Heat transfer enhancement by bubble formation near the heating surface

The convective boiling heat transfer of an immiscible binary liquid mixture has been investigated by using water as a main fluid. R 113 and R 11 were atomized into the water as volatile material. When the boiling of the volatile material occurs the heat transfer is cohanced by the bubble formation near the heating surface. The heat transfer enhancement occurs by the addition of a small amount of volatile material, and is insensitive to further increases in its concentration. The enhancement is remarkable in the case of low Reynolds number. The heat transfer enhancement was also observed under the condition that gas bubbles were generated on the heating surface by electrolysis, and it was clarified that the enhancement is caused by the agitation effect of bubbles near the wall.