Variable magnetic field (VMF) effect on the heat transfer of a half-annulus cavity filled by Fe3O4-water nanofluid under constant heat flux

被引：36

作者：

Hatami, M. ^{[1
]}

Zhou, J. ^{[2
]}

Geng, J. ^{[2
]}

Jing, D. ^{[2
]}

机构：

[1] Esfarayen Univ Technol, Dept Mech Engn, Esfarayen, North Khorasan, Iran

[2] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Int Res Ctr Renewable Energy, Xian 710049, Shaanxi, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2018年 / 451卷

基金：

中国国家自然科学基金;

关键词：

Variable magnetic field (VMF); Half-annulus cavity; Nanofluid; Hartmann; Nusselt; MHD NATURAL-CONVECTION; TRANSFER ENHANCEMENT; MINI-CHANNEL; WAVY CAVITY; FERROFLUIDS; FLOW; OPTIMIZATION; TRANSVERSE;

D O I：

10.1016/j.jmmm.2017.10.110

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, the effect of a variable magnetic field (VMF) on the natural convection heat transfer of Fe3O4-water nanofluid in a half-annulus cavity is studied by finite element method using FlexPDE commercial code. After deriving the governing equations and solving the problem by defined boundary conditions, the effects of three main parameters (Hartmann Number (Ha), nanoparticles volume fraction (phi) and Rayleigh number (Ra)) on the local and average Nusselt numbers of inner wall are investigated. As a main outcome, results confirm that in low Eckert numbers, increasing the Hartmann number make a decrease on the Nusselt number due to Lorentz force resulting from the presence of stronger magnetic field. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：173 / 182

页数：10

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