Abstract
This study experimentally investigates the flow boiling of water within a micro-channel heat sink with a hydraulic diameter of 570 μm and fixed the outlet pressure at 110 kPa. The boiling tests are carried out for the mass flux from 110 to 200 kg/m2s, the vapor mass quality from 0.1 to 0.6, the heat flux from 100 to 200 kW/m2 and the inclined angle from -90°(vertical downward) to 90°(vertical upward). The results show that pressure drops increase as mass flux and quality increase, and the effect of inclination is not significant due to the variation less than 15%. For the mass flux of 110 kg/m2s, the heat transfer coefficients will decrease as the quality increases. However, there are some special results for -90 °vertical downward flow. On the contrary, the heat transfer coefficients of 200 kg/m2s will increase with the quality. The best heat transfer coefficient occurs at -90 °vertical downward flow with high quality.