Please use this identifier to cite or link to this item: 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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