Effects of Operating Conditions on Evaporation Rate and Wall Shear Stress Development in a Micro-gap Heat Sink with Internal Micro-Fins

Evaporation in the micro-gap heat sink has a very high transfer coefficient. As result, it is significant for flux management. Heat rate can be enhanced further by including internal micro-fins. However, pressure drop penalty due to small gap height and fin surfaces major concern. Wall shear stress development responsible drop. This paper investigates effects of operating conditions, e.g., wall flux, pumping power, inlet void fraction, on evaporation with micro-fins rectangular triangular profiles, while cross-sectional area (21.8 mm2) kept constant. R-134a considered as coolant. Results show that from per unit volume increases increment decreases enhancement power. after threshold value power (2×10-4 W), decrement falls. Again, rises increasing reduces escalating fraction.