Effects of wall conduction and Darcy number on laminar mixed convection in a horizontal square porous channel

Journal Article · Sat Aug 01 00:00:00 EDT 1992 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.2911325· OSTI ID:6974732

Hwang, G J; Chao, C H ^[1]

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1. National Tsing Hua Univ., Hsinchu (Taiwan)

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[r arrow]0) to a pure fluid flow (Da[r arrow][infinity]) with Kp=10[sup [minus]4][minus]10[sup 4], Gr=0[minus]10[sup 10], and Pr=0.1, 0.73, 7.2, and 100. Wall temperature distributions and the Nusselt numbers are compared with existing experimental data.

• OSTI ID: 6974732
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 114:3; ISSN JHTRAO; ISSN 0022-1481
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CALCULATION METHODS
CONVECTION
DARCY LAW
DUCTS
ENERGY TRANSFER
FINITE DIFFERENCE METHOD
FLUID FLOW
FORCED CONVECTION
HEAT TRANSFER
ITERATIVE METHODS
LAMINAR FLOW
MASS TRANSFER
MATERIALS
NUMERICAL SOLUTION
NUSSELT NUMBER
ORIENTATION
POROUS MATERIALS
TEMPERATURE DISTRIBUTION
THERMAL CONDUCTION
WALLS