| Summary: In this study, mixed convection heat transfer in a horizontal channel with discrete heat sources is investigated experimentally and numerically. The aim of the study is to enhance cooling performance in mixed convection through the channel. In this study, the effects of distance between heat sources, heat dissipation ratio and Reynolds number on heat transfer are investigated. In the studies, flush mounted and protruding heat sources have been used. The studies are carried out for modified Grashof numbers of 1.15e7, 1.34e7, 1.53e7 and Reynolds numbers between 792 and 3962. Radiative heat transfer between the surfaces is considered. Velocities and temperatures are measured, and flow visualization studies are carried out in the experimental study. Numerical computations are performed with ANSYS Fluent (v.15) software. The results obtained the study have shown that the distance between heat sources, the use of different heat dissipation and Reynolds number affect the cooling performance. As a result of the studies, it is observed that the increase in the distance between heat sources and Reynolds number increases the global cooling performance of the system. In addition to the decreasing thermal density from entrance increases the cooling performance.
Key Words: Horizontal channel, mixed convection, spacing ratio, heat dissipation ratio, Nusselt number, global conductance. |
