Abstract
The present study investigates experimentally boiling heat transfer and two-phase flow in a micro heat sink with fifteen parallel micro-channels of 86.3μm hydraulic diameters under various mass flux and heat flux conditions. Bubble nucleation, bubble growth, two phase patterns and pressure drop are recorder and analyzed. Studying these phenomena is the key to understand the boiling process in the parallel micro-channels. In addition, it is found that the divergence pressure drop oscillation induces the instability of parallel micro-channels and the reversed flow affects the mode of bubble growth in slug flow. In addition, the wall superheat is dependent on the roughness of the heating surface parallel micro-channels.