2017 Volume 25 Issue 4 Pages 57-64
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 three modes: sensible heat transfer due to microscale convection, latent heat transfer due to liquid film evaporation, and transient conduction due to rewetting. Evaluated Nusselt number of the liquid film increased and that of the microscale convection decreased as the heat flux increased while that of the transient conduction has a peak value at moderate heat flux.