This paper investigates the effects of peripheral wall conduction and Darcy number on laminar mixed convection in the fully developed region of a horizontal square porous channel with a uniform heat input. Because of the combined effects on nonaxisymmetric channel configuration, buoyancy-induced secondary flow, and noninfinite wall conduction parameter, the flow and heat transfer characteristics are greatly affected by the peripherally nonuniform wall temperature distribution. A modified Darcy-Forchheimer-Ergun flow model in the porous medium and a finite-difference method are applied. Secondary flow patterns, isotherms, wall temperature distributions, the friction factor, and the Nusselt number are presented for a flow in the Darcian porous medium (Da→0) to a pure fluid flow (Da → ∞) with Kp = 10−4 − 104, Gr = 0 − 1010, and Pr = 0.1, 0.73, 7.2, and 100. Wall temperature distributions and the Nusselt numbers are compared with existing experimental data.
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Effects of Wall Conduction and Darcy Number on Laminar Mixed Convection in a Horizontal Square Porous Channel
G. J. Hwang,
G. J. Hwang
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, 30043
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C. H. Chao
C. H. Chao
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, 30043
Search for other works by this author on:
G. J. Hwang
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, 30043
C. H. Chao
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, 30043
J. Heat Transfer. Aug 1992, 114(3): 614-621 (8 pages)
Published Online: August 1, 1992
Article history
Received:
February 1, 1991
Revised:
October 1, 1991
Online:
May 23, 2008
Citation
Hwang, G. J., and Chao, C. H. (August 1, 1992). "Effects of Wall Conduction and Darcy Number on Laminar Mixed Convection in a Horizontal Square Porous Channel." ASME. J. Heat Transfer. August 1992; 114(3): 614–621. https://doi.org/10.1115/1.2911325
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