Abstract
Experiments were carried out to explore the mechanisms of bubble lift-off from a vertical heated surface in subcooled pool boiling. The experiments were conducted at atmospheric pressure and distilled water was used as the test fluid. A high speed camera was used to observe bubble behavior. The main experimental parameters were the static contact angle of the heated surface, the liquid subcooling, and the wall heat flux. In this study, most bubbles were lifted off the heated surface immediately after nucleation to be collapsed in subcooled liquid. It was found that the bubble lift-off velocity in the perpendicular direction to the wall is in a strong correlation with the condensation rate of a bubble after the lift-off. A preliminary correlation was developed also for the bubble liftoff diameter considering the heat transfer around the bubble.
