Search

In the present paper, numerical computations have been carried out to investigate the mixed convection developing within a cavity ventilated by injection / suction of a cold jet of isothermal air, interacting with the external environment through two openings arranged in the middle of the left and right vertical walls. The remaining portions of the left vertical wall are subjected to a constant heat flux, while, the remaining walls of the cavity are perfectly insulated. The combined effects of the basic parameters namely the Reynolds number, 20≤Re≤3000, the walls emissivity, 0≤ε ≤ 0.85, and the imposed external flow mode (injection or suction) on the flow characteristics and heat transfer are examined. The results revealed that, for both modes of ventilation, the contribution of radiation to the total heat transfer is significant even for a predominant forced convection regime particularly for high values of wall emissivity. [ABSTRACT FROM AUTHOR]

A numerical study has been executed to analyze the effects of thermal radiation and Prandtl number on mixed convective flow and heat transfer characteristics inside a lid driven square cavity. Where the cavity is heated uniformly from the left wall and cooled from the right side while thermal insulation is imposed on horizontal walls. The finite difference method is used to solve the full governing equations for which the Boussinesq approximation is adopted. The results are explored over a range of Prandtl number, Pr, (1, 7 and 50), radiation parameter, Rd, (0 ≤ Rd ≤ 10), and for constant Grashof number of 104. The results indicate that the flow and thermal fields as well as the heat transfer rate and the flow intensity in the square cavity depend significantly on the mentioned parameters. [ABSTRACT FROM AUTHOR]

This paper reports a numerical study on mixed convection of thermo-dependent shear-thickening fluids combined with thermal radiation effect in a lid-driven square cavity. The cavity is uniformly heated / (cooled) from the left / (right) while the horizontal walls are thermally insulated. The finite difference method is used to solve the full governing equations for which the Boussinesq approximation is adopted. Effects of the governing parameters, namely, Richardson number and the Pearson number on the flow and heat transfer are analyzed. It has been found that the augmentation of Richardson number decreases the heat transfer and enhances the convective flow. [ABSTRACT FROM AUTHOR]