Instability, heat transfer and flow regime in a two-phase flow thermosyphon loop at different diameter evaporator channel
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
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.
Heat transfer, Flow regime, Instability, Two-phase thermosyphon loop, Electronic cooling, Natural circulation
IdentifiersURN: urn:nbn:se:kth:diva-27864DOI: 10.1016/j.applthermaleng.2010.01.024ISI: 000277856600004ScopusID: 2-s2.0-77950596370OAI: oai:DiVA.org:kth-27864DiVA: diva2:385831
QC 201101122011-01-122011-01-032011-01-12Bibliographically approved