Abstract
This study reports simultaneous measurement of flow field and liquid layer thickness to evaluate sensible and latent heat transfer during pool boiling. Particle image velocimetry(PIV) captured flow field near a heat transfer surface and back light method clarified liquid layer structure beneath bubbles. A narrow pool sandwiched by two transparent plates was employed as a test section to constrain boiling bubbles for observation and illumination. PIV results illustrated bubble departure induced the flow toward the heat transfer surface and magnitude of the flow increased with the increasing heat flux. Liquid layer at relatively high heat flux covered the heat transfer surface widely and it was thinner than that at low heat flux. This indicates latent heat transfer with liquid layer evaporation played a dominant role at high heat flux. Simultaneous measurements revealed that temporal tendencies of sensible and latent heat transfer were strongly linked, and reached their peaks at bubble departure.
