Performance analysis of hybrid microchannel heat sink for varying nozzle geometry and layout on the basis of first- and second-law of thermodynamics

This paper investigates the enhanced cooling performance of a hybrid microchannel heat sink, consists of the microchannel, nozzle and pillars, in terms of various hydrothermal characteristic parameters. Geometric and flow variables such as jet inclination angle (30 degrees-90 degrees), Reynolds number (200-600) and nozzle diameter (in increasing/decreasing order) are considered for the analysis. Parameters related to both the first and second laws of thermodynamics are computed numerically using commercial software ANSYS FLUENT. The decreasing nozzle diameter layout provided the lowest value of the maximum wall temperature as well as a moderate hike in the pressure drop with respect to other cases. Similarly, a smaller nozzle angle is more suitable for better cooling than the larger nozzle angles.