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Instability, heat transfer and flow regime in a two-phase flow thermosyphon loop at different diameter evaporator channel
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2010 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 30, no 10, 1107-1114 p.Article in journal (Refereed) Published
Abstract [en]

In this study, the influence of different channel geometries on heat transfer, flow regime and instability of a two-phase thermosyphon loop, is investigated. Instabilities in flow regime and heat transfer, at low and high heat fluxes, are observed. Bubbly flow with nucleate boiling heat transfer mechanism, confined bubbly/slug flow with backflow for small channel height (H) and finally slug/churn flow at high heat fluxes are observed. This study shows that flow and thermal instability increases as channel height (H) decreases and also heat transfer coefficient increases with increasing channel height and heat flux. Bubbly flow characterizes the flow regime at high heat transfer coefficients while confined bubbles, backflow and intermittent boiling are more significant for low channel heights with lower heat transfer coefficient and critical heat flux. (C) 2010 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2010. Vol. 30, no 10, 1107-1114 p.
Keyword [en]
Heat transfer, Flow regime, Instability, Two-phase thermosyphon loop, Electronic cooling, Natural circulation
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-27864DOI: 10.1016/j.applthermaleng.2010.01.024ISI: 000277856600004Scopus ID: 2-s2.0-77950596370OAI: oai:DiVA.org:kth-27864DiVA: diva2:385831
Note
QC 20110112Available from: 2011-01-12 Created: 2011-01-03 Last updated: 2017-12-11Bibliographically approved

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CiteExportLink to record
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