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Droplet train impingement tests are generally conducted to mimic droplet-droplet and droplet-substrate interactions in advanced thermal engineering applications. In the presented study, experiments of such a kind are performed considering two target solid surfaces, namely, walls made of aluminium or glass, respectively. The related droplet spreading and splashing trends are investigated with a thermographic camera to shed some light on the thermal behaviours inside and outside of the droplet impact area for surface temperatures ranging between 140°C and 240°C.
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  • Open Access

    ARTICLE

    A Solvation Model for Performance Enhancement of Dye-Sensitized Solar Cells

    Adel Daoud1,2,3,4,*, Ali Cheknane2, Jean Michel Nunzi3,4, Afak Meftah1
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1569-1579, 2022, DOI:10.32604/fdmp.2022.022091
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract A solubility model for Merocyanine-540 dye together with the interface's electron transfer kinetics of MC-540/TiO2 has been investigated (Merocyanine 540-based dye has been used effectively in dye-sensitized solar cells). The highest absorption peaks were recorded at 489 nm and 493 nm in Water and Ethanol solvent, versus the vacuum phase which yielded 495 nm (associated with a modest electron injection-free energy value (ΔGinj) of -2.34 eV for both Water and Ethanol solvents). The time-dependent density functional theory (TD-DFT) method approach has been applied in this simulation. Additionally, the electronic structure and simulated UV-Vis spectra of the dye in different solvents… More >

    Graphic Abstract

    A Solvation Model for Performance Enhancement of Dye-Sensitized Solar Cells

  • Open Access

    ARTICLE

    Characterization of the Omni-Processor Sewage Sludge Ash for Reuse as Construction Material

    Prince Momar Gueye1,2,*, Siham Kamali-Bernard2, Dame Keinde1, Fabrice Bernard2, Vincent Sambou1
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1581-1593, 2022, DOI:10.32604/fdmp.2022.022165
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract Omni Processors (OP) are machines which use sludge as a fuel to generate electricity and clean water, but create ash at the same time. In the present study, fly ash and bottom ash are investigated as materials for potential reuse in the construction field. First, the granular size, density and Blaine finesse are determined. Then, the chemical composition and microstructure are obtained by means of X-ray fluorescence and Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), respectively. Finally, ashes reactivity is determined by two chemical methods (modified Chapelle test, bound water content R3) and a mechanical method (pozzolanic activity index). The characterization… More >

  • Open Access

    ARTICLE

    Elaboration of a Road Material Based on Clayey Soil and Crushed Sand

    H. G. R. Sekloka1,2,*, C. P. Yabi2,3, R. Cloots1, M. Gibigaye2
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1595-1605, 2022, DOI:10.32604/fdmp.2022.022434
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract To contribute to the enhancement of unconventional local materials used for road construction, this study characterizes a crushed sand 0/5, a clayey soil and the litho-stabilized material without and with hydraulic binder and determines their use in accordance with some reference specifications (CEBTP 1984). It is shown that the different components are not usable alone in pavement base. Indeed, the plasticity index obtained for the clayey soil is 21%, a value higher than the imposed standards. In addition, the grading of the 0/5 crushed sand does not fit into the range proposed by CEBTP. A combination of these two (02)… More >

  • Open Access

    ARTICLE

    Feasibility Study for a Hybrid Power Plant (PV-Wind-Diesel-Storage) Connected to the Electricity Grid

    Fahad Maoulida1,2, Kassim Mohamed Aboudou1,2,3,*, Djedjig Rabah2, Mohammed El-Ganaoui2
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1607-1617, 2022, DOI:10.32604/fdmp.2022.023199
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract In this work, we present a feasibility study for a new hybrid power plant (PV-Wind-Diesel-Storage) directly connected to the electrical grid. Several simulations are performed to verify the performance of the hybrid system under different scenarios using real meteorological data. It is shown that the performances of the hybrid system connected to the electrical network depend obviously on the available energy resources and constraints because the renewable energies are intermittent. In addition, the price of the kWh of electricity supplied by the hybrid system is determined, which amounts to $0.209/kWh, which is very cost effective and satisfactory for the considered… More >

    Graphic Abstract

    Feasibility Study for a Hybrid Power Plant (PV-Wind-Diesel-Storage) Connected to the Electricity Grid

  • Open Access

    ARTICLE

    Turbulent Double-Diffusive Natural Convection and Entropy Generation within an Inclined Square Cavity

    Khaled Said*, Ahmed Ouadha, Amina Sabeur
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1619-1629, 2022, DOI:10.32604/fdmp.2022.022220
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract The present study deals with double-diffusive convection within a two-dimensional inclined cavity filled with an air-CO2 binary gas mixture. The left and the right vertical walls are differentially heated and subjected to different locations of (CO2) contaminants to allow for the variation of the buoyancy strength (N). However, the horizontal walls are assumed adiabatic. The simulations are conducted using the finite volume method to solve the conservation equations of continuity, momentum, energy, and species transport. Good agreement with other numerical results in the literature is obtained. The effect of multiple parameters, namely, buoyancy ratio (N), thermal Rayleigh number (Ra), and… More >

  • Open Access

    ARTICLE

    Numerical Simulation of a Granular Flow on a Smooth Inclined Plane

    Rida Tazi1, Adil Echchelh1, Mohammed El Ganaoui2, Aouatif Saad3,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1631-1638, 2022, DOI:10.32604/fdmp.2022.021975
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract Unlike most fluids, granular materials include coexisting solid, liquid or gaseous regions, which produce a rich variety of complex flows. Dense flows of grains driven by gravity down inclines occur in nature and in industrialprocesses. To describe the granular flow on an inclined surface, several studies were carried out. We can cite in particular the description of Saint-Venant which considers a dry granular flow, without cohesion and it only takes into account the substance-substrate friction, this model proposes a simplified form of the granular flow, which depends on the one side on the angle of inclination of the substrate with… More >

  • Open Access

    REVIEW

    Anomaly Detection in Textured Images with a Convolutional Neural Network for Quality Control of Micrometric Woven Meshes

    Pierre-Frédéric Villard1,*, Maureen Boudart2, Ioana Ilea3, Fabien Pierre1
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1639-1648, 2022, DOI:10.32604/fdmp.2022.021726
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract Industrial woven meshes are composed of metal materials and are often used in construction, industrial and residential activities or applications. The objective of this work is defect detection in industrial fabrics in the quality control stage. In order to overcome the limitations of manual methods, which are often tedious and time-consuming, we propose a strategy that can automatically detect defects in micrometric steel meshes by means of a Convolutional Neural Network. The database used for such a purpose comes from real problem data for anomaly detection in micrometric woven meshes. This detection is performed through supervised classification with a Convolutional… More >

  • Open Access

    ARTICLE

    Reinforcement of Clay Soils through Fracture Grouting

    Shaozhen Cheng1,2,3,*, Tielin Chen1, Zizhou Xue3, Kang Zhu3, Jianke Li3
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1649-1665, 2022, DOI:10.32604/fdmp.2022.018789
    (This article belongs to this Special Issue: Advanced Materials, Processing and Testing Technology)
    Abstract Fracture grouting is widely used for building foundation reinforcement, however the underpinning mechanisms are still not clear. Using numerical results about a single-hole fracture grouting process as a basis, a model composed of soil and grouting veins has been created to analyze the reinforcement mechanism. The influence weights of the grouting vein skeleton and compaction effect have been studied, thereby obtaining relevant information on the compressive modulus of the considered composite soil. The research results show that the compaction effect plays a leading role in the soil fracture grouting reinforcement. The grouting pressure, the hardened grouting vein modulus, and the… More >

  • Open Access

    ARTICLE

    An Analysis of the Factors Influencing Cavitation in the Cylinder Liner of a Diesel Engine

    Dehui Tong1,2, Shunshun Qin1,2,*, Quan Liu1,2, Yuhan Li3, Jiewei Lin2,3
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1667-1682, 2022, DOI:10.32604/fdmp.2022.019768
    Abstract Avoiding cavitation inside the water jacket is one of the most important issues regarding the proper design of a diesel engine’s cylinder liner. Using CFD simulations conducted in the frame of a mixture multiphase approach, a moving grid technology and near-wall cavitation model, in the present study the factors and fluid-dynamic patterns that influence cavitation are investigated from both macroscopic and mesoscopic perspectives. Several factors are examined, namely: wall vibration, water jacket width, initial cavitation bubble radius, coolant temperature, and number of bubbles. The results show that reducing the cylinder liner vibration intensity can significantly weaken the cavitation. Similarly, increasing… More >

  • Open Access

    ARTICLE

    An Accurate Dynamic Forecast of Photovoltaic Energy Generation

    Anoir Souissi1,*, Imen Guidara1, Maher Chaabene1, Giuseppe Marco Tina2, Moez Bouchouicha3
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1683-1698, 2022, DOI:10.32604/fdmp.2022.022051
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract The accurate forecast of the photovoltaic generation (PVG) process is essential to develop optimum installation sizing and pragmatic energy planning and management. This paper proposes a PVG forecast model for a PVG/Battery installation. The forecasting strategy is built on a Medium-Term Energy Forecasting (MTEF) approach refined dynamically every hour (Dynamic Medium-Term Energy Forecasting (DMTEF)) and adjusted by means of a Short-Term Energy Forecasting (STEF) strategy. The MTEF predicts the generated energy for a day ahead based on the PVG of the last 15 days. As for STEF, it is a combination between PVG Short-Term (ST) forecasting and DMTEF methods obtained… More >

  • Open Access

    ARTICLE

    A Mathematical Model and a Method for the Calculation of the Downhole Pressure in Composite-Perforation Technological Processes

    Xufeng Li1,2,3, Yantao Bi1,2,3,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1699-1709, 2022, DOI:10.32604/fdmp.2022.019741
    (This article belongs to this Special Issue: Meshless, Mesh-Based and Mesh-Reduction Methods Based Analysis of Fluid Flow in Porous Media)
    Abstract Using the conservation equations for mass, momentum and energy, a model is elaborated to describe the dynamics of high-energy gases in composite-perforation technological processes. The model includes a precise representation of the gunpowder combustion and related killing fluid displacement. Through numerical solution of such equations, the pressure distribution of the high-energy gas in fractures is obtained, and used to determine crack propagation. The accuracy of the model is verified by comparing the simulation results with actual measurements. More >

    Graphic Abstract

    A Mathematical Model and a Method for the Calculation of the Downhole Pressure in Composite-Perforation Technological Processes

  • Open Access

    ARTICLE

    Thermographic Observation of High-Frequency Ethanol Droplet Train Impingement on Heated Aluminum and Glass Surfaces

    Baris Burak Kanbur, Sheng Quan Heng, Fei Duan*
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1711-1718, 2022, DOI: 10.32604/fdmp.2022.021792
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract The present study considers the impingement of a train of ethanol droplets on heated aluminum and glass surfaces. The surface temperature is allowed to vary in the interval 140°C–240°C. Impingement is considered with an inclination of 63 degrees. The droplet diameter is 0.2 mm in both aluminum and glass surface experiments. Thermal gradients are observed with a thermographic camera. It is found that in comparison to glass, the aluminum surface displays very small liquid accumulations and better evaporation performance due to its higher thermal conductivity. The relatively low thermal conductivity of glass results in higher thermal gradients on the surface.… More >

    Graphic Abstract

    Thermographic Observation of High-Frequency Ethanol Droplet Train Impingement on Heated Aluminum and Glass Surfaces

  • Open Access

    ARTICLE

    Determination of the Cement Sheath Interface and the Causes of Failure in the Completion Stage of Gas Wells

    Xuesong Xing1, Renjun Xie1, Yi Wu1, Zhiqiang Wu1, Huanqiang Yang2,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1719-1735, 2022, DOI:10.32604/fdmp.2022.019799
    (This article belongs to this Special Issue: Meshless, Mesh-Based and Mesh-Reduction Methods Based Analysis of Fluid Flow in Porous Media)
    Abstract

    The bonding quality of the cement sheath interface decreases during well completion because of the change in the casing pressure. To explore the root cause of such phenomena, experiments on the mechanical properties and interface bonding strength of a cement sheath have been carried out taking the LS25-1 high-temperature and high-pressure (HTHP) gas field as an example. Moreover, a constitutive model of the cement sheath has been defined and verified both by means of a full-scale HTHP cement sheath sealing integrity evaluation experiment and three-dimensional finite element simulations. The results show that the low initial cementing surface strength is the… More >

  • Open Access

    ARTICLE

    Modeling the Unsteady Flow of a Newtonian Fluid Originating from the Hole of an Open Cylindrical Reservoir

    Andrianantenaina Marcelin Hajamalala1,*, Ratovonarivo Noarijaona1, Zeghmati Belkacem2
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1737-1748, 2022, DOI:10.32604/fdmp.2022.022047
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract This work deals with the modeling of the unsteady Newtonian fluid flow associated with an open cylindrical reservoir. This reservoir presents a hole on the right bottom wall. Fluid volume variation, heat and mass transfers are neglected. The unsteady governing equations are based on the conservation of mass and momentum. A finite volume technique is used to solve the non-dimensional equations and related boundary conditions. The algebraic system of equations resulting from the discretization process are solved by means of the THOMAS algorithm. For pressure-velocity coupling, the SIMPLE algorithm (Semi Implicit Method for Pressure Linked Equations) is used. Results for… More >

  • Open Access

    ARTICLE

    The Effect of Swirl Intensity on the Flow Behavior and Combustion Characteristics of a Lean Propane-Air Flame

    Hemaizia Abdelkader*, Bentebbiche Abdelhalim
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1749-1762, 2022, DOI:10.32604/fdmp.2022.022006
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract The effect of swirl number (Sn) on the flow behavior and combustion characteristics of a lean premixed propane Flame Ф = 0.5 in a swirl burner configuration was numerically verified in this study. Two-dimensional numerical simulations were performed using ANSYS-Fluent software. For turbulence closure, a standard K-ε turbulence model was applied. The turbulence-chemistry interaction scheme was modeled using the Finite Rate-Eddy Dissipation hybrid model (FR/EDM) with a reduced three-step reaction mechanism. The P1 radiation model was used for the flame radiation inside the combustion chamber. Four different swirl numbers were selected (0, 0.72, 1.05, and 1.4) corresponding to different angles… More >

  • Open Access

    ARTICLE

    Tuning the Spatially Controlled Growth, Structural Self-Organizing and Cluster-Assembling of the Carbyne-Enriched Nano-Matrix during Ion-Assisted Pulse-Plasma Deposition

    Alexander Lukin1,*, Oğuz Gülseren2
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1763-1779, 2022, DOI:10.32604/fdmp.2022.022016
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract Carbyne-enriched nanomaterials are of current interest in nanotechnology-related applications. The properties of these nanomaterials greatly depend on their production process. In particular, structural self-organization and auto-synchronization of nanostructures are typical phenomena observed during the growth and heteroatom-doping of carbyne-enriched nanostructured metamaterials by the ion-assisted pulse-plasma deposition method. Accordingly, fine tuning of these processes may be seen as the key step to the predictive designing of carbyne-enriched nano-matrices with improved properties. In particular, we propose an innovative concept, connected with application of the vibrational-acoustic effects and based on universal Cymatics mechanisms. These effects are used to induce vibration-assisted self-organized wave patterns… More >

  • Open Access

    ARTICLE

    A Method for Identifying Channeling Paths in Low-Permeability Fractured Reservoirs

    Zhenfeng Zhao1, Bin Li1, Zubo Su1, Lijing Chang1, Hongzheng Zhu1, Ming Liu1, Jialing Ma2,*, Fan Wang1, Qianwan Li1
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1781-1794, 2022, DOI:10.32604/fdmp.2022.019998
    (This article belongs to this Special Issue: Meshless, Mesh-Based and Mesh-Reduction Methods Based Analysis of Fluid Flow in Porous Media)
    Abstract Often oilfield fractured horizontal wells produce water flowing in multiple directions. In this study, a method to identify such channeling paths is developed. The dual-medium model is based on the principle of inter-well connectivity and considers the flow characteristics and related channeling terms. The Lorentz curve is drawn to qualitatively discern the geological type of the low-permeability fractured reservoir and determine the channeling direction and size. The practical application of such an approach to a sample oilfield shows that it can accurately identify the channeling paths of the considered low-permeability fractured reservoir and predict production performances according to the inter-well… More >

  • Open Access

    ARTICLE

    Simulation of Oil-Water Flow in a Shale Reservoir Using a Radial Basis Function

    Zenglin Wang1, Liaoyuan Zhang1, Anhai Zhong2, Ran Ding2, Mingjing Lu2,3,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1795-1804, 2022, DOI:10.32604/fdmp.2022.020020
    (This article belongs to this Special Issue: Meshless, Mesh-Based and Mesh-Reduction Methods Based Analysis of Fluid Flow in Porous Media)
    Abstract Due to the difficulties associated with preprocessing activities and poor grid convergence when simulating shale reservoirs in the context of traditional grid methods, in this study an innovative two-phase oil-water seepage model is elaborated. The modes is based on the radial basis meshless approach and is used to determine the pressure and water saturation in a sample reservoir. Two-dimensional examples demonstrate that, when compared to the finite difference method, the radial basis function method produces less errors and is more accurate in predicting daily oil production. The radial basis function and finite difference methods provide errors of 5.78 percent and… More >

  • Open Access

    ARTICLE

    Comparative Analysis of the Measured and Simulated Performances of a Grid-Connected Photovoltaic Power Plant

    Mourad Benfares*, Sanae Janati Edrissi, Mohammed Benbrahim, Izeddine Zorkani, Anouar Jorio, Ali Didi Seddik
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1805-1813, 2022, DOI:10.32604/fdmp.2022.022095
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract The present study comparing actual data and simulated parameters was carried out using the PVsyst software for a 5.94 KWp grid-connected photovoltaic system, consisting of three types of mono-Si (2.04 KWp), poly-Si (2.04 KWp) and amorphous-Si (1.86 KWp) photovoltaic panels and a weather station. The research is based on data collected for one year (2020) of energy production Simulations were performed using long-term meteorological data generated by NASA and on-site measurement. A comparison of evaluated monthly and annually performance elements has also been considered: Eac, PR, FC. As shown by the results, each photovoltaic technology has certain advantages in different… More >

  • Open Access

    ARTICLE

    Experimental Study and Numerical Simulation of Polymer Flooding

    Lei Bai1,2, Kai Li1,2,*, Ke Zhou3, Qingshan Wan1,2, Pengchao Sun1,2, Gaoming Yu3, Xiankang Xin3
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1815-1826, 2022, DOI:10.32604/fdmp.2022.020271
    (This article belongs to this Special Issue: Meshless, Mesh-Based and Mesh-Reduction Methods Based Analysis of Fluid Flow in Porous Media)
    Abstract The numerical simulation of polymer flooding is a complex task as this process involves complex physical and chemical reactions, and multiple sets of characteristic parameters are required to properly set the simulation. At present, such characteristic parameters are mainly obtained by empirical methods, which typically result in relatively large errors. By analyzing experimentally polymer adsorption, permeability decline, inaccessible pore volume, viscosity-concentration relationship, and rheology, in this study, a conversion equation is provided to convert the experimental data into the parameters needed for the numerical simulation. Some examples are provided to demonstrate the reliability of the proposed approach. More >

    Graphic Abstract

    Experimental Study and Numerical Simulation of Polymer Flooding

  • Open Access

    ARTICLE

    Optimization of the Thermoelectric Performances of CoSbS Semiconductors Using the High-Pressure Fabrication Method

    Fang Liu1, Yonghui You2, Min Wang1,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1827-1839, 2022, DOI:10.32604/fdmp.2022.019132
    (This article belongs to this Special Issue: Advanced Materials, Processing and Testing Technology)
    Abstract CoSbS-based compounds are good thermoelectric materials with low thermal conductivity and good electrical properties, which can effectively be used to improve the efficiency of many thermoelectric conversion processes. In order to improve their properties even more, in this study a series of experiments have been conducted in the frame of the traditional solid-phase synthesis and high-pressure method. It is shown that if the mass fluctuation and stress fluctuation in the considered CoSbS system increase, the scattering probability of phonons is enhanced and the lattice thermal conductivity of the material is reduced. Adding a small amount of Se can simultaneously optimize… More >

  • Open Access

    ARTICLE

    Optimal Experiment Design for the Identification of the Interfacial Heat Transfer Coefficient in Sand Casting

    Dorsaf Khalifa*, Foued Mzali
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1841-1852, 2022, DOI:10.32604/fdmp.2022.022060
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract The interfacial heat transfer coefficient (IHTC) is one of the main input parameters required by casting simulation software. It plays an important role in the accurate modeling of the solidification process. However, its value is not easily identifiable by means of experimental methods requiring temperature measurements during the solidification process itself. For these reasons, an optimal experiment design was performed in this study to determine the optimal position for the temperature measurement and the optimal thickness of the rectangular cast iron part. This parameter was identified using an inverse technique. In particular, two different algorithms were used: Levenberg Marquard (LM)… More >

  • Open Access

    ARTICLE

    Thermomechanical Characterization of a Bio-Sourced Material Based on Clay and Alfa Fibers

    Sara Ibn-Elhaj1,*, Yassine Elhamdouni1, Soumia Mounir1,2, Abdelhamid Khabbazi1
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1853-1863, 2022, DOI:10.32604/fdmp.2022.022531
    (This article belongs to this Special Issue: Materials and Energy an Updated Image for 2021)
    Abstract Bio-based materials are of great interest owing to their abundance and the immense potential they display as an ideal alternative to widely used industrial construction materials (that directly and indirectly harm the environment). In this scope, an in-depth experimental study is presented here on clay-based materials aimed to enhance their properties through the addition of other bio-based components such as fibers, in the present case alfa fiber. The thermal conductivity and mechanical properties (compressive and flexural tensile strengths) of the composite clay-alfa material are analyzed with the percentage of alfa fiber in the matrix ranging from 0% to 4%. It… More >

  • Open Access

    ARTICLE

    Managed Pressure Drilling Technology: A Research on the Formation Adaptability

    Chenglong Wang1, Hexing Liu1, Yaya Liu1, Xi Xia2, Fan Xiao3,*, Ningyu Zheng3
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1865-1875, 2022, DOI: 10.32604/fdmp.2022.021668
    (This article belongs to this Special Issue: Dynamics and Materials Processing in Petroleum Engineering)
    Abstract Existing pressure drilling technologies are based on different principles and display distinct characteristics in terms of control pressure and degree of formation adaptability. In the present study, the constant-bottom-hole-pressure (CBHP) and controlled-mud-level (CML) dual gradient drilling methods are considered. Models for the equivalent circulating density (ECD) are introduced for both drilling methods, taking into account the control pressure parameters (wellhead back pressure, displacement, mud level, etc.) and the relationship between the equivalent circulating density curve in the wellbore and two different types of pressure profiles in deep-water areas. The findings suggest that the main pressure control parameter for CBHP drilling… More >

  • Open Access

    ARTICLE

    Numerical Analysis of a Microjet-Based Method for Active Flow Control in Convergent-Divergent Nozzles with a Sudden Expansion

    Abdul Aabid1,*, Sher Afghan Khan2, Muneer Baig1
    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1877-1900, 2022, DOI:10.32604/fdmp.2022.021860
    (This article belongs to this Special Issue: Materials, Energy, and Fluid Dynamics)
    Abstract A method based on microjets is implemented to control the flow properties in a convergent-divergent nozzle undergoing a sudden expansion. Three different variants of this active control technique are explored numerically by means of a finite-volume method for compressible fluid flow: with the first one, the control is implemented at the base, with the second at the wall, while the third one may be regarded as a combination of these. When jets are over-expanded, the control is not very effective. However, when a favourable pressure gradient is established in the nozzle, the control becomes effective, leading to an increase in… More >

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