Abstract
For liquid-liquid direct-contact heat transfer with evaporation, a method for nucleation in a dispersed-phase drop is studied experimentally. The evaporation of the water drop in silicone oil stops during the evaporation, because the unvaporized water drop separates from the vapor bubble. In order to continue the evaporation, the nucleus must be supplied again. It is known that a charged-drop in oil with uniform electric field collides with an electrode plate by turns and exchange the charge, and shuttles between two electrode plates. If the nucleus can be supplied on the electrode plate, evaporation is initiated in the collision. The effectiveness of this method has been verified experimentally. It is clarified that the electrode plate surface scratched by an abrasive paper is effective for giving the nucleus. The effect of the degree of superheat of the silicone oil on relative frequency of initiation of evaporation is also shown.
