Combined mixed convection and radiation in ventilated cavities

Abstract

The interaction between mixed convection and thermal radiation in ventilated cavities with gray surfaces has been studied numerically using the Navier‐Stokes equations with the Boussinesq approximation. The effect of thermal radiation on streamlines and isotherms is shown for different values of the governing parameters namely, the Rayleigh number (103 ≤ Ra ≤ 106), the Reynolds number (50 ≤ Re ≤ 5000) and the surfaces emissivity (0 ≤ ε≤ 1). The geometrical parameters are the aspect ratio of the cavity A = L’/H’ = 2 and the relative height of the openings B = h’/H’ = 1/4. Results of the study show that thermal radiation alters significantly the temperature distribution, the flow fields and the heat transfer across the active walls of the cavities.

Double Diffusive Mixed Convection Heat Transfer inside a Vented Square Cavity

“…Later, Raji and Hasnaoui [11] investigated the mixed convection in ventilated cavities where the horizontal top wall and the vertical left wall were prescribed with equal heat fluxes. Similar investigations were also carried out by the same authors taking into consideration the effect of the thermal radiation on mixed convection [12].…”

Optimum ventilation based on the overall ventilation effectiveness for temperature distribution in ventilated cavities

“…Another configurations and heat flux conditions in ventilated cavities were analyzed by Raji and Hasnaoui [6][7][8][9]. On recent works Raji that radiation contributes to the homogenization over temperature distribution and a decrease on the maximum temperature inside the cavity can be observed [9]. Singh and Sharif [10] carried out a study with 6 different configurations of inlet and outlet of air.…”

“…The authors reported in [3] and [4] that flow patterns describe oscillating patterns due to floating forces generated by the heat source, and cooling efficiency improves if the air outlet is located on the lower side of the vertical wall; later in [5], the authors extended the study to an inclined channel, and they concluded that the best behavior on heat transfer is found on vertical channels. Another configurations and heat flux conditions in ventilated cavities were analyzed by Raji and Hasnaoui [6][7][8][9]. On recent works Raji that radiation contributes to the homogenization over temperature distribution and a decrease on the maximum temperature inside the cavity can be observed [9].…”

Numerical Study of Combined Radiation and Turbulent Mixed Convection Heat Transfer in a Compartment Containing Participating Media

“…Among of these systems, Raji and Hasnaoui [2] studied numerically the interaction between laminar mixed convection and thermal radiation in ventilated cavities with gray surfaces. Their results showed that thermal radiation significantly alters the temperature distribution, the flow fields and the heat transfer across the active walls of the cavities.…”