Observation of Microbubble Emission Boiling

Abstract

Pool boiling heat transfer from a thin wire of which diameter is 0.2 mm to distilled water is experimentally studied under atomos-pheric pressure. Observation of boiling is made under the following two conditions; one is saturated boiling, and the other is subcooled boiling of which subcooling is 59.4 K. In case of subcooled boiling, microbubble emission is observed from a beginning of nucleate boiling regime to burnout point in the whole length of a thin wire.