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POINT OF NET VAPOR GENERATION AND VAPOR VOID FRACTION IN SUBCOOLED BOILING

P. Saha
Georgia Institute of Technology School of Mechanical Engineering Atlanta, Georgia, USA

Novak Zuber
Division of Reactor Safety Research, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, Washington, D.C. 20555, USA

Abstract

An analysis is presented directed at predicting the point of net vapor generation and vapor void fraction in subcooled boiling. It is shown that the point of net vapor generation depends upon local conditions - thermal and fluid dynamic. Thus, at low mass flow rates the net vapor generation is determined by thermal conditions, whereas at high mass flow rates the phenomenon is hydrodynamically controlled. Simple criteria are derived which can be used to predict these local conditions for net vapor generation. These criteria are used then to determine the vapor void fraction in subcooled boiling. Comparison between the results predicted by this analysis and experimental data presently available, show good agreement for wide range of operating conditions, fluids and geometries.

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