BOILING HEAT-TRANSFER IN THE MINIATURE AXIALLY-GROOVED RECTANGULAR CHANNEL WITH DISCRETE HEAT-SOURCES

An axially-grooved copper-water miniature heat sink with external dime nsions 2.6 x 7.7 x 40 mm has been tested in the horizontal orientation with heat fluxes on both side walls of up to 100 W/cm(2). The wall te mperature Variations along the heat sink, effective local heat transfe r coefficients, and important information on the critical heat Aux are presented. This heat sink provides a nearly uniform surface temperatu re, a low thermal resistance and operates with a significantly smaller pressure drop and larger heated length compared to single-phase heat sinks with microchannels. It can be used in two-phase thermal control systems applied to cooling of electronic components.