Pool boiling for water on surfaces with inclined microchannel

The heat transfer measurements were conducted during pool boiling of water on surfaces with microchannels. Parallel grooves were made on a copper surface with widths ranging from 0.2 mm to 0.5 mm at intervals of 0.1 mm. The inclination angle of the grooves to the horizontal was set at 30 degrees and 60 degrees, and the depth of the microchannel grooves was 0.3 mm. The achieved heat flux ranged from 25 kW/m 2 to 1730 kW/m 2 , and the heat transfer coefficients ranged from 12 kW/(m 2 K) to 475 kW/(m 2 K). The influence of geometric parameters such as width, inclination angle of the microchannel, surface extension, and Bond number on heat exchange efficiency was examined. A nearly sixfold increase in alpha (heat transfer coefficient) and a twofold increase in critical heat flux were observed compared to a smooth surface.