Effects of buoyancy ratio on unsteady double-diffusive natural convection in a cavity filled with porous medium with non-uniform boundary conditions

被引：45

作者：

Mondal, Sabyasachi ^{[1
]}

Sibanda, Precious ^{[1
]}

机构：

[1] Univ KwaZulu Natal, Sch Math Stat & Comp Sci, Pietermaritzburg, South Africa

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2015年 / 85卷

关键词：

Double-diffusive convection; Finite-difference method; Non-uniformly heated walls; Non-uniformly concentrated walls; Porous media; SQUARE CAVITY; MIXED CONVECTION; HEAT; FLUID; FLOW;

D O I：

10.1016/j.ijheatmasstransfer.2015.01.129

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The effects of buoyancy ratio on unsteady double-diffusive natural convection in a cavity filled with porous medium with uniform and non-uniform boundary conditions are analyzed in this paper. It is assumed that the left vertical wall and bottom wall are heated and concentrated (uniformly and nonuniformly), while the right vertical wall is maintained at a constant cold temperature, and the top wall is well insulated. The governing equations are solved numerically using a staggered grid finite-difference method to determine the streamlines, isotherms, isoconcentrations, local Nusselt number, local Sherwood number, average Nusselt number and average Sherwood number for various values of buoyancy ratio and Rayleigh number. The change of flow patterns with respect to time depicted and described here. The results are compared with previously published work and excellent agreement has been obtained. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：401 / 413

页数：13

共 26 条

[1]

[Anonymous], 2013, INT J APPL MATH MECH

[2]

[Anonymous], 15 BRAZ C MECH ENG A

[3]

[Anonymous], HEAT MASS TRANSFER

[4] Analysis of heatlines for natural convection within porous trapezoidal enclosures: Effect of uniform and non-uniform heating of bottom wall [J].

Basak, Tanmay ;

Roy, S. ;

Matta, Anjanna ;

Pop, I. .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2010, 53 (25-26) :5947-5961

[5] Correlations for combined heat and mass transfer from an open cavity in a horizontal channel [J].

Brown, NM ;

Lai, FC .

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 2005, 32 (08) :1000-1008

[6] Fluid, heat and contaminant transport structures of laminar double-diffusive mixed convection in a two-dimensional ventilated enclosure [J].

Deng, QH ;

Zhou, JM ;

Mei, C ;

Shen, YM .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2004, 47 (24) :5257-5269

[7]

Ingham DB., 2005, TRANSPORT PHENOMENA

[8] Non-Darcian effects on double-diffusive convection within a porous medium [J].

KarimiFard, M ;

CharrierMojtabi, MC ;

Vafai, K .

NUMERICAL HEAT TRANSFER PART A-APPLICATIONS, 1997, 31 (08) :837-852

[9]

Mahapatra T.P., 2011, International Journal of Nonlinear Science, V11, P366

[10] Effects of buoyancy ratio on double-diffusive natural convection in a lid-driven cavity [J].

Mahapatra, Tapas Ray ;

Pal, Dulal ;

Mondal, Sabyasachi .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2013, 57 (02) :771-785

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