A Study on Surface Rewet Caused by Uniform Collapse of Flow Film Boiling

Abstract

An experiment was performed on hot surface rewetting caused by the collapse of film boiling of R-113 flow in a 10 mm. I. D. circular passage through a copper block. Temperatures in the copper block during the cooling process were measured by thermocouples embedded in it. By solving the heat conduction equation in the block, boiling curves were obtained. In the flow boiling system, while heat transfer characteristics and rewetting mechanism changed according as the flow pattern changed with the flow quality, the wall superheat at the onset of surface rewetting as well as that at quenching was almost constant.