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THREE-DIMENSIONAL FREE CONVECTIVE HEAT TRANSFER IN SATURATED POROUS MEDIA WITH MAXIMUM DENSITY EFFECTS.

CONVECTION NATURELLE TRIDIMENSIONNELLE EN MILIEU POREUX SATURE PAR UN FLUIDE PRESENTANT UN MAXIMUM DE DENSITE.

Author(s) : ALTIMIR I.

Type of article: Article

Summary

A NUMERICAL STUDY HAS BEEN CARRIED OUT TO INVESTIGATE THE EFFECTS OF DENSITY INVERSION ON FREE CONVECTIVE HEAT TRANSFER IN A CONFINED POROUS MEDIUM FROM A THREE-DIMENSIONAL MODEL OF TEMPERATURE AND VELOCITY FIELDS. THE POROUS MEDIUM IS CONFINED IN A PARALLELEPIPEDIC BOX WITH HORIZONTAL BOUNDARIES MAINTAINED AT UNIFORM TEMPERATURES AND THE VERTICAL WALLS ARE ADIABATIC. A PARABOLIC DENSITY-TEMPERATURE RELATIONSHIP IS USED IN DARCY'S LAW. THE ANALYSIS IS PERFORMED USING A THREE-DIMENSIONAL MODEL BASED ON THE GALERKIN METHOD. AN EXPLICIT TIME INTEGRATION SCHEME IS USED. THE COMPUTATION WAS MADE ASSUMING A CUBIC BOX. NUMERICAL RESULTS ARE DISCUSSED, SHOWING THAT DENSITY INVERSION CAUSES THE FLUID DEPTH TO BE DIVIDED INTO TWO DISTINCTIVE REGIONS: A LOWER ONE IN WHICH THE HEAT TRANSFER IS CHIEFLY CONVECTIVE, AN UPPER STABLE ONE IN WHICH THE HEAT TRANSFER OCCURS BY CONDUCTION PRIMARILY. THE EFFECTS OF MAXIMUM DENSITY ON NUSSELT NUMBER ARE ALSO PRESENTED.

Details

  • Original title: CONVECTION NATURELLE TRIDIMENSIONNELLE EN MILIEU POREUX SATURE PAR UN FLUIDE PRESENTANT UN MAXIMUM DE DENSITE.
  • Record ID : 1985-0981
  • Languages: French
  • Source: International Journal of Heat and Mass Transfer - vol. 27 - n. 10
  • Publication date: 1984/10

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