ミニチャネル内における微細構造付き伝熱面の流動沸騰熱伝達

抄録

In this study, we investigated the influence of the surface wettability on behavior of thin liquid film in the minichannel boiling and heat transfer characteristics. In the air bubble injection experiment under adiabatic condition, the liquid-repellent-type dry-out, where a thin liquid film on the wall ruptures and then the nucleated dry-patch expands without heating, was observed on the bare silicon surface with the contact angle of 50°. On the other hand, the liquid-repellent-type dry-out was not observed on the superhydrophilic surface. The minichannel boiling experiment using the superhydrophilic surface fabricated by wet-etching and chemical oxidation was conducted, and the superhydrophobic surface was found effective to prevent the liquid-repellent-type dry-out that potentially deteriorate the heat transfer coefficient.