Open Access
ARTICLE
Alexey Vjatkin*, Svyatoslav Petukhov, Victor Kozlov
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.062535
（This article belongs to the Special Issue: Non-Equilibrium Processes in Continuous Media)
Abstract Time-averaged thermal convection in a rotating horizontal annulus with a higher temperature at its inner boundary is studied. The centrifugal force plays a stabilizing role, while thermal convection is determined by the “thermovibrational mechanism”. Convective flow is excited due to oscillations of a non-isothermal rotating fluid. Thermal vibrational convection manifests in the form of two-dimensional vortices elongated along the axis of rotation, which develop in a threshold manner with an increase in the amplitude of fluid oscillations. The objective of the present study is to clarify the nature of another phenomenon, i.e., three-dimensional convective vortices… More >
Open Access
ARTICLE
Zhi Yang1,2, Xiaohui Zhang1,2,*, Xinting Tong3, Yutang Zhao4, Teng Xia1,2, Hua Wang1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061737
Abstract In bottom-blown copper smelting processes, oxygen-enriched air is typically injected into the melt through a lance, generating bubbles that ascend and agitate the melt, enhancing mass, momentum, and heat transfer within the furnace. The melt’s viscosity, which varies across reaction stages, and the operating conditions influence bubble size and dynamics. This study investigates the interplay between melt viscosity and bubble diameter on bubble motion using numerical simulations and experiments. In particular, the volume of fluid (VOF) method and Ω-identification technique were employed to analyze bubble velocity, deformation, trajectories, and wake characteristics. The results showed that More >
Open Access
ARTICLE
Kirill Rysin*, Alexey Vjatkin, Victor Kozlov
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061722
（This article belongs to the Special Issue: Non-Equilibrium Processes in Continuous Media)
Abstract Thermal vibrational convection (TVC) refers to the time-averaged convection of a non-isothermal fluid subjected to oscillating force fields. It serves as an effective mechanism for heat transfer control, particularly under microgravity conditions. A key challenge in this field is understanding the effect of rotation on TVC, as fluid oscillations in rotating systems exhibit unique and specific characteristics. In this study, we examine TVC in a vertical flat layer with boundaries at different temperatures, rotating around a horizontal axis. The distinctive feature of this study is that the fluid oscillations within the cavity are not induced… More >
Open Access
ARTICLE
Veronika Dyakova1,2,*, Olga Vlasova1, Victor Kozlov1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060577
（This article belongs to the Special Issue: Non-Equilibrium Processes in Continuous Media)
Abstract An experimental investigation of the dynamics of the interface between two low-viscosity fluids with high density contrast oscillating in a fixed vertical slotted channel has been conducted. It has been found that as the amplitude of the liquid column oscillations increases, parametric oscillations of the interface are excited in the form of a standing wave located in the channel plane. In particular, depending on the interfacial tension, the standing waves have a frequency equal to that of liquid piston oscillations (harmonic response), or half of the frequency of oscillations of the liquid column in the… More >
Open Access
ARTICLE
Ivan Karpunin*, Denis Polezhaev
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061163
（This article belongs to the Special Issue: Non-Equilibrium Processes in Continuous Media)
Abstract An experimental study of the diffusive mass transfer between a droplet and an oscillating immiscible liquid in a horizontal axisymmetric Hele-Shaw cell is carried out. The liquid oscillates radially in the cell. The transverse size of the droplet exceeds the cell thickness. The viscosities of the droplet and the surrounding liquid are comparable. Relevant effort is provided to design and test an experimental setup and validate a protocol for determining the mass transfer rate of a solute in a two-liquid system. In particular, fluorescent dye Rhodamine B is considered as the solute. A critical comparison… More >
Open Access
ARTICLE
Zhengyang Zhang1,2, Jing Sun1,2,*, Xin Shi3, Dehua Liu1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060393
Abstract High saturation pressure reservoirs experience rapid pressure decline during exploitation, leading to significant changes in crude oil phase behavior and a continuous increase in viscosity after degassing, which adversely affects oil recovery. This challenge is particularly acute in tight sandstone reservoirs. To optimize the development strategy for such reservoirs, a series of experiments were conducted using core samples from a high saturation tight sandstone reservoir in the JS oilfield. Gas-dissolved crude oil was prepared by mixing wellhead oil and gas samples, enabling the identification of the critical point where viscosity changes as pressure decreases. Oil-water… More >
Open Access
ARTICLE
Yangyang Cao, Jiye Zhang*, Jiawei Shi, Yao Zhang
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060429
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract The pantograph area is a critical source of aerodynamic noise in high-speed trains, generating noise both directly and through its cavity, a factor that warrants considerable attention. One effective method for reducing aerodynamic noise within the pantograph cavity involves the introduction of a jet at the leading edge of the cavity. This study investigates the mechanisms driving cavity aerodynamic noise under varying jet velocities, using Improved Delayed Detached Eddy Simulation (IDDES) and Ffowcs Williams-Hawkings (FW-H) equations. The numerical simulations reveal that an increase in jet velocity results in a higher elevation of the shear layer… More >
Open Access
ARTICLE
Yu Zhang1, Shang-Zhen Yu2, Jia-Jia Yu2,3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.057804
Abstract
RP-3 is a kind of aviation kerosene commonly used in hypersonic and scramjet engines due to its superior thermal stability, high energy density, and ability to act as a coolant before combustion. However, it is known that coke can be generated during the cooling process as a carbonaceous deposition on metal walls and its effects on the cooling performance are still largely unknown. To explore the influence mechanism of porous coke on heat transfer characteristics of supercritical RP-3 in the regenerative cooling channel, a series of computational simulations were conducted via a three-dimensional CFD… More >
Open Access
ARTICLE
Shiyao Peng1, Hanwen Zhang1, Chong Chai1, Shilong Xue2, Xiaobin Zhang2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060452
Abstract The diffusion of hydrogen-blended natural gas (HBNG) from buried pipelines in the event of a leak is typically influenced by soil properties, including porosity, particle size, temperature distribution, relative humidity, and the depth of the pipeline. This study models the soil as an isotropic porous medium and employs a CFD-based numerical framework to simulate gas propagation, accounting for the coupled effects of soil temperature and humidity. The model is rigorously validated against experimental data on natural gas diffusion in soil. It is then used to explore the impact of relevant parameters on the diffusion behavior… More >
Open Access
ARTICLE
Li Wang1, Haipeng Mu1, Jiming Zhu2,*, Zhongchang Wang3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.057931
Abstract
To elucidate the relationship between pipeline erosion and wear during slurry transportation, this study considers three key influencing parameters, namely, the ratio of inlet to outlet pipe diameter, the length of the variable diameter section, and the roughness of the pipe wall. The impact of these factors on pipeline erosion and wear is analyzed using a single-factor analysis approach. In particular, the Fluent software is employed to conduct the required numerical simulations for variable diameter elbows of varying morphologies. The results indicate that as the inlet to outlet diameter ratio increases, the wear on… More >
Open Access
ARTICLE
Shuxun Li1,2, Jianwei Wang1,2,*, Tingjin Ma1, Guolong Deng1,2, Wei Li1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.059570
Abstract
In photothermal power (solar energy) generation systems, purging residual molten salt from pipelines using high-pressure gas poses a significant challenge, particularly in clearing the bottom of regulating valves. Ineffective purging can lead to crystallization of the molten salt, resulting in blockages. To address this issue, understanding the gas-liquid two-phase flow dynamics during high-pressure gas purging is crucial. This study utilizes the Volume of Fluid (VOF) model and adaptive dynamic grids to simulate the gas-liquid two-phase flow during the purging process in a DN50 PN50 conventional molten salt regulating valve. Initially, the reliability of the… More >
Open Access
ARTICLE
Aihua Tao1, Chao Li1, Zhijun Jie1, Yong Zhang1, Xing Chen1, Weili Liu2,3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.059545
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract Hydraulic sandblasting perforation plays a crucial role in the fracturing and reconstruction of unconventional oil and gas reservoirs. The jet nozzle is an essential part of the hydraulic perforation tool. Insufficient penetration depth, caused by excessive jet distances, presents challenges during the perforation process. To overcome this, an optimization design of the nozzle structure is required to enhance the perforation efficiency. In this paper, a computational fluid-dynamic model for conical-cylindrical nozzles has been elaborated. To further improve the rock-breaking efficiency of the jet nozzle, a fillet design is introduced at the nozzle inlet section. The… More >
Open Access
ARTICLE
Anqi Du1,*, Ming Wen2, Jian Yang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.058553
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract Horizontal wells play a crucial role in enhancing shale gas reservoir production. This study employs transient multiphase simulation to investigate the impact of well trajectory on production optimization throughout a well’s life cycle. The research uses OLGATM as a simulator to examine six well trajectories: toe-up, toe-down, smooth horizontal, undulated toe-up, undulated toe-down, and undulated horizontal. Initial findings indicate comparable production rates across different trajectories during the early production phase, with toe-up wells showing slightly better performances due to minimal slugging. However, as the reservoir pressure decreases, the well trajectory significantly influences production. Horizontal wells achieve More >
Open Access
ARTICLE
Liang Ai1, Mingyue Li2, Lumin Chen1, Yihua Gao2, Yi Sun1, Yue Wu1, Fuping Qian1,*, Jinli Lu2, Naijin Huang3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.055985
Abstract
In this study, Computational Fluid Dynamics (CFD) together with a component transport model are exploited to investigate the influence of dimensionless parameters, involving the height of the rectifier grid and the installation height of the first catalyst layer, on the flow field and the overall denitration efficiency of a cement kiln’s SCR (Selective catalytic reduction) denitrification reactor. It is shown that accurate numerical results can be obtained by fitting the particle size distribution function to the actual cement kiln fly ash and implementing a non-uniform particle inlet boundary condition. The relative error between denitration More >
Open Access
ARTICLE
Yuliang Zhang1,2,*, Zezhou Yang1, Lianghuai Tong3,*, Yanjuan Zhao4, Xiaoqi Jia5, Anda Han6
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.059903
Abstract
This paper investigates the start-up and shutdown phases of a five-bladed closed-impeller centrifugal pump through experimental analysis, capturing the temporal evolution of its hydraulic performances. The study also predicts the transient characteristics of the pump under non-rated operating conditions to assess the accuracy of various machine learning methods in forecasting its instantaneous performance. Results indicate that the pump’s transient behavior in power-frequency mode markedly differs from that in frequency-conversion mode. Specifically, the power-frequency mode achieves steady-state values faster and exhibits smaller fluctuations before stabilization compared to the other mode. During the start-up phase, as… More >
Open Access
ARTICLE
Zhengjing Shen1,2,*, Fanqiang Kong1, Yu Liu1, Jilai Zeng1, Wengang Yang1, Jiangbo Wu1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.058727
（This article belongs to the Special Issue: Multiphase Flow and Vortex Dynamics in Fluid Machinery)
Abstract Erosion in slurry pumps presents a persistent challenge in industrial applications. This study examines the erosion of the static components of a 150ZJ-C42 centrifugal slurry pump, currently in operation at a beneficiation plant, under varying particle conditions. Utilizing high-precision three-dimensional reverse engineering, the pump’s flow passage geometry was reconstructed to facilitate detailed erosion analysis. Focusing on the front and rear baffles of the pump chamber, as well as the volute, erosion patterns were analyzed for different particle volume concentrations and sizes. The results reveal that the highest erosion damage consistently occurs near the volute tongue,… More >
Open Access
ARTICLE
Sheng Ju, Jie Liu*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.057535
Abstract
As shale gas technology has advanced, the horizontal well fracturing model has seen widespread use, leading to substantial improvements in industrial gas output from shale gas wells. Nevertheless, a swift decline in the productivity of individual wells remains a challenge that must be addressed throughout the development process. In this study, gas wells with two different wellbore trajectory structures are considered, and the OLGA software is exploited to perform transient calculations on various tubing depth models. The results can be articulated as follows. In terms of flow patterns: for the deep well A1 (upward-buckled), slug… More >
Open Access
ARTICLE
Dongwei Wang1,*, Wensheng Ma2, Weiguo Zhao1, Rui Cao2, Youchao Yang2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055220
Abstract Cavitation is an unavoidable phenomenon in the operation of centrifugal pumps. Prolonged cavitation can cause significant damage to the components of the flow channel, and in severe cases, it may even interfere with the normal energy exchange processes within the pump. Therefore, effective monitoring of cavitation in centrifugal pumps is crucial. This article presents a study that approaches the issue from an acoustic perspective, using experimental methods to gather and analyze acoustic data at the inlet and outlet of centrifugal pumps across various flow rates, with hydrophones as the primary measuring instruments. Results show that… More >
Open Access
ARTICLE
Zhuang Liu1,*, Tingen Fan1, Qianli Lu2, Jianchun Guo2, Renfeng Yang1, Haifeng Wang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056729
Abstract
Thermal shock damage in deep shale hydraulic fracturing can impact fracture propagation behaviors, potentially leading to the formation of complex fractures and enhancing gas recovery. This study introduces a thermal-hydraulic-mechnical (THM) coupled fracture propagation model relying on the phase field method to simulate thermal shock-induced fracturing in the deep shale considering dynamic temperature conditions. The validity of this model is confirmed through comparison of experimental and numerical results concerning the THM-coupled stress field and thermal cracking. Special attention is paid to the interaction of thermal shock-induced fractures in deep shale that contains weak planes. More >
Open Access
ARTICLE
Tianpeng Li1,*, Yujun Duan2, Qianghu Ji3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.053862
Abstract
A centrifugal pump with a specific speed ns = 67 is considered in this study to investigate the impact of blade cutting (at the outlet edge) on the fluid-induced noise, while keeping all the other geometric parameters unchanged. The required unsteady numerical calculations are conducted by applying the RNG k-ε turbulence model with the volute dipole being used as the sound source. The results indicate that the internal pressure energy of the centrifugal pump essentially depends on the blade passing frequency and its low-frequency harmonic frequency. Moreover, the pressure pulsation distribution directly affects the noise More >
Open Access
ARTICLE
Wei Dong1,2,3,4, Fuping Qian5,*, Gang Li1,*, Shi’an Zhou5, Lei Ding2,4, Qingda Gao5, Xuemin Zeng1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056060
Abstract Nitrogen oxides (NOx) and particulate matter (PM) present significant risks to both human health and environmental sustainability. The Integrated Dust Removal and Denitrification Technology (DRDt) offers a more efficient and cost-effective solution for achieving ultralow industrial flue gas emissions; however, its effectiveness is undermined by low catalyst load rates and poor stability in filter materials. This study addresses these limitations by modifying conventional PTFE filter media (PTFE-Tim) through the incorporation of sodium alginate (SA) and dopamine (DA) as modifiers, resulting in two new filter materials: PTFE–SA–MOF and PTFE–DA–MOF. By optimizing the parameters of an orthogonal experimental… More >
Open Access
ARTICLE
Baoli Zang1, Liyang Shao1, Yang Li1, Hao Ran2, Liangwen Wei2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.054275
Abstract This study focuses on addressing ventilation and dust removal challenges during the construction of small-section tunnels using drilling and blasting techniques. Specifically, the research examines the shale gas gathering and transmission trunk line project in the Weiyuan and Luzhou blocks. To gain deeper insights into dust migration patterns, numerical simulations were conducted. The study further analyzed dust migration behavior in small-section tunnels and large steep-sloped shafts, taking into account various factors such as ventilation distance, tunnel slope, and section size. The results indicate that optimal ventilation occurs at distances of 15 and 13 m. Additionally, More >
Open Access
ARTICLE
Min Feng*, Long Wang, Lei Sun, Bo Yang, Wei Wang, Jianning Luo, Yan Wang, Ping Liu
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056421
Abstract This study sheds light on how pore structure characteristics and varying dynamic pressure conditions influence the permeability of tight sandstone reservoirs, with a particular focus on the Paleozoic reservoirs in the Qingshimao Gas Field. Using CT scans of natural core samples, a three-dimensional digital core was constructed. The maximum ball method was applied to extract a related pore network model, and the pore structure characteristics of the core samples, such as pore radius, throat radius, pore volume, and coordination number, were quantitatively evaluated. The analysis revealed a normally distributed pore radius, suggesting a high degree… More >
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