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NATURAL CONVECTION IN HORIZONTAL POROUS LAYERS: EFFECTS OF DARCY AND PRANDTL NUMBERS.

Author(s) : KLADIAS N., PRASAD V.

Type of article: Article

Summary

NATURAL CONVECTION IN HORIZONTAL POROUS LAYERS HEATED FROM BELOW IS STUDIED BY EMPLOYING A FORMULATION BASED ON THE BRINKMAN-FORCHHEIMER-EXTENDED DARCY EQUATION OF MOTION. THE CONVECTIVE FLOW IS INITIATED AT LOWER FLUID RAYLEIGH NUMBER, THAN THAT PREDICTED BY THE LINEAR STABILITY ANALYSIS FOR THE DARCY FLOW MODEL. AN INCREASE IN THE THERMAL CONDUCTIVITY OF SOLID PARTICLES HAS A STABILIZING EFFECT. IN THE STABLE CONVECTION REGIME, THE HEAT TRANSFER RATE INCREASES WITH THE RAYLEIGH NUMBER, THE PRANDTL NUMBER, THE DARCY NUMBER, AND THE RATIO OF THE SOLID AND FLUID THERMAL CONDUCTIVITIES. THERE EXISTS AN ASYMPTOTIC CONVECTION REGIME WHERE THE POROUS MEDIA SOLUTIONS ARE INDEPENDENT OF THE PERMEABILITY OF THE POROUS MATRIX OR DARCY NUMBER.

Details

  • Original title: NATURAL CONVECTION IN HORIZONTAL POROUS LAYERS: EFFECTS OF DARCY AND PRANDTL NUMBERS.
  • Record ID : 1990-1825
  • Languages: English
  • Source: J. Heat Transf. - vol. 111 - n. 4
  • Publication date: 1989
  • Document available for consultation in the library of the IIR headquarters only.

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