In recent years several correlations have been proposed for calculating the heat-transfer coefficient during condensation in circular and non-circular channels of typical dimension around 1 mm where surface tension effects are important and correlations for larger diameter channels are inappropriate. A wholly theoretical approach applicable to annular flow has also been proposed. The correlations are all based on data for R134a, while the theory is applicable to any fluid. In this paper comparisons are made between the correlations for R134a and ammonia; plots based on theory are also included. Fair agreement is seen between all calculation methods for R134a but wide differences are seen for ammonia indicating that the correlations, based only on one fluid, do not capture the fluid property dependence accurately.
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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
Correlations and Theory for Microchannel Condensation
Qian Su,
Qian Su
Hyder Consulting Pty Ltd, Sydney, NSW, Australia
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Guang Xu Yu,
Guang Xu Yu
Queen Mary, University of London, London, UK
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Hua Sheng Wang,
Hua Sheng Wang
Queen Mary, University of London, London, UK
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John W. Rose
John W. Rose
Queen Mary, University of London, London, UK
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Qian Su
Hyder Consulting Pty Ltd, Sydney, NSW, Australia
Guang Xu Yu
Queen Mary, University of London, London, UK
Hua Sheng Wang
Queen Mary, University of London, London, UK
John W. Rose
Queen Mary, University of London, London, UK
Paper No:
ICNMM2008-62146, pp. 593-599; 7 pages
Published Online:
June 11, 2009
Citation
Su, Q, Yu, GX, Wang, HS, & Rose, JW. "Correlations and Theory for Microchannel Condensation." 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. 593-599. ASME. https://doi.org/10.1115/ICNMM2008-62146
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