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COMBINED EFFECTS OF RADIATION AND NATURAL CONVECTION IN A SQUARE CAVITY SUBMITTED TO CROSS GRADIENTS OF TEMPERATURE: CASE OF PARTIAL HEATING AND COOLING

卷 3, 册 1, 2011, pp. 73-87
DOI: 10.1615/ComputThermalScien.v3.i1.60
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摘要

The present paper reports numerical results of natural convection and surface radiation within a square cavity filled with air and discretely heated and cooled from the four walls. In this study, the bottom active wall is at higher temperature than that of the top active wall. The remaining portions of the horizontal walls are considered adiabatic. The parameters governing the problem are the emissivity of the walls (0 ≤ ε ≤ 1), the relative lengths of the active elements (0.1 ≤ B = h'/H' = l'/L ≤ 0.9), and the Rayleigh number (104 ≤ Ra ≤ 3 × 106). The effect of these parameters on heat transfer and fluid flow within the cavity is examined. Results of the study are presented and compared to the case of pure natural convection for various typical combinations of the governing parameters in terms of flow and temperature patterns, average convective, radiative, and total Nusselt numbers. The heatlines visualization technique, which is a useful means for understanding the mechanism of heat flow, is employed to exhibit the direction and intensity of heat flux in the cavity.

对本文的引用
  1. Ayachi Rachid El, Raji Abdelghani, Naïmi Mohamed, Elharfi Hassan, Hasnaoui Mohammed, Effect of Sinusoidal Heating on Natural Convection Coupled to Thermal Radiation in a Square Cavity Subjected to Cross Temperature Gradients, Journal of Electronics Cooling and Thermal Control, 03, 01, 2013. Crossref

  2. Tao Wen-Quan, He Ya-Ling, Chen Lei, A comprehensive review and comparison on heatline concept and field synergy principle, International Journal of Heat and Mass Transfer, 135, 2019. Crossref

  3. Mazgar A, Ben Nejma F, Combined effect of natural convection and non-gray gas radiation with partial heating, Sādhanā, 41, 7, 2016. Crossref

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