Critical Heat flux in Forced Convective Subcooled Boiling with Multiple Impinging Jets (Effect of Subcooling)

Abstract

Critical heat flux (CHF) during forced convective subcooled boiling on a rectangular heated surface of 50 mm in length and 15 mm in width, which is supplied with subcooled liquids through multiple impinging jets of 2 or 4, has been studied experimentally employing water at two different pressures of 1 and 3 bar under a high subcooling condition of up to 80 K. The change in the flow aspect with increasing heat flux is similar to that observed in forced convective subcooled boiling with a single impinging jet, when focusing on the domain controlled by one of the multiple jets. The experimental result shows that the measured CHF is predicted well by a generalized correlation which can derive CHF in forced convective subcooled boiling with the single impinging jet. It is found that the characteristics of the CHF for the single jet and the multiple jets are identical in the domain controlled by one of the multiple jets. © 1995, The Japan Society of Mechanical Engineers. All rights reserved.