Home / Journals / FDMP / Vol.15, No.4, 2019
Table of Content
  • Open Access

    EDITORIAL

    Review of the Special Issue on EFD and Heat Transfer

    Liang Tian1, Zhigang Fang2, 3,*
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 285-291, 2019, DOI:10.32604/fdmp.2019.00285
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract This article has no abstract. More >

  • Open Access

    ARTICLE

    Optimization of the Heat Dissipation Structure and Temperature Distribution in an Electric Vehicle Power Battery

    Hongwang Zhao1, *, Yuanhua Chen1, Xiaogang Liu2
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 293-305, 2019, DOI:10.32604/fdmp.2019.08361
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract In order to ensure that the lithium-ion battery pack keeps good working performance during the driving of electric vehicle, the heat generation mechanism and heat transfer characteristics of lithium-ion battery are analyzed. The power battery pack of electric vehicle is simulated by advanced vehicle simulator. The simulation results of battery pack current under typical cycle conditions and the heat source curve of lithium ion battery are obtained, which provide data for the simulation of heat source input of battery temperature field. On this basis, the flow field and temperature fiel d of the original lithium-ion battery pack of electric vehicle… More >

  • Open Access

    ARTICLE

    A Control Algorithm for the Optimization of Batch Reactor-Based Processes

    Yanling Bai1,*, Feng Liu2
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 307-319, 2019, DOI:10.32604/fdmp.2019.07833
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract Levenberg-Marquardt (LM) algorithm is applied for the optimization of the heat transfer of a batch reactor. The validity of the approach is verified through comparison with experimental results. It is found that the mathematical model can properly describe the heat transfer relationships characterizing the considered system, with the error being kept within ±2°C. Indeed, the difference between the actual measured values and the model calculated value curve is within ±1.5°C, which is in agreement with the model assumptions and demonstrates the reliability and effectiveness of the algorithm applied to the batch reactor heat transfer model. Therefore, the present work provides… More >

  • Open Access

    ARTICLE

    Investigation of the Mechanism of Grout Penetration in Intersected Fractures

    Yanxu Guo1, Peng Zhao2, Qingsong Zhang1, Rentai Liu1,*, Lianzhen Zhang3, Yankai Liu1
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 321-342, 2019, DOI:10.32604/fdmp.2019.07844
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract To study the penetration mechanism of cement-based slurry in intersected fractures during grouting and the related pressure distribution, we have used two different variants of cement, namely, basic cement slurry and fast-setting cement slurry. The influence of a retarder, time-varying viscosity, fracture width and location of injection hole is also considered. A finite element software is used to implement two and three-dimensional numerical models for grouting of intersected fractures in hydrostatic conditions. Results show that there are significant differences in the diffusion morphology and pressure distribution depending on the considered cement slurry. Retarder can effectively slow down the rising rate… More >

  • Open Access

    ARTICLE

    A Numerical Investigation of the Thermal Performances of an Array of Heat Pipes for Battery Thermal Management

    Chaoyi Wan1, *
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 343-356, 2019, DOI:10.32604/fdmp.2019.07812
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract A comparative numerical study has been conducted on the thermal performance of a heat pipe cooling system considering several influential factors such as the coolant flow rate, the coolant inlet temperature, and the input power. A comparison between numerical data and results available in the literature has demonstrated that our numerical procedure could successfully predict the heat transfer performance of the considered heat pipe cooling system for a battery. Specific indicators such as temperature, heat flux, and pressure loss were extracted to describe the characteristics of such a system. On the basis of the distributions of the temperature ratio of… More >

  • Open Access

    ARTICLE

    On the Application of a Mobile Grid Technology to Computational Fluid Dynamics

    Zhiyuan Cheng1, 2, *, Yulan Wang1, Yingang Wang2, Qiong Nie2
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 357-366, 2019, DOI:10.32604/fdmp.2019.07843
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract On the basis of harmonic mapping theory, a mobile grid technology is applied to computational fluid dynamics (CFD). Starting from the observation that standard fixed-grid techniques often fail in addressing problems with large deformations, we elaborate a new algorithm relying on the software COMSOL Multiphysics 5.3a to solve the coupling of the mobile grid equation and the governing differential equations for fluid flow. The motion of water in a water tank when the tank waggles is simulated. We demonstrate that this technology can be implemented without a significant increase in the computational cost with respect to standard numerical methods More >

  • Open Access

    ARTICLE

    Simulation of Heat and Mass Transfer in a Grain Pile on the Basis of a 2D Irregular Pore Network

    Pengxiao Chen1, Kai Huang1, 2, Fenghe Wang1, Weijun Xie1, Shuo Wei1, Deyong Yang1, *
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 367-389, 2019, DOI:10.32604/fdmp.2019.07762
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract The so-called pore network model has great advantages in describing the process of heat and mass transfer in porous media. In order to construct a random two-dimensional (2D) irregular pore network model for an unconsolidated material, image processing technology was used to extract the required topological and geometric information from a 2D sample of soybean particles, and a dedicated algorithm was elaborated to merge some adjacent small pores. Based on the extracted information, a 2D pore network model including particle information was reconstructed and verified to reflect the pore structure of discrete particles. This method was used to reconstruct a… More >

  • Open Access

    ARTICLE

    Influence of the Hole Chamfer on the Characteristics of a Multi-hole Orifice Flowmeter

    Caizhe Hao1, Xiaoming Song1, *, Zhining Jia1
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 391-401, 2019, DOI:10.32604/fdmp.2019.07771
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract In order to analyze the influence of the hole chamfer on the metering performances of a Multi-hole Orifice Flowmeter and optimize the related orifice structure, a multi-hole orifice flowmeter with DN80 and throttle ratio of 0.45 was considered in the present study. The flow field characteristics were determined in the framework of a CFD technique. The results show that the multi-hole orifice flowmeter with filleting transition around the throttle orifice has higher accuracy in a wide range of the space of parameters, and is more suitable for accurate measurement of fluid in process control. More >

  • Open Access

    ARTICLE

    Experimental and Theoretical Analysis of the Drag Torque in Wet Clutches

    Haojie Pan1, *, Xiaojun Zhou1
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 403-417, 2019, DOI:10.32604/fdmp.2019.07808
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract Traditional mathematical models cannot predict and explain the phenomenon by which the drag torque (DT) in wet clutches rises in the high-speed zone. In order to evaluate the DT in such conditions, a two-phase air-fluid mathematical model for a DT with grooves was elaborated. The mathematical model was based on the theory of viscous fluid flow. A two-phase volume of fluid model was also used to investigate the distribution and volume fraction of air and fluid. Experiments on three friction plates with different grooves were conducted to validate the resulting mathematical model. It was found that the gap between plates… More >

  • Open Access

    ARTICLE

    Determination of the Thermodynamic Properties of Water and Steam in the p-T and p-S Planes via Different Grid Search Computer Algorithms

    Dugang Guo1, *
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 419-430, 2019, DOI:10.32604/fdmp.2019.07831
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract The role of different grid search computer algorithms for the determination of the thermodynamic properties of water and steam in the p-T and P-S planes has been investigated via experimental and analytical methods. The results show that the spline interpolation grid search algorithm and the power grid search algorithm are more efficient, stable and clear than other algorithms. More >

  • Open Access

    ARTICLE

    Water Flow Characteristics and Related Effects in PEMFC

    Mingge Wu1, Lei Wang1, Yixiang Wang1, Cheng Zhang1, Cheng Qiu1, 2, *
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 431-444, 2019, DOI:10.32604/fdmp.2019.08209
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract Water management in proton exchange membrane fuel cells (PEMFC) is a topic of great importance for the optimization of these systems. Effective proton conductivity calls for moderate moisture content in the membrane, while uneven water distribution can lead to instability of the whole flow field, thereby decreasing the performance of the fuel cell. In the present study, a simplified two-tier hybrid structure is used to investigate the impact of the dynamic behavior of liquid water on the current density of the PEMFC. Simulation results show that water droplets attached to wall sides tend to increase current density. Visualization experiments confirm… More >

  • Open Access

    ARTICLE

    An Experimental Study on Fuel Combustion Under External Irradiance

    Jianjun Liang1, Zhe Song2, Peili Zhang1, *
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 445-458, 2019, DOI:10.32604/fdmp.2019.07951
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract In order to investigate the burning characteristics of a 0# diesel and 3# jet fuel, a small-scale experimental bench mainly composed of a cone calorimeter was arranged. The heat release and burning rates were investigated changing the external irradiance in order to clarify the triadic relationship among these quantities. The effective heat of combustion of 0# diesel and 3# jet fuel were 38.89 MJ/kg and 43.15 MJ/kg, respectively, with the corresponding combustion efficiencies being 96.78% and 99.60% (the effective peak heat of combustion being 1.665 times the mean value for both types of fuel). According to our experimental results, the… More >

  • Open Access

    ARTICLE

    An Analysis of the Stretching Mechanism of a Liquid Bridge in Typical Problems of Dip-Pen Nanolithography By Using Computational Fluid Dynamics

    Cheng Zhang1, *, Mingge Wu1
    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 459-469, 2019, DOI:10.32604/fdmp.2019.08477
    (This article belongs to this Special Issue: EFD and Heat Transfer)
    Abstract A computational study of the stretching mechanism of a liquid bridge and the effect of the liquid properties on the DPN (dip-pen nanolithography) process is presented. The results show that the viscosity and contact angle can have an appreciable influence on these processes. The greater the viscosity, the harder the liquid bridge is to break, which allows more molecular transfer during the DPN spotting process. Besides, when the contact angle between the liquid and substrate is less than 60 degrees, the time required to stretch the bridge and break it grows with the contact angle. During the stretching process, the… More >

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