MHD natural convection in an enclosure from two semi-circular heaters on the bottom wall

被引：55

作者：

Oztop, Hakan F. ^{[2
,3
]}

Rahman, M. M. ^{[1
,4
]}

Ahsan, A. ^{[5
,6
]}

Hasanuzzaman, M. ^{[1
,7
]}

Saidur, R. ^{[1
,7
]}

Al-Salem, Khaled ^{[3
]}

Rahim, N. A. ^{[1
]}

机构：

[1] Univ Malaya, Ctr Res UMPEDAC, Fac Engn, Kuala Lumpur 50603, Malaysia

[2] Firat Univ, Dept Mech Engn, Fac Technol, TR-23169 Elazig, Turkey

[3] King Saud Univ, Dept Mech Engn, Coll Engn, Riyadh, Saudi Arabia

[4] Bangladesh Univ Engn & Technol, Dept Math, Dhaka 1000, Bangladesh

[5] Univ Putra Malaysia, Dept Civil Engn, Fac Engn, Upm Serdang 43400, Selangor, Malaysia

[6] Univ Putra Malaysia, Green Engn & Sustainable Technol Lab, Inst Adv Technol, Upm Serdang 43400, Selangor, Malaysia

[7] Univ Malaya, Dept Mech Engn, Fac Engn, Kuala Lumpur 50603, Malaysia

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2012年 / 55卷 / 7-8期

关键词：

Magnetohydrodynamics; Natural convection; Heat transfer; Semi-circular heater; Finite element method; ACTIVE VERTICAL WALLS; SQUARE CAVITY; MIXED CONVECTION; FLOW; MAGNETOCONVECTION; CYLINDER; UNIFORM; FLUIDS; FLUX;

D O I：

10.1016/j.ijheatmasstransfer.2011.11.037

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A computational study of the thermal and dynamical behavior of fluid in an enclosure with two isothermal semi-circular heaters is presented. The top wall and the flat surfaces on bottom wall are adiabatic while the vertical walls are kept at lower temperature than the semi-circular heaters. The radius of curvature of the semi-circular surfaces is chosen as one tenth of the cavity wall length. The governing equations are solved by the Galerkin weighted residual finite element method. The effect of magnetic field on the flow is another important parameter in this study. Numerical simulations were performed for several values of Rayleigh number (10(3) <= Ra <= 10(6)), Hartmann number (0 <= Ha <= 50) and the distance between two semi-circular heaters (0.2 <= D <= 0.8). In all cases the Prandtl number is taken as 7. It is found that the distance between the semi-circular heaters is the most important parameter affecting the heat and fluid flow fields. In addition, Hartmann number was found to have an adverse affect on heat transfer. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1844 / 1854

页数：11

共 25 条

[1] Natural convection in enclosures with localized heating from below and symmetrical cooling from sides [J].