Nanocavity at Solid-liquid Interface and Boiling Enhancement

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630068
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Thermal engineering
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: Nagayama Gyoko 九州工業大学, 大学院工学研究院, 准教授 (60370029)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 沸騰伝熱 / 分子動力学解析 / 固液界面 / ナノ・マイクロキャビティ / 濡れ性 / 核生成理論

Outline of Final Research Achievements

Evidence of the existence of nanobubbles have been provided by both the non-equilibrium molecular dynamics simulations and the experiments. Bubble occurs at the solid-liquid interface with ununiform surface energy distribution but not totally depends on the structured cavity. For a surface or a structured surface with uniform surface energy distribution, the phase change of liquid to vapor only occurs at the liquid-vapor interface as evaporation. The growth and the departure of the initial bubble seem to be independent on the cavity size or shape, but depends on the density of nanocavity and the degree of superheating and subcooling. The mechanism of boiling enhancement at nanocavity surfaces can be explained as the enhancement of the bubble coalescence due to the increased density of nucleation sites.

Free Research Field

熱工学