Home / Journals / FDMP / Vol.17, No.3, 2021
Table of Content
  • Open Access

    ARTICLE

    A Combined Numerical-Experimental Study on the Noise Power Spectrum Produced by an Electromagnetic Sensor for Slurry Flow

    Song Gao1,*, Xin Jin1, Qiaohong Liu2
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 511-529, 2021, DOI:10.32604/fdmp.2021.012741
    Abstract The signals generated by electromagnetic flow sensors used for slurry fluids are often affected by noise interference produced by interaction with the slurry itself. In this study, the power spectrum characteristics of the signal are studied, and an attempt is made to determine the relationship between the characteristics of the related noise and the velocity and concentration of the slurry fluid. Dedicated experiments are conducted and the related power spectrum curve is obtained processing the signal measured by the sensor with Matlab. Numerical simulations are also carried out in the frame of an Eulerian approach in order get additional insights… More >

  • Open Access

    ARTICLE

    Fluid-Structure Interaction in Problems of Patient Specific Transcatheter Aortic Valve Implantation with and Without Paravalvular Leakage Complication

    Adi Azriff Basri1,6,*, Mohammad Zuber2, Ernnie Illyani Basri1, Muhammad Shukri Zakaria5, Ahmad Fazli Abd Aziz3, Masaaki Tamagawa4, Kamarul Arifin Ahmad1,6
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 531-553, 2021, DOI:10.32604/fdmp.2021.010925
    (This article belongs to this Special Issue: Fluid Structure Interaction in Various Engineering Field)
    Abstract Paravalvular Leakage (PVL) has been recognized as one of the most dangerous complications in relation to Transcathether Aortic Valve Implantation (TAVI) activities. However, data available in the literature about Fluid Structure Interaction (FSI) for this specific problem are relatively limited. In the present study, the fluid and structure responses of the hemodynamics along the patient aorta model and the aortic wall deformation are studied with the aid of numerical simulation taking into account PVL and 100% TAVI valve opening. In particular, the aorta without valve (AWoV) is assumed as the normal condition, whereas an aorta with TAVI 26 mm for… More >

  • Open Access

    ARTICLE

    Influence of the Hook Position on the Vertical Vibrations of an Automobile Exhaust System: Application of the Robust Optimization Design

    Jianqiang Xiong*
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 555-567, 2021, DOI:10.32604/fdmp.2021.015429
    Abstract A robust optimization design method is proposed to investigate the influence of the hook position on the vertical vibration (bending) of an automobile exhaust system. A block diagram for the robustness analysis of the exhaust system is initially constructed from the major affecting factors. Secondly, the second-order inertia force is set as the vibration excitation source of the exhaust system and the displacement of four hooks of the exhaust system is selected as the variable factor. Then tests are carried out to investigate the resulting vertical bending considering four influencing factors and three levels of analysis. Finally, a variance analysis… More >

  • Open Access

    ARTICLE

    Influence of Nozzle Orifice Shape on the Atomization Process of Si3N4 in a Dry Granulation Process

    Dongling Yu1, Huiling Zhang1, Xu Zeng1, Dahai Liao1,*, Nanxing Wu2,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 569-586, 2021, DOI:10.32604/fdmp.2021.014711
    Abstract In order to reveal the intrinsic fluid-dynamic mechanisms of a pressure-swirl nozzle used for Si3N4 dry granulation, and effectively predict its external spray characteristics, the dynamics of air-atomized liquid two-phase flow is analyzed using a VOF (Volume of Fraction) method together with the modified realizable k-ε turbulence model. The influence of nozzle orifice shape on velocity distribution, pressure distribution is studied. The results show that the pressure difference in a convergent conical nozzle is the largest with a hollow air core being formed in the nozzle. The corresponding velocity of atomized liquid at nozzle orifice is the largest. Using a… More >

  • Open Access

    ARTICLE

    Experimental Analysis of a Pneumatic Drop-on-Demand (DOD) Injection Technology for 3D Printing Using a Gallium-Indium Alloy

    Yanpu Chao1, Hao Yi2,3,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 587-595, 2021, DOI:10.32604/fdmp.2021.015478
    Abstract Many liquid metals have a high boiling point, strong electrical conductivity, high thermal conductivity, and non-toxic properties, which make them ideal targets for applications in different fields such as optics, microcircuits, electronic switches, micro-electromechanical System (MEMS) devices and 3D printing manufacturing. However, owing to the generally high surface tension of these liquids, achieving uniform micro-droplets is often a challenge due to the inherent difficulties in controlling their size and shape. In this study, a gallium indium alloy (GaIn24.5) has been used in combination with a pneumatic drop-on-demand (DOD) injection technology to carry out a series of experiments. The micro-droplet forming… More >

  • Open Access

    ARTICLE

    A CFD Study on a Biomimetic Flexible Two-body System

    Jianxin Hu, Xin Huang, Yuzhen Jin*
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 597-614, 2021, DOI:10.32604/fdmp.2021.014249
    Abstract By studying the characteristics of the flow field around a swimming fish, useful insights can be obtained into the superior swimming capabilities developed by nature over millions of years, in comparison to what can be achieved using the standard engineering principles traditionally employed in naval and ocean engineering. In the present study, the flow field related to a single joint fish model is simulated in the framework of a commercial computational fluid dynamics software (ANSYS Fluent 18.0). The principle of the anti-Kármán vortex street is analyzed and the relationship between the direction of the tail vortex and the direction of… More >

  • Open Access

    ARTICLE

    Numerical Investigation on the Secondary Flow Control by Using Splitters at Different Positions with Respect to the Main Blade

    Tao Bian1, Xin Shen2, Jun Feng1, Bing Wang1,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 615-628, 2021, DOI:10.32604/fdmp.2021.014902
    Abstract In turbomachinery, strong secondary flow can produce significant losses of total pressure near the endwall and reduce the efficiency of the considered turbomachine. In this study, splitters located at different positions with respect to the main blade have been used to reduce such losses and improve the efficiency of the outlet guide vane (OGV). Three different relative positions have been considered assuming a NACA 65-010 profile for both the main blade and the splitter. The numerical results indicate that splitters can effectively reduce the total pressure loss by suppressing the secondary flow around the main blade, but the splitters themselves… More >

  • Open Access

    ARTICLE

    Preparation and Characterization of Electrospun Polylactic Acid Micro/Nanofibers under Different Solvent Conditions

    Hao Dou1,2,*, Hongxia Liu1,2, Feng Wang1,2, Yanli Sun1,2
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 629-638, 2021, DOI:10.32604/fdmp.2021.015612
    (This article belongs to this Special Issue: Nanoscale Flow and Nanomaterial Fabrication)
    Abstract Electrospinning is a versatile and popular method for the fabrication of ultrafine fibers and many parameters in electrospinning can be adjusted when ideal micro/nanofibers are required. In particular, the selection of a proper solvent condition is a fundamental and crucial step to produce electrospun ultrafine fibers. In this study, a commonly used biomaterial, polylactic acid (PLA), was dissolved in 7 different solvents and PLA micro/nanofibers were prepared by electrospinning. The morphology, porosity, mechanical property and static contact angle were characterized to determine the quality of the obtained product. The results show that different solvent conditions have a significant effect on… More >

  • Open Access

    ARTICLE

    A Computational Study on the Effect of Bifurcation Lesions with Different Structures on Blood Velocity and Temperature

    Haoyu Wan, Heng Zhang, Zhizhu He*
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 639-651, 2021, DOI:10.32604/fdmp.2021.012106
    (This article belongs to this Special Issue: Bioheat Transfer in Micro and Macro Scales)
    Abstract Treating coronary bifurcation stenosis is still a challenging task. Existing procedures still display a relatively small rate of success. This paper aims to investigate numerically the effect of bifurcation lesions with different structures on the dynamics of blood flow and related temperature. The problem geometry is parametrically varied by changing the bifurcation angle and radius. A finite volume method is used to simulate the three-dimensional flow. The effects induced by the structure of the stenosis, the artery bifurcation angle and radius, and the inlet velocity of blood are discussed in terms of flow pattern, pressure distribution, and shear stress at… More >

  • Open Access

    ARTICLE

    Numerical Simulation of U-Shaped Metal Rings in a Wind-Sand Environment

    Songchen Wang, Xinmei Li*, Cheng Chai, Gen Wang, Caibin Lu
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 653-666, 2021, DOI:10.32604/fdmp.2021.015127
    (This article belongs to this Special Issue: Turbulence and Environmental Fluids)
    Abstract The interaction of U-shaped rings used for power transmission hardware with a wind-sand field is simulated numerically. A standard turbulence model is used in synergy with an Eulerian-Lagrangian approach. The results show that the wind pressure on the windward side of the U-shaped ring is the highest, a negative pressure zone appears on both sides of the U-shaped ring, while a Kármán Vortex Street is created on its leeward side. There are three possible regimes of motion for the sand grains in the wind field. Sand grains with size below 0.125 mm can follow the airflow directly into the contact… More >

  • Open Access

    ARTICLE

    A Simplified Model for the Prediction of the Erosion of a Metal Screen for Sand Control

    Baocheng Shi*, Ruomeng Ying, Lijuan Wu, Jianpeng Pan, Xingkai Zhang, Kai Liu, Yindi Zhang
    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 667-682, 2021, DOI:10.32604/fdmp.2021.012693
    Abstract In oil drilling processes, sand production in the oil layer is a common issue, generally mitigated by means of sand control screens. To prevent or reduce the risk of damage of these screens and to improve the related service life, it is necessary to investigate the related erosion dynamics. In this study, a screen mesh model based on the flow field similarity theory is proposed to overcome the otherwise too complex geometric structure of this type of equipment. Such model is optimized using experimental data. The predicted results are in good agreement with the measured values, and the error is… More >

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