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On the dynamics and heat transfer of bubble train in micro-channel flow boiling
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
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2017 (English)In: International Communications in Heat and Mass Transfer, ISSN 0735-1933, E-ISSN 1879-0178, Vol. 87, 198-203 p.Article in journal (Refereed) Published
Abstract [en]

The dynamics and heat transfer characteristics of flow boiling bubble train moving in a micro channel is studied numerically. The coupled level set and volume of fluid (CLSVOF) is utilized to track interface and a non-equilibrium phase change model is applied to calculate the interface temperature as well as heat flux jump. The working fluid is R134a and the wall material is aluminum. The fluid enters the channel with a constant mass flux (335 kg/m(2)*s), and the boundary wall is heated with constant heat flux (14 kW/m(2)). The growth of bubbles and the transition of flow regime are compared to an experimental visualization. Moreover, the bubble evaporation rate and wall heat transfer coefficient have been examined, respectively. Local heat transfer is significantly enhanced by evaporation occurring vicinity of interface of the bubbles. The local wall temperature is found to be dependent on the thickness of the liquid film between the bubble train and the wall.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 87, 198-203 p.
Keyword [en]
CFD, Boiling, Bubbles, Multi-phase flow, Micro-channels
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-217195DOI: 10.1016/j.icheatmasstransfer.2017.07.002ISI: 000413126100026Scopus ID: 2-s2.0-85027419329OAI: oai:DiVA.org:kth-217195DiVA: diva2:1154992
Funder
Swedish Energy Agency
Note

QC 20171106

Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2017-11-06Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
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  • nn-NB
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  • Other locale
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Output format
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  • asciidoc
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