Computational Heat Transfer Fluid Flow Analysis in a Diamond Hole Microchannel

Abstract

— This report is based on a numerical analysis of a three-dimensional analysis of diamond-hole cooling channels in laminar forced convection of a solid body experiencing heat on one side. A diamond hole configuration was studied with different aspect ratios that give a minimum peak temperature at every point in the structure. The solid body volume is fixed and the channel aspect ratio is allowed to change in this direction. The solid body experiences heat flux ( ) on one side and the coolant is allowed to enter into the channels from the opposite side at a given Reynolds number ( ) such that 100 ≤ ≤ 500, and channel aspect ratio ( ) from 1 to 4. The results show that as the and increase, the maximum temperature and thermal resistance ( ) decrease while the Nusselt number increases. Also, the and increase, friction factor decreases and increases, respectively. Comparatively, for a given range of 100 ≤ ≤ 500, and channel aspect ratio ( ) from 1 to 4, about 4%-12% and 37%-44% reduction in the maximum wall temperature and thermal resistance respectively, were reported, while about 55.6%-75% and 50%-68% improvement in Nusselt number and pumping power respectively, were observed. The results establish that heat transfer is improved in the diamond hole channel at various Re and AR. Also, the results reveal that the Colburn j-factor decreases when rises and the aspect ratio decreases due to the heat transfer characteristic increases. Again, pumping power increase rapidly as and increase, which causes a higher pressure drop across the channel and leads to higher energy consumption.