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Thermal-hydraulic performance evaluation of gas-liquid multiphase flows in a vertical sinusoidal wavy channel in the presence/absence of phase change
Amirkabir University of Technology, Department of Mechanical Engineering, Tehran, Iran.
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0002-6102-9021
2019 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 138, p. 677-689Article in journal (Refereed) Published
Abstract [en]

Turbulent gas-liquid multiphase flows with and without phase change in a vertical wavy channel are addressed. The multiphase flow field is resolved using the volume of fluid method (VOF), and the flow equations are discretized and numerically solved by the well-known finite volume method. As a multiphase system without mass transfer, air/water flow is considered. It is shown that numerical simulation is well capable of predicting the various multiphase flow regimes ranging from slug to bubbly flows inside wavy channels. Moreover, accurate predictions of overall pressure drop are provided by numerical solutions for various air and water flow rates and the phase shift angle between wavy channel walls. Additionally, condensing flows of refrigerant R134a are simulated inside wavy channels. It is found that for almost all the cases considered in the present study, the convective heat transfer coefficient is higher in wavy channels in respect to straight channels. However, a significant pressure drop penalty is observed especially for high mass fluxes across wavy channels. Therefore, the use of the wavy channels for the enhancement of condensing heat transfer is only advisable for low mass fluxes with the phase shift angle of 180°. © 2019 Elsevier Ltd

Place, publisher, year, edition, pages
2019. Vol. 138, p. 677-689
Keywords [en]
Thermal-hydraulic performance, Condensation, Volume of fluid, Wavy channel, Flow regime
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-13846DOI: 10.1016/j.ijheatmasstransfer.2019.04.084Scopus ID: 2-s2.0-85064546226OAI: oai:DiVA.org:hv-13846DiVA, id: diva2:1317962
Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-07-26Bibliographically approved

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Noori Rahim Abadi, Seyyed Mohammad Ali

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