高温ステンレスブロック体の急速冷却に与えるハニカム多孔質体とナノ粒子堆積層の影響

抄録

The quenching of high temperature stainless steel cylinder was investigated experimentally under the attachment of a honeycomb porous plate (HPP) on TiO2 nanoparticle deposited surface (NPDS). The experiments were performed under saturated conditions at atmospheric pressure. The results demonstrate that quenching was enhanced by HPP and/or NPDS in distilled water. Especially, for the case of HPP installed on the nanoparticle deposited surface, the time period from film boiling to nucleate boiling became extremely fast in distilled water. The enhanced quenching speed by the honeycomb porous plate was interpreted as liquid were supplied to the heated surface due to capillary action of the honeycomb porous plate. On the other hand, for the case of NPDS, the film boiling region disappears, and quenching speed was shortened. It was considered that these two effects combined are responsible for a shorter cooling time under the condition of HPP on NPDS.