Bubble generation and heat transfer on flow boiling under dissolved air condition

Abstract

This paper deals with subcooled flow boiling experiments using various different dissolved air concentrations in the Perfluorohexane (PFH). To clarify its effects on the flow boiling heat transfer through a tube with an inner diameter of 4 mm, flow boiling experiments were conducted by varying levels of mass flux. As a result, dissolved air was shown to affect boiling characteristics. In particular, dissolved air significantly affected the boiling curve in the low heat flux region. Boiling curve of higher dissolved air concentration after onset of boiling has lower excess temperature than the lower dissolved air concentration. Furthermore, dissolved air effects were varied mass flux.