In this paper, a numerical study of quasi-nucleate boiling in horizontal mini- and micro-channels is carried out. The numerical simulation which is based on the multiphase model of volume of fluid (VOF) method available in commercial CFD software (Fluent 6.1.18) aims to study the corresponding flow behaviors of nucleate bubbles generated from the tube walls in mini/micro channels so as to understand the surface dominated effect of micro/mini channels on nucleate bubbles and heat transfer. In the present simulation, water enters a 2D channels with a uniform velocity of 0.2m/s. In order to examine the effects of channels size on bubbles flow and heat transfer, numerical simulations for three types of rectangular channels which have the same length of 30mm but different channel height respectively at 5mm, 0.5mm and 0.2mm are carried out. To have the nucleate effect or a quasi-nucleation condition, bubbles are generated approximately by injecting a small vapour bubble timely through an inlet located on the heated wall as the nucleate centre; meanwhile a transient vapour mass flow, based on the boiling parameters, is applied to approximate the bubble growth. While, the boiling parameters used in the simulation, such as bubble frequency, departure diameter and so on, are obtained by the calculations of correlations available from previous experimental studies.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
A Numerical Study of Quasi-Nucleate Boiling in Mini- and Micro Channels Available to Purchase
Y. Q. Zu
University of Nottingham, Nottingham, UK
Y. Y. Yan
University of Nottingham, Nottingham, UK
Paper No:
ICNMM2008-62112, pp. 585-591; 7 pages
Published Online:
June 11, 2009
Citation
Zu, YQ, & Yan, YY. "A Numerical Study of Quasi-Nucleate Boiling in Mini- and Micro Channels." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 585-591. ASME. https://doi.org/10.1115/ICNMM2008-62112
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