Abstract
Heat transfer characteristics were experimentally examined in the field where a volatile liquid pool of per-fluorocarbon PF5050 (boiling point 306 K) was directly in contact with an immiscible hot water pool. Heat was supplied to a horizontal continuous liquid-liquid (LL) interface by downward hot water jet flow. Bubble incipience occurred with a thin PF5050 liquid film atop growing bubbles. Characteristics of bubble departure from the droplets were discussed based on comparison with Mersmann's formula. On heat transfer, curvature of the liquid-liquid interface controlling the bubble departure sizes had a predominant effect in both droplet and LL cases. Heat transfer characteristics could be explained based on this result, by using Weber number and buoyancy-interfacial tension ratio.
