ICONE23-1458 AN INVESTIGATION ON MICROBUBBLE EMISSION BOILING PHENOMENON

Abstract

Microbubble emission boiling (MEB) occurs in some cases of subcooled boiling, accompanied by the emission of microbubbles from coalescing bubbles on heating surface and with much higher heat flux than that of conventional nucleate boiling. MEB was studied firstly by Inada et al. in 1981 and has attracted a great deal attention in recent years due to its extremely high heat dissipation capacity and potential application in thermal engineering. Investigations were conducted concerning MEB on a small heating surface as well as the condensation process of a single vapor bubble in a subcooled pool. Characteristics of MEB and the principles dominating the breakup of vapor bubbles on the heating surface was illustrated. It is speculated that the Marangoni convection induced surface wave might result in that the vapor film on the heating surface cannot sustain under a certain condition, leading to the occurrence of MEB.