Caizhe Hao¹, Xiaoming Song^{1, *}, Zhining Jia¹

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 391-401, 2019, DOI:10.32604/fdmp.2019.07771

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 >

Pengxiao Chen¹, Kai Huang^{1, 2}, Fenghe Wang¹, Weijun Xie¹, Shuo Wei¹, Deyong Yang^{1, *}

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 367-389, 2019, DOI:10.32604/fdmp.2019.07762

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 More >

Zhiyuan Cheng^{1, 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

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 More >

Chaoyi Wan^{1, *}

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 343-356, 2019, DOI:10.32604/fdmp.2019.07812

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 More >

Yanxu Guo¹, Peng Zhao², Qingsong Zhang¹, Rentai Liu^1,*, Lianzhen Zhang³, Yankai Liu¹

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 321-342, 2019, DOI:10.32604/fdmp.2019.07844

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 More >

Hongwang Zhao^{1, *}, Yuanhua Chen¹, Xiaogang Liu²

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 293-305, 2019, DOI:10.32604/fdmp.2019.08361

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… More >

Liang Tian¹, Zhigang Fang^{2, 3,*}

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 285-291, 2019, DOI:10.32604/fdmp.2019.00285

Abstract This article has no abstract. More >

Xiaorui Cheng^{1, 2, *}, Hongxing Chen¹, Xiaoquan Wang¹

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.3, pp. 271-284, 2019, DOI:10.32604/fdmp.2019.07250

Abstract In order to study the influence of the wrap angle relating to the space guide vane of a submersible well pump (250QJ125) on the flow field and pump performance, seven possible configurations have been considered (obtained by changing the blade wrap angle while keeping unchanged all the other parameters). Such configurations have been numerically simulated in the framework of a computational model based on the Reynolds time-averaged N-S equations, the RNG k-ε turbulence approach and the SIMPLE algorithm. The impact exerted by different wrap angles of the guide vane on the performance of the pump, the… More >

Houda Jalali^{1, ∗}, Hassan Abbassi¹

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.3, pp. 253-270, 2019, DOI:10.32604/fdmp.2019.03896

Abstract The addition of nanoparticles into liquid, even at low concentrations, leads to an increase in both, dynamic viscosity and thermal conductivity. Furthermore, the increase in temperature causes an increase in thermal conductivity and a decrease in the nanofluid viscosity. In this context, a numerical investigation of the competition between viscosity and thermal conductivity about their effects on heat transfer by Al₂O₃-water nanofluid was conducted. A numerical study of heat transfer in a square cavity, filled with Al₂O₃-water nanofluid and heated from the left side, was presented in this paper. Continuity, momentum, and thermal energy equations are… More >

N. Vijaya¹, G. Venkata Ramana Reddy^{1, *}, Y. Hara Krishna¹

FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.3, pp. 233-251, 2019, DOI:10.32604/fdmp.2019.03727

Abstract This paper investigates the problem of oblique hydro magnetic stagnation point flow of an electrically conducting Casson fluid over stretching sheet embedded in a doubly stratified medium in the presence of thermal radiation and heat source/absorption with first order chemical reaction. It is assumed that the fluid impinges on the wall obliquely. Similarity variables were used to convert the partial differential equations to ordinary differential equations. The transformed ordinary differential equations are solved numerically using Runge-Kutta-Fehlberg method with shooting technique. It is observed that a boundary layer is formed when the stretching velocity of the… More >