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EFFECT OF RADIATIVE TRANSFER ON THE ONSET OF CONVECTION IN A POROUS MEDIUM.

Author(s) : VORTMEYER D., RUDRAIAH N., SASIKUMAR T. P.

Type of article: Article

Summary

THE EFFECT OF RADIATIVE TRANSFER ON THERMAL CONVECTION OF A THIN FLUID-SATURATED DENSELY PACKED POROUS LAYER BOUNDED BY STRESS-FREE RADIATING HORIZONTAL PLANES HEATED FROM BELOW IS STUDIED USING LINEAR THEORY. THE COEFFICIENTS OF ABSORPTION, EMISSION AND SCATTERING ARE COMPUTED. THE MILNE-EDDINGTON APPROXIMATION IS EMPLOYED TO DETERMINE APPROXIMATE SOLUTIONS VALID FOR OPTICALLY THIN (TRANSPARENT) AND OPTICALLY THICK (OPAQUE) GRAY MEDIA WHICH ABSORB AND EMIT THERMAL RADITO. THE EFFECT OF RADIATION PARAMETERS ON THE CELL SIZE AND ON THE ONSET OF CONVECTION ARE STUDIED. IT IS SHOWN THAT THE EFFECT OF RADIATION IS TO INHIBIT THE ONSET OF CONVECTION IN A POROUS MEDIUM. THE EXPLANATION IS GIVEN, TAKING INTO ACCOUNT THE INCREASE IN THERMAL CONDUCTIVITY DUE TO THE COMBINED EFFECTS OF THE POROSITY OF THE MEDIUM AND RADIATION.

Details

  • Original title: EFFECT OF RADIATIVE TRANSFER ON THE ONSET OF CONVECTION IN A POROUS MEDIUM.
  • Record ID : 1989-2175
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 32 - n. 5
  • Publication date: 1989

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