A theoretical model is developed to describe the hydrodynamic behavior of the vapor-liquid interface of a bubble at the heater surface leading to the initiation of critical heat flux (CHF) condition. The momentum flux resulting from evaporation at the bubble base is identified to be an important parameter. A model based on theoretical considerations is developed for upward-facing surfaces with orientations of 0 deg (horizontal) to 90 deg (vertical). It includes the surface-liquid interaction effects through the dynamic receding contact angle. The CHF in pool boiling for water, refrigerants and cryogenic liquids is correctly predicted by the model, and the parametric trends of CHF with dynamic receding contact angle and subcooling are also well represented.
A Theoretical Model to Predict Pool Boiling CHF Incorporating Effects of Contact Angle and Orientation
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division March 9, 2000; revision received April 23, 2001. Associate Editor: V. P. Carey.
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Kandlikar, S. G. (April 23, 2001). "A Theoretical Model to Predict Pool Boiling CHF Incorporating Effects of Contact Angle and Orientation ." ASME. J. Heat Transfer. December 2001; 123(6): 1071–1079. https://doi.org/10.1115/1.1409265
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