Subcooled boiling with nano-coating heating surface

In this study, the effect of the nano-coating heating surface was examined to improve boiling heat transfer. A silane coupling agent, which produces self-assembled monolayer (SAM), was used to change the wettability on the heating surface. Since the coated thickness of SAM is very thin, it does not fill the cavity on the heating surface. By means of the nano-coating heating surface, boiling curve of pool boiling was investigated at the liquid subcooling of 50 K. As a result, a hydrophobic surface obtained by SAM improved the heat transfer coefficient in the nuclear boiling regime. Furthermore, it became clear that a heating surface coated with fluorinated silane copling agent did not prevent the occurrence of microbubble emission boiling (MEB).