Developed boiling heat transfer : physical models, correlations and lines of further research

Abstract

Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.

A keynote lecture discusses current status of research of developed boiling heat transfer. An analysis of the main experimental facts, physical models and correlations of experimental data on heat transfer coefficient (HTC) is carried out. Exclusive character of developed boiling heat transfer law resulted by control of HTC by thermodynamic conditions on nucleation sites (a model of “the theatre of director” (MTD)) is highlighted. MTD-based correlation is discussed and the results of comparison with wide experimental data on HTC during developed boiling of all types of liquids (water, organic liquids, refrigerants, cryogenic liquids, liquid metals) are presented (without dividing of liquids into groups and without matching different constants and powers to different surface-fluid combinations). Unified interpretation of developed boiling heat transfer mode and diverse specific boiling heat transfer regimes (including boiling heat transfer hysteresis) is offered based on MTD and multi-factoring concept (MFC). Finally, the ways of further research of the boiling problem are discussed.