Abstract
Boiling test results and theoretical evaluations related to predictive models for the boiling coefficient with porous coatings are critically surveyed. Consideration is limited to boiling pure fluids and coatings made of spherical particles of uniform diameter. The data for seven different porous coatings suggest that particle diameter has very little effect on performance. The preferred coating thickness is in the range of three to four particle diameters. Detailed consideration of cavity stability requirements suggests that a dynamic model is needed to rationally predict the boiling coefficient. A modified pore classification is proposed for use in the development of a dynamic model. The assumption and derivation of O'Neill's static boiling model is presented. Its ability to predict the boiling coefficient is evaluated by a comparison with the values predicted by an empirical correlation developed by Nishikawa and Ito.
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