Mixed convection with heating effects in a vertical porous annulus with a radially varying magnetic field

被引：60

作者：

Barletta, A. ^{[3
]}

Lazzari, S. ^{[3
]}

Magyari, E. ^{[2
]}

Pop, I. ^{[1
]}

机构：

[1] Univ Cluj, Fac Math, R-3400 Cluj Napoca, Romania

[2] ETH, Inst Hochbautech, CH-8093 Zurich, Switzerland

[3] Univ Bologna, DIENCA, I-40136 Bologna, Italy

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2008年 / 51卷 / 25-26期

关键词：

Mixed convection; Fully developed regime; MHD flow; Porous medium; Darcy law; Analytical solution;

D O I：

10.1016/j.ijheatmasstransfer.2008.05.018

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Fully developed parallel flow in an annular region filled with a porous medium surrounding an electric cable is investigated. The effects of buoyancy and MHD force as well as the heat generation due to joule heating and viscous dissipation are taken into account. The mixed convection seepage flow is analyzed according to Darcy law and to Boussinesq approximation. Buoyancy effect is modelled by setting the isoflux wall temperature as the reference temperature. As a consequence of this choice, the local momentum and energy balance equations and the boundary conditions can be written in a dimensionless form that defines an initial value problem instead of a boundary value problem. The initial value problem is solved both by an analytical series method and by numerical integration. The effect of the radially varying magnetic field on the fluid velocity and temperature distributions is analyzed. It is shown that a significantly strong magnetic force tends to inhibit the flow even for a high hydrodynamic pressure gradient. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：5777 / 5784

页数：8

共 23 条

[1] Magnetofluidconvection in a rotating porous layer under modulated temperature on the boundaries [J].