In the present study, the influence of surface roughness ( R a ) on critical heat flux (CHF) of water at pressure of 1, 5, and 10 bar is investigated. The desired value of R a is achieved by making unidirectional scratches on the flat copper surface. Surface roughness R a varies from 0.106 to 4.03    μ m . The high-speed camera of 1000 fps is used for the boiling visualization study. The effect of surface roughness on bubble departure diameter and bubble frequency at different pressure is reported. Kim’s CHF model is modified to include the contact angle as a function of surface roughness and temperature, which predicts the experimental CHF with mean absolute error (MAE) of 10.50% at pressure up to 10 bar. The correlation developed for bubble departure diameter predicts the experimental values with MAE of 17.09%. The relation between bubble departure diameter and bubble frequency is also developed, which predicts the corresponding experimental values with MAE of 25.26%.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Bubble Dynamics and Enhanced Heat Transfer During High-Pressure Pool Boiling on Rough Surface


    Beteiligte:
    Walunj, Avdhoot (Autor:in) / Sathyabhama, A. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.04.2019




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Single-Bubble Dynamics During Pool Boiling Under Low Gravity Conditions

    D. M. Qiu / V. K. Dhir / D. Chao et al. | AIAA | 2002


    AIAA-2001-4995 Bubble Dynamics and Heat Transfer Associated with Pool Nucleate Boiling Under Microgravity Conditions

    Dhir, V. / Qiu, D.-M. / Chao, D. et al. | British Library Conference Proceedings | 2001


    Pool Boiling: Single Bubble Experiment, First Results

    Vogel, B. / Straub, J. | British Library Online Contents | 1993


    Bubble dynamics in nucleate pool boiling on thin wires in microgravity

    Zhao, J.F. / Liu, G. / Wan, S.X. et al. | Tema Archiv | 2008