2013 Fiscal Year Final Research Report

Visual Observation and Numerical Simulations of Transient Process on Limiting Liquid-Solid Contact on Superheated Surface during Impinging Jet Cooling

Research Project

Project/Area Number	23560222
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Thermal engineering
Research Institution	University of Fukui
Principal Investigator	NAGAI Niro 福井大学, 工学(系)研究科(研究院), 教授 (70251981)
Project Period (FY)	2011 – 2013
Keywords	濡れ開始 / 沸騰 / 固液接触 / MHF点 / 可視化
Research Abstract	During impinging jet cooling of high temperature surface, film boiling collapsed by initiating localized liquid-solid contacts on superheated surface. This criteria, i.e. wetting initiation condition, is very important related to steel manufacturing process and etc. This research tried to reveal this wetting initiation conditions by visual observation and numerical simulation of localized liquid-solid contact situations on superheated surface. As a result, in case of single crystal sapphire surface which has relatively high thermal diffusivity, the wetting initiaion condition was almost decided by "a certain surface temperature". However, in case of quartz glass which has relatively low thermal diffusivity, the condition was not decided only by the surface temperature, and further research will be necessary.