Visualization Measurements and Heat Transfer Analysis of Initiation and Expansion Process of Localized Liquid-Solid Contact during Spray Cooling or Impinging Jet Cooling

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420142
• 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, 学術研究院工学系部門, 教授 (70251981)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 沸騰 / 固液接触 / MHF点 / 噴霧・噴流 / 可視化 / 濡れ開始

Outline of Final Research Achievements

During impinging jet cooling or spray cooling of high temperature surface, film boiling collapses by initiating localized liquid-solid contacts on superheated surface, and rapid cooling begins. 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 mainly by visual observation of localized liquid-solid contact situations and local surface temperature measurements on superheated surface. As a result, under experimental conditions tested in this research, the wetting initiation temperature was mostly ranged between spontaneous nucleation temperature and Leidenfrost temperature.

Free Research Field

伝熱工学