The difference in flow pattern, heat transfer and pressure drop characteristics of mini-channel flow boiling in horizontal and vertical orientations
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Publication Details
Author list: Saisorn S., Wongpromma P., Wongwises S.
Publisher: Elsevier
Publication year: 2018
Journal: International Journal of Multiphase Flow (0301-9322)
Volume number: 101
Start page: 97
End page: 112
Number of pages: 16
ISSN: 0301-9322
eISSN: 1879-3533
Languages: English-Great Britain (EN-GB)
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Abstract
Flow pattern, heat transfer, and pressure drop data for different flow orientations was presented in this study. The data was obtained based on flow boiling experiments with R-134a flow through a 1 mm diameter channel which was aligned in different orientations, i.e. horizontal flow, vertical upward flow, and vertical downward flow. A constant surface heat flux condition was performed under a saturation pressure of 8 bar, a heat flux range of 1–60 kW/m2, and a mass flux range of 250–820 kg/m2s. The experimental results showed the importance of the change in the flow direction. The shape of the gas slug during horizontal flow did not look the same as in the vertical orientations. Heat transfer coefficient and pressure drop became increased when the refrigerant flowed in the vertical downward direction. The experimental data was also compared with the existing prediction methods. © 2018 Elsevier Ltd
Keywords
Mini-channel
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