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A theoretical and experimental study on subcooled flow boiling at high heat flux

Eine theoretische und experimentelle Studie über unterkühltes Sieden bei hoher Wärmestromdichte

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Abstract

In a subcooled flow boiling system at high heat flux, the major heat transfer mechanism places emphasis on a very thin liquid layer, known as the ‘sublayer’ which is trapped between the heated surface and the vapor blankets. Base on the convective boiling heat transfer dominated by the heat conduction through the liquid sublayer, a theoretical model for subcooled flow boiling heat transfer has been developed. To provide useful data in the simulation of Light Water Reactors (LWRs) conditions, heat transfer experiments for up-flow boiling water through a vertical tube at the pressure ranging from 6.9 to 15.5 MPa have been conducted. The experimental results are compared with the predictions of the present model and other five famous correlations. For the LWRs subcooled flow boiling, the comparison reveals that the present model show the best agreement with the measured data.

Zusammenfassung

In einem Fluidsystem, das bei hohem Wärmefluß den Effekt des unterkühlten Siedens zeigt, findet der wesentliche Wärmetransportmechanismus in einer sehr dünnen Schicht statt, die zwischen der beheizten Oberfläche und den Dampfpolstern liegt und als „Unterschicht“ bekannt ist. Basierend auf den Gesetzmäßigkeiten des konvektiven Siedens unter dominierendem Einfluß der Wärmeleitung durch die Flüssigkeits-Unterschicht wurde ein theoretisches Modell zu Beschreibung des Wärmeübergangs bei unterkühltem Sieden entwickelt. Um nützliche Daten für die Simulation der in Leichtwasserreaktoren (LWR) herrschenden Bedingungen zu gewinnen, erfolgten die Experimente bei Aufwärtsströmung siedenden Wassers in einem senkrechten Rohr im Druckbereich 6,9 bis 15,5 MPa. Diese experimentellen Ergebnisse werden mit Vorausberechnungen nach dem erstellten Theoriemodell, sowie jenen nach fünf der bekanntesten Korrelationen verglichen. Für unterkühltes Sieden in Leichtwasserreaktoren zeigte sich hierbei, daß die Experimente am besten durch das neuentwickelte Modell wiedergegeben werden.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chung Cheng Institute of Technology, Tashi, Taoyuan, Taiwan 33509, R.O.C.

    K. W. Lin

  2. Department of Mechanical Engineering, National Central University, Chungli, Taoyuan, Taiwan 32054, R.O.C.

    L. W. Hourng & J. C. Hsu

  3. Thermohydraulic Laboratory, Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan 32500, R.O.C.

    C. H. Lee

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  1. K. W. Lin
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  2. C. H. Lee
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  3. L. W. Hourng
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  4. J. C. Hsu
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Lin, K.W., Lee, C.H., Hourng, L.W. et al. A theoretical and experimental study on subcooled flow boiling at high heat flux. Warme - Und Stoffubertragung 29, 319–327 (1994). https://doi.org/10.1007/BF01578416

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  • DOI: https://doi.org/10.1007/BF01578416

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