Abstract
The behavior of rewetting on high superheated surface, focusing on a wetted area and a contact angle during collapse of film boiling was investigated experimentally. In the experiments, a liquid jet from a nozzle was supplied on the superheated surface, made of a platinum wire, in the stable film boiling, and then the wetted area was observed. The experimental results showed that the propagative collapse of the vapor film occurred when the local wall temperature was below 300℃, i.e. The thermodynamic limit of superheat. The wetted area right after liquid-wall contact and the advancing velocity of the rewetting front increased as the initial wall superheat decreased. The measured angles between the liquid-vapor interfacial line and the heated wall corresponded to dynamic contact angle were close to the dynamic advancing contact-angles in room temperature.
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