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NUMERICAL STUDY ON NATURAL CONVECTION IN A POROUS CAVITY THAT IS PARTIALLY HEATED AND COOLED BY SINUSOIDAL TEMPERATURE AT VERTICAL WALLS

Том 22, Выпуск 1, 2019, pp. 73-85
DOI: 10.1615/JPorMedia.2019018275
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Краткое описание

We numerically study unsteady natural convection flow in a cavity filled with porous media in two dimensions using a Brinkman–extended Darcy model. The cavity is heated at the lower half of the left vertical wall and cooled at the upper half of the right vertical wall by sinusoidal varying-temperature profiles, with amplitudes for heating λH and for cooling λC. Horizontal and remaining walls are insulated. We use the finite-control volume method to numerically solve governing conservative equations of mass, momentum, and energy. The problem is analyzed for different values of Rayleigh number Ra in the range 103 ≤ Ra ≤ 106, aspect ratio parameter Ar in the range 1 ≤ Ar ≤ 4, and sinusoidal temperature function in ranges 0.25 ≤ λH ≤ 1.0 and 0 ≤ λC ≤ 1.0. Numerical results show that heat transfer is mainly due to conduction at low Ra ≤ 104. The conduction heat-transfer regime is also indicated for low λH and λC ≤ 0.5. Conduction decreases with increasing λH and λC, and convection gradually becomes dominant with increasing Ra and decreasing Ar. Heat transfer increases with increasing Ra, λH, λC, and Ar = 2, when the convection regime is dominant.

ЦИТИРОВАНО В
  1. Mullick Saddam Hossain , DasGupta Debabrata , Kundu Pranab Kumar, NUMERICAL EXAMINATION OF NATURAL CONVECTION AND ENTROPY FORMATION INSIDE AIR-SATURATED POROUS ENCLOSURE TO CREATE THERMALLY ACTIVE REGION WITH PERIODIC HEATING/COOLING , Journal of Porous Media, 25, 9, 2022. Crossref

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