Heat flux partitioning during pool boiling in a confined space derived from flow field and liquid layer structure

Abstract

This study reports a heat flux partitioning during pool boiling in a confined space derived from the flow field and the liquid film structure. The PIV method measured the flow field near a heat transfer surface and the backlighting method clarified the liquid film structure beneath bubbles. The total heat transport was evaluated as the Nusselt numbers of two modes: sensible heat transfer due to microscale convection and latent heat transfer due to liquid film evaporation. At relatively high heat flux, heat transport due to the liquid film evaporation played a dominant role. Evaluated Nusselt number of the liquid film increased and that of the microscale convection decreased as the heat flux increased.