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http://bura.brunel.ac.uk/handle/2438/27191| Title: | Influence of system pressure on flow boiling in microchannels |
| Authors: | Lee, VYS Karayiannis, TG |
| Keywords: | system pressure;microchannel;two-phase;heat transfer |
| Issue Date: | 7-Jul-2023 |
| Publisher: | Elsevier |
| Citation: | Lee, V.Y.S. and Karayiannis, T.G. (2023) 'Influence of system pressure on flow boiling in microchannels', International Journal of Heat and Mass Transfer, 215, 124470, pp. 1 - 13. doi: 10.1016/j.ijheatmasstransfer.2023.124470. |
| Abstract: | Copyright © 2023 The Authors. The effect of pressure on the flow boiling characteristics of HFE-7200 between 1.0 to 2.0 bar was investigated in a parallel microchannel heat sink (Dh = 0.48 mm, 44 channels). The mass flux and subcooling degree were kept constant at 200 kg/m2 s and 10 K respectively, while heat flux ranged from 26.1 – 160.7 kW/m2. Increasing system pressure decreased the vapour density ratio, thus leading to reduced pressure drop, increased bubble generation frequency and two-phase heat transfer coefficients in the system, though this may not be apparent at low superheat degrees at higher pressures. Smaller bubble diameters were observed at higher pressures and resulted in a delay in flow regime transition to slug flow, which is prone to flow reversal. The experimental work showed promising means to manage flow instabilities and enhance heat transfer performance in two-phase microchannel systems for HFE-7200. |
| Description: | Data availability:
Data will be made available on request. The authors would like to acknowledge the support of CPI TMD Technologies Division (formerly TMD Technologies Ltd.) and Mr Costas Xanthos of the Two-Phase Flow and Heat Transfer Group at Brunel University London for this work. |
| URI: | https://bura.brunel.ac.uk/handle/2438/27191 |
| DOI: | https://doi.org/10.1016/j.ijheatmasstransfer.2023.124470 |
| ISSN: | 0017-9310 |
| Other Identifiers: | ORCID iDs: Vivian Y.S. Lee https://orcid.org/0000-0002-5239-7762; Tassos G Karayiannis https://orcid.org/0000-0002-5225-960X. 124470 |
| Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| FullText.pdf | Copyright © 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/). | 3.56 MB | Adobe PDF | View/Open |
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