A bubble mechanistic model for subcooled boiling flow predictions
No Thumbnail Available
Date
2010-08-17
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis
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, interfacial area concentration, bubble population density, and gas and liquid velocities covering a range of different mass and heat fluxes and inlet subcooling temperatures. Good agreement is achieved with the local radial void fraction, bubble Sauter diameter, interfacial area concentration, bubble population density, and liquid velocity profiles against measurements. However, further improvement is needed for the accurate prediction of the vapor velocity using the present bubble mechanistic model. A proposal to include an algebraic slip model to account for bubble separation in the MUSIG boiling model is presented. © 2022 Informa UK Limited
Description
Keywords
Equations, Nucleation, Annular space, Vapor condensation, Bubbles, Boiling detection, Subcooled boiling, Void fraction
Citation
Yeoh, G. H., & Tu, J. Y. (2004). A bubble mechanistic model for subcooled boiling flow predictions. Numerical Heat Transfer, Part B: Fundamentals, 45(5), 475-493. doi:10.1080/10407790490268959