J0103-4-4 Forced Convective Boiling Heat Transfer in Micro Channels

Abstract

Flow patterns and heat transfer characteristics of boiling two-phase flow of water in a flat microchannel have been experimentally examined. The test channel has a cross section of 0.5 x 10 mm^2 and a length of 162 mm. The heating section is set on the bottom wall at the middle of the channel. The length and width of the heating section are both 10mm. The boiling curves for two degrees of subcooling of about 25 and 55℃ are obtained. The video images of the flow recorded at 300 f/s reveals that a single vapor bubble grows in size both upstream and downstream staying on the heating surface and flows downstream at a time it gets large enough.