLE
Mahdi Goucem*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052365
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract In hot and arid regions like the Saharan area, effective methods for cooling and humidifying intake air are essential. This study explores the utilization of a water trickle cooler as a promising solution to meet this objective. In particular, the HASSI MESSAOUD area is considered as a testbed. The water trickle cooler is chosen for its adaptability to arid conditions. Modeling results demonstrate its effectiveness in conditioning air before it enters the compressor. The cooling system achieves a significant temperature reduction of 6 to 8 degrees Celsius, enhancing mass flow rate dynamics by 3 percent More >
Open Access
REVIEW
Qiuyang Cheng1,2,3, Lijun You3,*, Cheng Chang1,2, Weiyang Xie1,2, Haoran Hu1,2, Xingchen Wang1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.051200
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract Horizontal well drilling and multi-stage hydraulic fracturing technologies are at the root of commercial shale gas development and exploitation. During these processes, typically, a large amount of working fluid enters the formation, resulting in widespread water-rock interaction. Deeply understanding such effects is required to optimize the production system. In this study, the mechanisms of water-rock interaction and the associated responses of shale fabric are systematically reviewed for working fluids such as neutral fluids, acid fluids, alkali fluids and oxidative fluids. It is shown that shale is generally rich in water-sensitive components such as clay minerals,… More >
Open Access
ARTICLE
Mina Amazal1,*, Soumia Mounir1,2, Asma Souidi1, Malika Atigui1, Slimane Oubeddou1, Youssef Maaloufa1,2, Ahmed Aharoune1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050613
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract Nowadays, materials with a limited impact on the environment are required in the construction sector. Considering the interesting properties of natural elements such as natural fibers, it seems advantageous to use them to reinforce materials while protecting the environment and guaranteeing economic gain. Along these lines, this research was devoted to studying the effect of untreated natural fibers extracted from the Juncus maritimus plant (from Southern Morocco) on plaster. First, the effect of the percentage of added fibers on the fluidity of the plaster was evaluated by means of the Marsh’s cone method, that is,… More >
Open Access
ARTICLE
Sha Liu*, Jianfa Wu, Xuefeng Yang, Weiyang Xie, Cheng Chang
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052454
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract The pivotal areas for the extensive and effective exploitation of shale gas in the Southern Sichuan Basin have
recently transitioned from mid-deep layers to deep layers. Given challenges such as intricate data analysis, absence
of effective assessment methodologies, real-time control strategies, and scarce knowledge of the factors influencing deep gas wells in the so-called flowback stage, a comprehensive study was undertaken on over 160 deep
gas wells in Luzhou block utilizing linear flow models and advanced big data analytics techniques. The research
results show that: (1) The flowback stage of a deep gas well presents… More >
Graphic Abstract
Open Access
ARTICLE
Xin Guan*, Yuqi Xie, Shuaijie Wang, Mingyang Li, Shiwei Wu
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049671
Abstract The effects of the erosion present on the leading edge of a wind turbine airfoil (DU 96-W-180) on its aerodynamic performances have been investigated numerically in the framework of a SST k–ω turbulence model based on the Reynolds Averaged Navier-Stokes equations (RANS). The results indicate that when sand-induced holes and small pits are involved as leading edge wear features, they have a minimal influence on the lift and drag coefficients of the airfoil. However, if delamination occurs in the same airfoil region, it significantly impacts the lift and resistance characteristics of the airfoil. Specifically, as More >
Open Access
ARTICLE
Xin Guan1,2,*, Mingyang Li1, Shiwei Wu1, Yuqi Xie1, Yongpeng Sun1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049499
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract The focus of this research was on the equivalent particle roughness height correction required to account for the presence of ice when determining the performances of wind turbines. In particular, two icing processes (frost ice and clear ice) were examined by combining the FENSAP-ICE and FLUENT analysis tools. The ice type on the blade surfaces was predicted by using a multi-time step method. Accordingly, the influence of variations in icing shape and ice surface roughness on the aerodynamic performance of blades during frost ice formation or clear ice formation was investigated. The results indicate that More >
Open Access
ARTICLE
Mingjing Lu1,2,*, Qin Qian1, Anhai Zhong1, Feng Yang1, Wenjun He1, Min Li1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.051594
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract Continental shale oil reservoirs, characterized by numerous bedding planes and micro-nano scale pores, feature significantly higher stress sensitivity compared to other types of reservoirs. However, research on suitable stress sensitivity characterization models is still limited. In this study, three commonly used stress sensitivity models for shale oil reservoirs were considered, and experiments on representative core samples were conducted. By fitting and comparing the data, the “exponential model” was identified as a characterization model that accurately represents stress sensitivity in continental shale oil reservoirs. To validate the accuracy of the model, a two-phase seepage mathematical model More >
Open Access
ARTICLE
Ao Lu1, Ming Xiong1, Chen Chen1, Liangjiang Li1, Haibei Tan1, Xiong Xu2,3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.051010
（This article belongs to the Special Issue: Advances in Rheological Property Evaluation of Bitumen and Bituminous Mixtures)
Abstract Traditional asphalt rejuvenators, like aromatic oil (AO), are known to be effective in improving the low-temperature properties and fatigue performances of aged SBS (styrene-butadiene-styrene) modified asphalt (SBSMA) binders and mixtures. However, these rejuvenators inevitably compromise their high-temperature properties and deformation resistances because they dilute asphalt binder but do not fix the damaged structures of aged SBS. In this study, a highly-active chemical called polymerized 4,4-diphenylmethane diisocyanate (PMDI) was used to assist the traditional AO asphalt rejuvenator. The physical and rheological characteristics of rejuvenated SBSMA binders and the moisture-induced damage and rut deformation performances of corresponding… More >
Graphic Abstract
Open Access
ARTICLE
Amira M’hadbi1,2,*, Mohammed El Ganaoui1, Haïkel Ben Hamed3, Amenallah Guizani2, Khalid Chtaibi3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050763
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract The behavior of non-Newtonian power-law nanofluids under free convection heat transfer conditions in a cooled square enclosure equipped with a heated fin is investigated numerically. In particular, the impact of nanofluids, composed of water and Al₂O₃, TiO₂, and Cu nanoparticles, on heat transfer enhancement is examined. The aim of this research is also to analyze the influence of different parameters, including the Rayleigh number (Ra = 10 − 10), nanoparticle volume fraction (φ = 0% − 20%), non-Newtonian power-law indexes (n = 0.6 − 1.4), and fin dimensions (Ar = 0.3, 0.5, and 0.7). Streamlines and isotherms are used… More >
Open Access
ARTICLE
Vigneshvaran Sethuraman1, Parvathy Rajendran1,*, Sher Afghan Khan2, Abdul Aabid3, Muneer Baig3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049441
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract This study deals with base pressure management in a duct for various values of the Mach number (M), namely, Mach number corresponding to sonic and four supersonic conditions. In addition to the Mach number, the nozzle pressure ratio (NPR), the area ratio, the rib dimension, and the duct length are influential parameters. The following specific values are examined at M = 1, 1.36, 1.64, and 2, and NPRs between 1.5 and 10. The base pressure is determined by positioning ribs of varying heights at predetermined intervals throughout the length of the square duct. When the… More >
Open Access
ARTICLE
Ambareen Khan1, Sher Afghan Khan2, Mohammed Nishat Akhtar1,*, Abdul Aabid3,*, Muneer Baig3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049368
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract When better fuel-air mixing in the combustion chamber or a reduction in base drag are required in vehicles, rockets, and aeroplanes, the base pressure control is activated. Controlling the base pressure and drag is necessary in both scenarios. In this work, semi-circular ribs with varying diameters (2, 4, and 6 mm) positioned at six distinct positions (0.5D, 1D, 1.5D, 2D, 3D, and 4D) inside a square duct with a side of 15 mm are proposed as an efficient way to apply the passive control technique. In-depth research is done on optimising rib size for various More >
Graphic Abstract
Open Access
ARTICLE
Kirill Rysin*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052324
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract The study of average convection in a rotating cavity subjected to modulated rotation is an interesting area for the
development of both fundamental and applied science. This phenomenon finds application in the field of mass
transfer and fluid flow control, relevant examples being crystal growth under reduced gravity and fluid mixing in
microfluidic devices for cell cultures. In this study, the averaged flow generated by the oscillating motion of a fluid
in a planar layer rotating about a horizontal axis is experimentally investigated. The boundaries of the layer are
maintained at constant temperatures, while the… More >
Open Access
ARTICLE
Kaiyong Hu1,2,*, Zhaoyi Chen1, Yunqing Hu1, Huan Sun1, Zhili Sun1, Tonghua Zou1,3, Jinghong Ning1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050773
（This article belongs to the Special Issue: Visual digital analysis and optimization in phase change heat transfer processes)
Abstract The current study focuses on spray cooling applied to the heat exchange components of a cooling tower. An optimization of such processes is attempted by assessing different spray flow rates and droplet sizes. For simplicity, the heat exchanger of the cooling tower is modeled as a horizontal round tube and a cooling tower spray cooling model is developed accordingly using a computational fluid dynamics (CFD) software. The study examines the influence of varying spray flow rates and droplet sizes on the heat flow intensity between the liquid layer on the surface of the cylindrical tube… More >
Graphic Abstract
Open Access
ARTICLE
Xiao Sun1, Huifan Huang1, Yuliang Zhang2, Lianghuai Tong3,*, Xiaowei Xu2, Xiaoqi Jia4, Litao Ou5
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050997
Abstract In order to obtain the transient characteristics of a low-speed centrifugal pump during the start-up and shutdown stages, dedicated experimental tests were conducted with eight different valve opening conditions. The Pearson correlation coefficient was used to reveal the linear correlation between variables. According to the results, the stable rotational speed decreases with increasing valve opening (rotational speed decreases from approximately 1472 to 1453 r/min), while the stable shaft power exhibits an increasing trend (shaft power increases from approximately 0.242 to 0.390 kW). The stable time and zeroing time of each parameter during start-up and shutdown More >
Open Access
ARTICLE
Lan Huang1, Wenbin Yuan1, Hisham Essawy2, Xiaojian Zhou3,*, Xinyi Chen3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052445
Abstract Tannin foam is a new functional material. It can be widely applied to the automobile industry, construction industry, and packaging industry due to its wide range of raw materials, renewable, easily degraded, low cost and almost no pollution. Preparing tannin foam is a very complex process that includes high temperature, two phases, mechanical agitation, and phase change. To investigate the influence of the stirring velocity and paddle shape, simulation was calculated by making use of the volume of fluid (VOF) method and multiple reference frame (MRF) method in a three-dimensional flow field of tannin-based foaming… More >
Open Access
ARTICLE
Olga Vlasova*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.051202
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract The dynamics of rotating hydrodynamic systems containing phase inclusions are interesting due to the related
widespread occurrence in nature and technology. The influence of external force fields on rotating systems can
be used to control the dynamics of inclusions of various types. Controlling inclusions is of current interest for
space technologies. In low gravity, even a slight vibration effect can lead to the appearance of a force acting
on phase inclusions near a solid boundary. When vibrations are applied to multiphase hydrodynamic systems,
the oscillating body intensively interacts with the fluid and introduces changes in… More >
Open Access
ARTICLE
Jin Yang1,2, Senye Liu1, Xingyang He1,2,*, Ying Su1,2, Jingyi Zeng2, Bohumír Strnadel1,3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050360
（This article belongs to the Special Issue: Advances in Solid Waste Processing and Recycling Technologies for Civil Engineering Materials)
Abstract Phosphate tailings are usually used as backfill material in order to recycle tailings resources. This study considers the effect of the mix proportions of clinker-free binders on the fluidity, compressive strength and other key performances of cementitious backfill materials based on phosphate tailings. In particular, three solid wastes, phosphogypsum (PG), semi-aqueous phosphogypsum (HPG) and calcium carbide slag (CS), were selected to activate wet ground granulated blast furnace slag (WGGBS) and three different phosphate tailings backfill materials were prepared. Fluidity, rheology, settling ratio, compressive strength, water resistance and ion leaching behavior of backfill materials were determined.… More >
Open Access
ARTICLE
Hong Dong1, Xiding Gao2,*, Xinqi Zhang1, Qian Wang1,3, Haipeng Xu1, Binrui Wang2, Chengguo Gao1, Kaiwen Luo2, Hengyi Jiang2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049406
Abstract CO pre-injection during hydraulic fracturing is an important method for the development of medium to deep heavy oil reservoirs. It reduces the interfacial tension and viscosity of crude oil, enhances its flowability, maintains reservoir pressure, and increases reservoir drainage capacity. Taking the Badaowan Formation as an example, in this study a detailed three-dimensional geomechanical model based on static data from well logging interpretations is elaborated, which can take into account both vertical and horizontal geological variations and mechanical characteristics. A comprehensive analysis of the impact of key construction parameters on Pre-CO based fracturing (such as More >
Open Access
ARTICLE
Hao Chen1,2, Xianbin Teng2,*, Faxin Zhu1,*, Zhibin Zhang2, Jie Wang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049731
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract Scouring experiments were conducted using a three-dimensional laser scanning technology for angles of the jet spanning the interval from 0° to 30°, and the characteristics of the scour hole in equilibrium conditions were investigated accordingly. The results indicate that the optimal scouring effects occur when the jet angle is in the ranges between 15° and 20°. Moreover, the dimensionless profiles of the scour hole exhibit a high degree of similarity at different jet angles. Numerical simulations conducted using the Flow-3D software to investigate the bed shear stress along the jet impingement surface have shown that More >
Open Access
ARTICLE
Yubo Wang1,2,*, Yanan Yu1,2, Qiming Wang3, Anxun Liu3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049510
Abstract A model is proposed for liquid film profile prediction in gas-liquid two-phase flow, which is able to provide the film thickness along the circumferential direction and the pressure gradient in the flow direction. A two-fluid model is used to calculate both gas and liquid phases’ flow characteristics. The secondary flow occurring in the gas phase is taken into account and a sailing boat mechanism is introduced. Moreover, energy conservation is applied for obtaining the liquid film thickness distribution along the circumference. Liquid film thickness distribution is calculated accordingly for different cases; its values are compared More >
Open Access
ARTICLE
Ivan Shubenkov1,2,*, Tatyana Lyubimova1,2, Evgeny Sadilov1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050167
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract In this paper, we study the onset and development of three-dimensional convection in a tilted porous layer saturated with a liquid. The layer is subjected to a gravitational field and a strictly vertical temperature gradient. Typically, problems of thermal convection in tilted porous media saturated with a liquid are studied by assuming constant different temperatures at the boundaries of the layer, which prevent these systems from supporting conductive (non-convective) states. The boundary conditions considered in the present work allow a conductive state and are representative of typical geological applications. In an earlier work, we carried… More >
Open Access
ARTICLE
Aleksandr Poluyanov*, Ilya Kolesnichenko
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050165
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract The article presents an experimental study on the flow of an eutectic gallium alloy in a cylindrical cell, which is placed in an alternating magnetic field. The magnetic field is generated by a coil connected to an alternating current source. The coil is located at a fixed height in such a way that its plane is perpendicular to the gravity vector, which in turn is parallel to the axis of the cylinder. The position of the cylinder can vary in height with respect to the coil. The forced flow of the considered electrically conductive liquid… More >
Graphic Abstract
Open Access
ARTICLE
H. Benzzine, H. Labrim, Aouatif Saad*, Y. Achour, D. Zejli, R. El Bouayadi
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050557
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract This study addresses the pressing need for energy-efficient greenhouse management by focusing on the innovative
application of natural ventilation. The primary objective of this study is to evaluate various ventilation strategies
to enhance energy efficiency and optimize crop production in agricultural greenhouses. Employing advanced
numerical simulation tools, the study conducts a comprehensive assessment of natural ventilation’s effectiveness
under real-world conditions. The results underscore the crucial role of the stack effect and strategic window positioning in greenhouse cooling, providing valuable insights for greenhouse designers. Our findings shed light on
the significant benefits of optimized ventilation and More >
Open Access
RETRACTION
Yuanjun Dai1,4,*, Dong Wang1, Xiongfei Liu2, Weimin Wu3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.053146
Abstract This article has no abstract. More >
Open Access
ARTICLE
Shengqiang Shi1,2,*, Abdelatif Merabtine3, Rachid Bennacer4, Julien Kauffmann2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.050547
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract At present, air handling units are usually used indoors to improve the indoor environment quality. However,
while introducing fresh air to improve air quality, air velocity has a certain impact on the occupants’ thermal
comfort. Therefore, it is necessary to explore the optimization of air-fluid-body interaction dynamics. In this
study, the indoor air flow was changed by changing the opening and closing degree of the blower, and the thermal
manikin is introduced to objectively evaluate the human thermal comfort under different air velocities. The main
experimental results show that the air change rate increases with… More >
Open Access
ARTICLE
Rachid Karra1,*, Abdelatif Maslouhi2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048447
Abstract Recent studies have underscored the significance of the capillary fringe in hydrological and biochemical processes. Moreover, its role in shallow waters is expected to be considerable. Traditionally, the study of groundwater flow has centered on unsaturated-saturated zones, often overlooking the impact of the capillary fringe. In this study, we introduce a steady-state two-dimensional model that integrates the capillary fringe into a 2-D numerical solution. Our novel approach employs the potential form of the Richards equation, facilitating the determination of boundaries, pressures, and velocities across different ground surface zones. We utilized a two-dimensional Freefem++ finite element model… More >
Open Access
ARTICLE
Yuanyuan Zhao1, Fujian Zhao2, Guohui Li3, Wei Xu4,*, Xiuli Wang2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047298
Abstract Self-excited oscillating jets (SOJ) are used in several practical applications. Their performances are significantly affected by structural parameters and the target distance. In this study, a geometric model of the SOJ nozzle accounting for multiple structural parameters is introduced, then the related cavitation performances and the optimal target distance are investigated using a Large-Eddy Simulation (LES) approach. Results are also provided about an experiment, which was conducted to validate the simulation results. By analyzing the evolution of the vapor volume fraction at the nozzle outlet, a discussion is presented about the effect of the aforementioned… More >
Open Access
REVIEW
Artur V. Dmitrenko1,2,*, Vladislav M. Ovsyannikov2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048389
Abstract The differential equations of continuum mechanics are the basis of an uncountable variety of phenomena and technological processes in fluid-dynamics and related fields. These equations contain derivatives of the first order with respect to time. The derivation of the equations of continuum mechanics uses the limit transitions of the tendency of the volume increment and the time increment to zero. Derivatives are used to derive the wave equation. The differential wave equation is second order in time. Therefore, increments of volume and increments of time in continuum mechanics should be considered as small but finite More >
Open Access
ARTICLE
Nan Liu1,2, Chen Hong3,4,5, Xinchao Su3,4,5, Xing Jin1,2, Chen Jiang3,4,5,*, Yuqi Shi1,2, Bingkun Wang1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047427
Abstract As the velocity of a train increases, the corresponding air pumping power consumption of the brake discs
increases proportionally. In the present experimental study, a standard axle-mounted brake disc with circumferential pillars was analyzed using a 1:1 scale model and a test rig in a wind tunnel. In particular, three upstream
velocities were selected on the basis of earlier investigations of trains operating at 160, 250, and 400 km/h, respectively. Moreover, 3D steady computational fluid dynamics (CFD) simulations of the flow field were conducted to
compare with the wind tunnel test outcomes. The results for More >
Open Access
ARTICLE
Long Yu, Dongdong Pang*, Minmin She, Hongwei Qiu, Ping Cao, Xiongwei You
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048093
Abstract In this study, the motion of wet particles in the drying unit of a vertical powder dryer is investigated by using a Discrete element method (DEM) coupled with a liquid bridge force. In particular, by varying parameters such as the particle mass flow rates, the superficial gas velocities, and superficial gas temperatures, the influence of the moisture content on the flow behavior is examined. The results show that when the moisture content increases, the mean particle velocity decreases while the bed mean solid “holdup” and the mean residence time (MRT) of particles grow. It is More >
Open Access
ARTICLE
O. N. Goncharova1, V. B. Bekezhanova2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047959
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract The dynamics of a bilayer system filling a rectangular cuvette subjected to external heating is studied. The influence of two types of thermal exposure on the flow pattern and on the dynamic contact angle is analyzed. In particular, the cases of local heating from below and distributed thermal load from the lateral walls are considered. The simulation is carried out within the frame of a two-sided evaporative convection model based on the Boussinesq approximation. A benzine–air system is considered as reference system. The variation in time of the contact angle is described for both heating More >
Graphic Abstract
Open Access
ARTICLE
Guochen Xu*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048337
Abstract Microscopic pore structure in continental shale oil reservoirs is characterized by small pore throats and complex
micro-structures. The adsorption behavior of hydrocarbons on the pore walls exhibits unique physical and
chemical properties. Therefore, studying the adsorption morphology of hydrocarbon components in nanometer-sized pores and clarifying the exploitation limits of shale oil at the microscopic level are of great practical
significance for the efficient development of continental shale oil. In this study, molecular dynamics simulations
were employed to investigate the adsorption characteristics of various single-component shale oils in inorganic
quartz fissures, and the influence of pore… More >
Open Access
ARTICLE
Yu Wang1,2, Mengyang Ma1,2,*, Yong Long1,2, Qingxiang Zhao1,2, Zhifei Cheng1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048695
（This article belongs to the Special Issue: Advances in Solid Waste Processing and Recycling Technologies for Civil Engineering Materials)
Abstract
Shrinkage-induced cracking is a common issue in concrete structures, where the formation of cracks not only affects the aesthetic appearance of concrete but also potentially reduces its durability and strength. In this study, the effect of ceramsite sand addition on the properties of a ternary system of cement-ground granulated blast furnace slag (GGBFS)-phosphogypsum (PG) is investigated. In particular, the fluidity, rheology, hydration heat, compressive strength, autogenous shrinkage, and drying shrinkage of the considered mortar specimens are analyzed. The results indicate that an increase in PG content leads to a decrease in fluidity, higher viscosity, lower exothermic
More >Open Access
ARTICLE
Zhihui Du1, Mengge Yu1,*, Jiali Liu2, Xiulong Yao1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047315
Abstract Snow interacting with a high-speed train can cause the formation of ice in the train bogie region and affect its safety. In this study, a wind-snow multiphase numerical approach is introduced for high-speed train bogies on the basis of the Euler-Lagrange discrete phase model. A particle-wall impact criterion is implemented to account for the presence of snow particles on the surface. Subsequently, numerical simulations are conducted, considering various snow particle diameter distributions and densities. The research results indicate that when the particle diameter is relatively small, the distribution of snow particles in the bogie cavity More >
Open Access
ARTICLE
Yuanjun Dai1,4,*, Dong Wang1, Xiongfei Liu2, Weimin Wu3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.046158
Abstract To enhance the aerodynamic performance of wind turbine blades, this study proposes the adoption of a bionic airfoil inspired by the aerodynamic shape of an eagle. Based on the blade element theory, a non-uniform extraction method of blade elements is employed for the optimization design of the considered wind turbine blades. Moreover, Computational Fluid Dynamics (CFD) is used to determine the aerodynamic performances of the eagle airfoil and a NACA2412 airfoil, thereby demonstrating the superior aerodynamic performance of the former. Finally, a mathematical model for optimizing the design of wind turbine blades is introduced and More >
Open Access
ARTICLE
Tiantian Yu1, Youping Lv1, Hao Zhong2, Ming Liu1, Pingyuan Gai1, Zeju Jiang1, Peng Zhang1, Xingkai Zhang2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049035
Abstract A new measurement device, consisting of swirling blades and capsule-shaped throttling elements, is proposed in this study to eliminate typical measurement errors caused by complex flow patterns in gas-liquid flow. The swirling blades are used to transform the complex flow pattern into a forced annular flow. Drawing on the research of existing blockage flow meters and also exploiting the single-phase flow measurement theory, a formula is introduced to measure the phase-separated flow of gas and liquid. The formula requires the pressure ratio, Lockhart-Martinelli number (L-M number), and the gas phase Froude number. The unknown parameters More >
Open Access
ARTICLE
Yun Ren1,*, Lianzheng Zhao2, Xiaofan Mo2, Shuihua Zheng2, Youdong Yang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.046274
Abstract A coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) approach is used to calculate the interaction of a flexible rag transported by a fluid current with a fixed solid cylinder. More specifically a hybrid Eulerian-Lagrangian approach is used with the rag being modeled as a set of interconnected particles. The influence of various parameters is considered, namely the inlet velocity (1.5, 2.0, and 2.5 m/s, respectively), the angle formed by the initially straight rag with the flow direction (45°, 60° and 90°, respectively), and the inlet position (90, 100, and 110 mm, respectively). The results show More >
Graphic Abstract
Open Access
ARTICLE
Chenkai Hong1,2,*, Zhongda Lyu2,*, Fei Wang2, Zhuo Zhao2, Lei Wang2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.042685
Abstract To scrutinize the characteristics of wave–current loads on a bridge shuttle-shaped cap–pile foundation, a 1:125 test model was considered in a laboratory flume. The inline, transverse and vertical wave–current forces acting on the shuttle-shaped cap–pile group model were measured considering both random waves and a combination of random waves with a current. The experimental results have shown that the wave–current forces can be well correlated with the wave height, the wavelength, the current velocity, the incident direction and the water level in the marine environment. An increase in the current velocity can lead to a More >
Open Access
ARTICLE
Dmitry Bratsun*, Kirill Kostarev
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048206
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract
Swarms of self-organizing bots are becoming important elements in various technical systems, which include the control of bacterial cyborgs in biomedical applications, technologies for creating new metamaterials with internal structure, self-assembly processes of complex supramolecular structures in disordered media, etc. In this work, we theoretically study the effect of sudden fluidization of a dense group of bots, each of which is a source of heat and follows a simple algorithm to move in the direction of the gradient of the global temperature field. We show that, under certain conditions, an aggregate of self-propelled bots can fluidize,
… More >
Open Access
ARTICLE
Xin Liu1,*, Kai Yan2, Bo Fang3, Xiaoyu Sun3, Daqiang Feng4, Li Yin5
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047922
Abstract In response to the complex characteristics of actual low-permeability tight reservoirs, this study develops a meshless-based numerical simulation method for oil-water two-phase flow in these reservoirs, considering complex
boundary shapes. Utilizing radial basis function point interpolation, the method approximates shape functions
for unknown functions within the nodal influence domain. The shape functions constructed by the aforementioned meshless interpolation method have δ-function properties, which facilitate the handling of essential aspects
like the controlled bottom-hole flow pressure in horizontal wells. Moreover, the meshless method offers greater
flexibility and freedom compared to grid cell discretization, making it simpler… More >
Open Access
ARTICLE
Yuanjun Dai1,2,3,*, Zetao Deng1, Baohua Li2, Lei Zhong1, Jianping Wang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.046828
（This article belongs to the Special Issue: Aerodynamic Analysis and Optimal Design of Fluid Machinery)
Abstract A combined experimental and numerical research study is conducted to investigate the complex relationship between the structure and the aerodynamic performances of an Archimedes spiral wind turbine (ASWT). Two ASWTs are considered, a prototypical version and an improved version. It is shown that the latter achieves the best aerodynamic performance when the spread angles at the three sets of blades are α1 = 30°, α2 = 55°, α3 = 60°, respectively and the blade thickness is 4 mm. For a velocity V = 10 m/s, a tip speed ratio (TSR) = 1.58 and 2, the maximum CP values More >
Graphic Abstract
Open Access
ARTICLE
Elena Mosheva1,*, Ivan Krasnyakov2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049146
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract Continuous-flow microchannels are widely employed for synthesizing various materials, including nanoparticles, polymers, and metal-organic frameworks (MOFs), to name a few. Microsystem technology allows precise control over reaction parameters, resulting in purer, more uniform, and structurally stable products due to more effective mass transfer manipulation. However, continuous-flow synthesis processes may be accompanied by the emergence of spatial convective structures initiating convective flows. On the one hand, convection can accelerate reactions by intensifying mass transfer. On the other hand, it may lead to non-uniformity in the final product or defects, especially in MOF microcrystal synthesis. The ability… More >
Graphic Abstract
Open Access
ARTICLE
Bouthaina Debabeche1,2,*, Sonia Cherhabil3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047403
Abstract In this study, the main properties of the hydraulic jump in an asymmetric trapezoidal flume are analyzed experimentally, including the so-called sequent depths, characteristic lengths, and efficiency. In particular, an asymmetric trapezoidal flume with a length of 7 m and a width of 0.304 m is considered, with the bottom of the flume transversely inclined at an angle of m = 0.296 and vertical lateral sides. The corresponding inflow Froude number is allowed to range in the interval (1.40 < F1 < 6.11). The properties of this jump are compared to those of hydraulic jumps More >
Open Access
ARTICLE
Xulei Wu1, Hailong Yu1,*, Panrong Wu1, Chaoqian Wang1, Haiqun Chen1, Yunlan Sun1, He Zheng2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047092
Abstract The development of more environment-friendly ways to dispose of oil sludge is currently regarded as a hot topic. In this context, gasification technologies are generally seen as a promising way to combine oil sludge with coal–water slurry (CWS) and generate resourceful fuel. In this study, a novel five-nozzle gasifier reactor was analyzed by means of a CFD (Computational fluid dynamic) method. Among several influential factors, special attention was paid to the height-to-diameter ratio of the gasifier and the mixing ratio of oil sludge, which are known to have a significant impact on the flow field, More >
Open Access
ARTICLE
Nannan Liu*, Hengchen Qi, Hui Xu, Yanfeng He
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048354
Abstract
Low salinity water containing sulfate ions can significantly alter the surface wettability of carbonate rocks. Nevertheless, the impact of sulfate concentration on the desorption of oil film on the surface of carbonate rock is still unknown. This study examines the variations in the wettability of the surface of carbonate rocks in solutions containing varying amounts of sodium sulfate and pure water. The problem is addressed in the framework of molecular dynamics simulation (Material Studio software) and experiments. The experiment’s findings demonstrate that sodium sulfate can increase the rate at which oil moisture is turned into
More >Open Access
ARTICLE
Dmitry Bratsun*, Natalia Elenskaya, Ramil Siraev, Mikhail Tashkinov
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047928
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract In this work, we numerically study the hydrodynamic permeability of new-generation artificial porous materials
used as scaffolds for cell growth in a perfusion bioreactor. We consider two popular solid matrix designs based on
triply periodic minimal surfaces, the Schwarz P (primitive) and D (diamond) surfaces, which enable the creation
of materials with controlled porosity gradients. The latter property is crucial for regulating the shear stress field in
the pores of the scaffold, which makes it possible to control the intensity of cell growth. The permeability of
functionally graded materials is studied within the framework of… More >
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