EFFECT OF SHORT PIN FIN WITH DIFFERENT SHAPES AND ARRANGEMENTS ON THERMAL RESISTANCE OF MICRO HEAT SINK

In the present study, thermohydraulic characteristics of heat sinks with short micro pin fin (height of fin shorter than the total height of heat sink) of different shapes (square and elliptical) and different arrangements (interrupted and staggered) are studied, considering deionized water as the coolant. Experiments are conducted on silicon heat sink fabricated using wet etching. The pressure drop and temperature at different locations of micro pin fin heat sink are measured in the experiments. A numerical model is developed and validated with the experimental results with suitable boundary conditions. The numerical and experimental results show temperature variations in the inlet and outlet collectors of the micro pin fin heat sink due to conjugate heat transfer effects. The thermal resistance of three different arrangements is compared. It is found that the shape of the pin fin has a considerable effect on the thermal resistance as compared to the arrangement of a short pin fin in the micro heat sink.