ENHANCEMENT OF LIQUD FORCED CONVECTION HEAT TRANSFER IN MICROCHANNELS DUE TO THE RELEASE OF DISSOLVED NONCONDENSABLES

摘要

An experimental investigation addressing the effect of the release of dissolved noncondensables on the heat transfer in a long, heated microchannel subject to subcooled liquid forced convection was conducted. The convection heat transfer coefficients near the exit of a copper microchannel with 0.76 mm inner diameter and 16 cm heated length, subject to forced-flow cooling by subcoolu0005d water, were measured. The range of experimental parameters were :wall heat flux=0.5-2.5MW/m~2, liquid velocity=2.07 to 8.53m/s; channel exit pressure=5.9 bar. Experiments were performed with degassed water and water saturated with air.