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

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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.