Abstract
Subcooled quasi-pool boiling has been performed for an aluminum heating block surface with 10mm diameter and a stainless steel plate surface with 30mm in length, 1mm in width and 0.1mm in thickness. A ceramics material of metal oxide is coated over the surfaces as a hydrophilic heating surface. The aluminum block surface is heated by cartridge heaters fitted inside the block, and the stainless steal plate is heated by DC and physically burned out. In the subcooled boiling with aluminum surface, the heat flux of hydrophilic surface increases higher than that of non-coated surface in high heat flux region of nucleate boiling. In the boiling of stainless plate, the bum-out heat flux of hydrophilic surface is about 150 percent higher than that of non-coated surface. Boiling bubbles generated on the hydrophilic surfaces are easy to detach from the surface and the detachment period is shorter than those of non-coated surfaces. The ceramics hydrophilic coating is strongly expected for the heat transfer enhancement in boiling.
