Abstract

The influence of test section orientation on boiling crisis occurring in a tube has been studied experimentally. The same tube was tested with both water and Freon-12 to determine the effects of fluid properties and the applicability of vertical fluid-to-fluid modelling criteria to horizontal flow. At low mass flux the critical heat flux (CHF) was lower in horizontal flow than in vertical: however, this degradation decreased with increasing mass flux. Vertical CHF modelling criteria were found to be inapplicable to horizontal flow. Upstream boiling crisis was observed throughout the mass flow range in horizontal flow; however, in vertical flow this phenomenon was confined to high mass flux.

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