Local prediction of subcooled boiling flow in an annular channel with the influence of bubble coalescence and break-up mechanisms
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Date
2003-03-24
Journal Title
Journal ISSN
Volume Title
Publisher
International Group On Research Reactors
Abstract
Population balance equations combined with a three-dimensional two-fluid model are employed to
predict subcooled boiling flow at low pressure in a vertical annular channel. The MUSIG (MUltiple-SIze-
Group) model implemented in CFX4.4 is extended to account for the wall nucleation and condensation in
the subcooled boiling regime. Comparison of model predictions against local measurements is made for
the void fraction, bubble Sauter diameter and gas and liquid velocities covering a range of different mass
and heat fluxes and inlet subcoolings. Good agreement is achieved with the local radial void fraction,
bubble Sauter diameter and liquid velocity profiles against measurements. However, significant
weakness of the model is evidenced in the prediction of the vapour velocity. Work is in progress to
overcome the deficiency of the extended MUSIG model by the consideration of an algebraic slip
model to account for bubble separation.
Description
Keywords
Bubbles, Flow rate, Heat flux, Mass transfer, Nucleation, Subcooled boiling, Three-dimensional calculations, Void fraction
Citation
Yeoh, G. H., Tu, J. Y., & Li, Y. Z. (2003). Local prediction of subcooled boiling flow in an annular channel with the influence of bubble coalescence and break-up mechanisms. Paper presented to IGORR 9 (9th Meeting of the International Group of Research Reactors), 24-28 March 2003, Sydney, Australia. Retrieved from: https://www.igorr.com/Documents/2003-SYDNEY/Yeoh.pdf