Optimum design of triangular shaped micro mixer in micro channel heat sink

The focus of the present study is on the effect of triangular shaped micro mixers placed between the main stream channels in micro channel heat sink (MCHS). These micro mixers are constructed based on three parameters (inner and outer angle and depth of the joining point) and positioned periodically at an assigned distance. A single unit wall with separated channels is selected from the simple MCHS and micro channel with a triangular shaped micro mixer (MTM) as the computational domain for the numerical simulation. The performance of both micro channels are compared at identical boundary conditions. The effect of volume flow rate of the fluid, flow direction, position of the micro mixer (parallel or alternating), and geometrical parameters of micro mixer on the flow and heat transfer performance of MTM is studied. It is found that the performance of MTM is greatly dependent on the variation of all geometrical parameters. It has to be also highlighted that overall enhancement factor of MTM improved up to 1.53 times compared to simple MCHS with slight reduction in friction factor. This binary benefit of MTM makes it highly possible to be implemented in the practical application.