Conjugate Natural Convection in a Porous Enclosure with Non-Uniform Heat Generation

H. Saleh, Ishak Hashim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Effects of a conductive wall on natural convection in a square porous enclosure having internal heating at a rate proportional to a power of temperature difference is studied numerically in this article. The horizontal heating is considered, where the vertical walls heated isothermally at different temperatures while the horizontal walls are kept adiabatic. The Darcy model is used in the mathematical formulation for the porous layer and finite difference method is applied to solve the dimensionless governing equations. The governing parameters considered are the Rayleigh number (0 ≤ Ra ≤ 1000), the internal heating and the local exponent parameters (0 ≤ γ ≤ 5), (1 ≤ λ ≤ 3), the wall to porous thermal conductivity ratio (0.44 ≤ Kr ≤ 9.9) and the ratio of wall thickness to its width (0.02 ≤ D ≤ 0.5). The results are presented to show the effect of these parameters on the fluid flow and heat transfer characteristics. It is found a strong internal heating can generate significant maximum fluid temperature more than the conductive solid wall. Increasing value thermal conductivity ratio and/or decreasing the thickness of solid wall can increase the maximum fluid temperature. It is also found that at very low Rayleigh number, the heat transfer across the porous enclosure remain stable for any values of the thermal conductivity ratio.

Original languageEnglish
Pages (from-to)759-774
Number of pages16
JournalTransport in Porous Media
Volume94
Issue number3
DOIs
Publication statusPublished - Sep 2012

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Heat generation
Enclosures
Natural convection
Heating
Thermal conductivity
Heat transfer
Temperature
Fluids
Finite difference method
Flow of fluids

Keywords

  • Conjugate heat transfer
  • Darcy's law
  • Finite difference method
  • Natural convection

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Catalysis

Cite this

Conjugate Natural Convection in a Porous Enclosure with Non-Uniform Heat Generation. / Saleh, H.; Hashim, Ishak.

In: Transport in Porous Media, Vol. 94, No. 3, 09.2012, p. 759-774.

Research output: Contribution to journalArticle

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