Boiling Heat Transfer in an Open Thermosyphon : Report 2, The Influence of the Physical Property on a Heat Transfer Coefficient and on a Critical Heat Flux

Abstract

Experiments on a heat transfer coefficient and a critical heat flux in a vertical open thermosyphon are performed. Tubes and annuli are used as the channel of the open thermosyphon. The latter consists of an unheated core and an externally heated tube. Pure water, ethyl-alcohol, normal-hexane, carbon-tetrachloride and sodium oleate aqueous solution are used as test liquids. Data are obtained with different lengths and diameters of the tube, diameters of the core and entrance fluid temperature of the thermosyphon. The experimental results are correlated on the basis of dimensional analysis and experimental expressioins are presented.