Homogeneous nucleation, although being discounted as a mechanism for vapor formation for water in most conditions, is found to possibly occur under some extreme conditions in subcooled flow boiling. Under the conditions, vapor bubbles of molecular dimensions generated in the superheated liquid adjacent to channel wall from homogeneous nucleation due to the local temperature exceeds homogeneous nucleation temperature. The condition is called in this paper as homogeneous nucleation governed condition. Under the condition, conventional flow pattern for subcooled flow boiling, which is characterized by the existence of Net Vapor Generation (NVG) point and the followed bubble detachment, movement and coalescence processes, cannot be established. Critical heat flux (CHF) triggering mechanism so far proposed, which employs a premise assumption that the conventional flow pattern has been established, such as liquid sublayer dryout model, is no more appropriate for the homogeneous nucleation governed condition. In this paper, first, the existence of the homogeneous nucleation governed condition is indicated. In the following, a criterion is developed to judge a given working condition as the conventional one or the homogeneous nucleation governed one. With the criterion, subcooled flow boiling data are categorized and typical homogeneous nucleation governed datasets are listed. The homogeneous nucleation governed data are characterized by extreme working parameters, such as ultrahigh mass flux, ultralow ratio of heated length to channel diameter or ultrahigh pressure. CHF triggering mechanism for the homogeneous nucleation governed condition is proposed and verified. Parametric trends of the CHF, in terms of mass flux, pressure, inlet subcooling, channel diameter, and the ratio of heated length to diameter are also studied.
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Ultrahigh CHF Prediction for Subcooled Flow Boiling Based on Homogenous Nucleation Mechanism
Wei Liu,
Wei Liu
Department of Energy Systems, Japan Atomic Energy Research Institute, Tokai, Ibaraki
, 319-1195, Japan Tel: 81-29-2826428
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Hideki Nariai
Hideki Nariai
Japan Nuclear Energy Safety Organization, Tokyo, 105-0001, Japan
Search for other works by this author on:
Wei Liu
Department of Energy Systems, Japan Atomic Energy Research Institute, Tokai, Ibaraki
, 319-1195, Japan Tel: 81-29-2826428
Hideki Nariai
Japan Nuclear Energy Safety Organization, Tokyo, 105-0001, Japan
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division November 24, 2003; revision received November 2, 2004. Review conducted by: M. K. Jensen.
J. Heat Transfer. Feb 2005, 127(2): 149-158 (10 pages)
Published Online: March 15, 2005
Article history
Received:
November 24, 2003
Revised:
November 2, 2004
Online:
March 15, 2005
Citation
Liu, W., and Nariai, H. (March 15, 2005). "Ultrahigh CHF Prediction for Subcooled Flow Boiling Based on Homogenous Nucleation Mechanism ." ASME. J. Heat Transfer. February 2005; 127(2): 149–158. https://doi.org/10.1115/1.1844536
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