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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

THE BEHAVIOR OF WETTED AREA AND CONTACT ANGLE RIGHT AFTER LIQUID-WALL CONTACT IN SATURATED AND SUBCOOLED POOL BOILING

Get access (open in a dialog) DOI: 10.1615/IHTC13.p28.390
8 pages

Аннотация

The behavior of rewetting on high superheated surface, focusing on a wetted area and a contact angle during collapse of saturated and subcooled 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 of ΔTsub = 0K or 15K, then the wetted area was observed. The experimental results showed that the propagation collapse of the vapor film occurred when the local wall temperature was below near thermodynamic limit of liquid superheat. 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 in spite of a difference of liquid temperature. The dynamic contact-angles were examined analytically using a Wayer's model.