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Technical Brief

Effect of Thermal Conductivity Ratio on Laminar Double-Diffusive Free Convection in a Porous Cavity

[+] Author and Article Information
Paulo H. S. Carvalho

Departamento de Energia—IEME,
Instituto Tecnológico de Aeronáutica—ITA,
São José dos Campos, SP 12228-900, Brazil

Marcelo J. S. de Lemos

Fellow ASME
Departamento de Energia—IEME,
Instituto Tecnológico de Aeronáutica—ITA,
São José dos Campos, SP 12228-900, Brazil
e-mail: delemos@ita.br

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 28, 2016; final manuscript received April 20, 2017; published online June 1, 2017. Assoc. Editor: Antonio Barletta.

J. Heat Transfer 139(10), 104506 (Jun 01, 2017) (4 pages) Paper No: HT-16-1696; doi: 10.1115/1.4036617 History: Received October 28, 2016; Revised April 20, 2017

This work presents a study on double-diffusive free convection in a porous square cavity using the thermal equilibrium model. Transport equations are discretized using the control-volume method, and the system of algebraic equations is relaxed via the SIMPLE algorithm. The effect of ks/kf on average Nusselt and Sherwood values was investigated. Results show that increasing ks/kf affects Nuw and Shw boosting mass transfer at the expense of reducing overall heat transport across the enclosure.

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Figures

Grahic Jump Location
Fig. 1

Effects of ks/kf for aiding drive, ϕ = 0.8, Da = 10−7, Le = 1, and N = 10 on (a) Nuw, (b) Shw, and (c) v/V0 at X* = 0.003

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