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http://bura.brunel.ac.uk/handle/2438/31456
Title: | Flow boiling heat transfer in a single microchannel and comparison with correlations |
Authors: | Widgington, JJ Ivanov, A Karayiannis, TG |
Keywords: | microscale;flow boiling;heat transfer;flow patterns;correlations |
Issue Date: | 11-Jun-2025 |
Publisher: | Elsevier |
Citation: | Widgington, J.J., Ivanov, A. and Karayiannis, T.G. (2025) 'Flow boiling heat transfer in a single microchannel and comparison with correlations', International Journal of Heat and Mass Transfer, 251, 127388, pp. 1 - 22. doi: 10.1016/j.ijheatmasstransfer.2025.127388. |
Abstract: | The current research aimed to investigate the dominant heat transfer mechanisms during flow boiling of HFE-7100 in a single copper microchannel and use the data to assess predictive methods for the heat transfer coefficient. The single microchannel had a height of 0.811 mm, a width of 0.753 mm and a length of 75 mm, providing a hydraulic diameter of 0.7807 mm. Mass fluxes between 100 kg/m2s and 1000 kg/m2s were investigated for heat fluxes up to 204.74 kW/m2 at a constant inlet subcooling of 10 K. The inlet pressure was varied from 1, 1.5 and 2 bar. Four generic flow patterns were identified, namely: bubbly, slug, churn and annular flows, using a high-speed, high-resolution camera mounted on a microscope. Nucleate boiling was found to persist to some degree in all flow regimes. The effect of heat flux, mass flux and vapour quality on the two-phase heat transfer coefficient were considered and presented. The results were compared to existing heat transfer correlations. |
Description: | Data availability: Data will be made available on request. |
URI: | https://bura.brunel.ac.uk/handle/2438/31456 |
DOI: | https://doi.org/10.1016/j.ijheatmasstransfer.2025.127388 |
ISSN: | 0017-9310 |
Other Identifiers: | ORCiD: Joseph J. Widgington https://orcid.org/0000-0002-7066-5724 ORCiD: Atanas Ivanov https://orcid.org/0000-0001-8041-4323 ORCiD: Tassos G. Karayiannis https://orcid.org/0000-0002-5225-960X 127388 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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FullText.pdf | Copyright © 2025 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license ( https://creativecommons.org/licenses/by/4.0/ ). | 25.86 MB | Adobe PDF | View/Open |
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