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Influence of system pressure on the boiling heat transfer coefficient in a closed two-phase thermosyphon loop
KTH, Superseded Departments, Energy Technology.ORCID iD: 0000-0002-9902-2087
2002 (English)In: International journal of thermal sciences, ISSN 1290-0729, Vol. 41, no 7, 619-624 p.Article in journal (Refereed) Published
Abstract [en]

In recent years heat generation from electronic components has been rapidly increasing. Natural and forced convection air-cooled heat sinks are not well suited for cooling the components generating the highest heat fluxes. Other methods are therefore sought. Recently the use of thermosyphons has attracted attention as a simple and effective cooling system for high heat flux components. In a thermosyphon system the heat is absorbed during boiling and transferred as heat of vaporization from the hot part to the cold part of the system, with relatively small temperature differences. The setup used in this study consists of a thermosyphon loop, including evaporator, condenser, downcomer and riser. The loop has three evaporators, connected in parallel, made from small blocks of copper (10 x 20 x 15) mm in which five vertical channels with diameters 1.5 mm and length 15 min were drilled. Experimental results in terms of heat transfer coefficients at different system pressures and heat inputs are presented and compared to predictions of correlations from the literature. In all tests Isobutane is used as working fluid.

Place, publisher, year, edition, pages
2002. Vol. 41, no 7, 619-624 p.
Keyword [en]
thermosyphon, influence of pressure, heat transfer, two-phase, electronic cooling, tubes
URN: urn:nbn:se:kth:diva-21760ISI: 000177082700006OAI: diva2:340458
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Palm, Björn E.
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