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Numerical study of the interactions and merge of multiple bubbles during convective boiling in micro channels
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0002-9902-2087
2017 (English)In: International Communications in Heat and Mass Transfer, ISSN 0735-1933, E-ISSN 1879-0178, Vol. 80, p. 10-17Article in journal (Refereed) Published
Abstract [en]

Multi bubbles interaction and merger in a micro-channel flow boiling has been numerically studied. Effects of mass flux (56, 112, 200, and 335 kg/m2 ∗ s), wall heat flux (5, 10, and 15 kW/m2) and saturated temperature (300.15 and 303.15 K) are investigated. The coupled level set and volume of fluid (CLSVOF) method and non-equilibrium phase model are implemented to capture the two-phase interface, and the lateral merger process. It is found that the whole transition process can be divided to three sub-stages: sliding, merger, and post-merger. The evaporation rate is much higher in the first two stages due to the boundary layer effects in. Both the mass flux and heat flux affect bubble growth. Specifically, the bubble growth rate increase with the increase of heat flux, or the decrease of mass flux.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 80, p. 10-17
Keywords [en]
Boiling, Bubbles, CFD, Evaporation, Heat transfer, Micro-channels, Multi-phase flow, Boiling liquids, Boundary layers, Bubbles (in fluids), Computational fluid dynamics, Mergers and acquisitions, Merging, Numerical methods, Phase interfaces, A coupled level set and volume of fluid methods (CLSVOF), Boundary layer effects, Convective boiling, Microchannel flow, Non-equilibrium phase, Saturated temperatures, Transition process, Two-phase interfaces, Heat flux
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-202262DOI: 10.1016/j.icheatmasstransfer.2016.11.009ISI: 000392678800002Scopus ID: 2-s2.0-84999106945OAI: oai:DiVA.org:kth-202262DiVA, id: diva2:1075845
Note

Funding text: The support of the Swedish Energy Agency through its research program Effsys Expand is gratefully acknowledged. QC 20170221

Available from: 2017-02-21 Created: 2017-02-21 Last updated: 2017-06-29Bibliographically approved

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