Experimental study of the effect of non-circular flow geometry on the critical heat flux

An experimental study of the effect of flow geometry (circular, rectangular, triangular, and dumb-bell shaped) on the critical heat flux (CHF) was performed using R-134a as a coolant. The CHF is affected by the following geometric parameters: hydraulic-equivalent diameter, healed length, gap size, channel shape, and curvature. It may also be affected by the thermal conductivity of the wall material and wall thickness. The effect of flow geometry on CHF is iniluenced by flow parameters. The effect of these parameters on CIIF was examined, and recommendations for predicting the CHF in non-circular geometrics have been made. © 1999 Elsevier Science S.A. All rights reserved.