Abstract
This study has been investigated characteristics of phase change heat transfer at the liquid-vapor interface around a boiling bubble using laser interferometry. Initially, to evaluate measurement accuracy of the used interferometric temperature measurement technique, a temperature field of a liquid phase around a heated fine wire was measured and the temperature data was compared to the result of a transient heat conduction simulation. It was indicated that laser interferometry was available for temperature measurement in fast and local heat transfer phenomena such as liquid phase heat transfer in boiling. In the boiling experiment, temperature field around a spherical bubble growing in the depressurized and superheated water was measured. Thin evaporative thermal boundary layer which had 50 μm thickness at 5 ms from the nucleation was successfully captured as deformation of interference fringes in the vicinity of the liquid-vapor interface.
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