Observations of the Critical Heat Flux Process During Pool Boiling of FC 72

Abstract

Experimental work was undertaken to investigate the process by which poolboiling critical heat flux (CHF) occurs using an IR camera to measure the local temperature and heat transfer coefficients on a heated silicon surface. The wetted area fraction (WF), the contact line length density (CLD), the frequency between dryout events, the lifetime of the dry patches, the speed of the advancing and receding contact lines, the dry patch size distribution on the surface, and the heat transfer from the liquidcovered areas were measured throughout the boiling curve. Quantitative analysis of this data at high heat flux and transition through CHF revealed that the boiling curve can simply be obtained by weighting the heat flux from the liquidcovered areas by WF. CHF mechanisms proposed in the literature were evaluated against the observations.