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Assessment of effect of bubble departure frequency in forced convection subcooled boiling

Situ, Rong, Tu, Jiyuan, Yeoh, Guan Heng, Hibiki, Takashi, & Park, Goon Cherl (2007) Assessment of effect of bubble departure frequency in forced convection subcooled boiling. In Jocobs, Peter, McIntyre, Tim, Cleary, Matthew, Buttsworth, David, Mee, David, Clements, Rose, et al. (Eds.) 16th Australasian Fluid Mechanics Conference, 2 - 7 December, Gold Coast, QLD, Australia.

Abstract

Bubble departure frequency is one of the important parameters for the prediction of subcooled flow boiling. This present work aims at an assessment of bubble departure frequency by investigating the physical mechanisms of three-dimensional two-fluid model coupled with the population balance equation. The CFX MUltiple-SIze-Group (MUSIG) model is used to predict bubbly flows with the presence of heat and mass transfer processes, particularly in subcooled boiling flows at low pressures. The assessment is carried out for these three models/correlations. The test shows that Podowski et al.'s model, with reasonable physical characteristics, is more realistic than the other two models when compared with the experimental data. The numerical results indicate that the higher the departure frequency, the lower the wall temperature and so the nucleation site density. In addition it is found that for both the axial and radial cases the curves of the void fraction tend to decrease with increase in departure frequency. The benchmark of the current numerical simulation with experimental data in both axial and radial profiles achieves successful agreement.

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ID Code: 11204
Item Type: Conference Paper
Additional Information: For more information, please contact the authors.
Keywords: Bubble departure frequency, two, fluid model, subcooled boiling, and forced convection
ISBN: ISSN: 9781864998948
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CLASSICAL PHYSICS (020300) > Fluid Physics (020303)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > INTERDISCIPLINARY ENGINEERING (091500) > Heat and Mass Transfer Operations (091505)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2007 QUT
Copyright Statement: This material is copyright but may be reproduced for the fair dealing purposes of research and study and any other purposes permitted by the Copyright Act 1968. Responsibility for the content of these papers rests upon the authors and not The University of Queensland. Data presented and conclusions developed by the authors are for information only and are not intended for use without independent substantiating investigation on the part of the potential user.
Deposited On: 19 Dec 2007
Last Modified: 29 Feb 2012 23:33

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