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Pressure drop in riser and evaporator in an advanced two-phase thermosyphon loop
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2005 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 28, no 5, 725-734 p.Article in journal (Refereed) Published
Abstract [en]

This study presents an experimental investigation of pressure drop in the evaporators and the riser of an advanced thermosyphon loop. The thermosyphon was designed for the cooling of three parallel high heat flux electronic components. The tested evaporators were made from small blocks of copper in which 7, 5, 4, 3, 2, 1 vertical channels with the diameters of 1.1, 1.5, 1.91 2.5, 3.5 and 6 mm, respectively, and a length of 14.6 mm were drilled. Tests were done with isobutane at heat fluxes ranging between 22.4 and 303 kW/m(2). For prediction of the pressure drop, in the riser, different combinations of frictional pressure drop and void fraction correlations were tested. Regarding the evaporator a simple correlation based on a homogeneous model [M.B. Bowers, I. Mudawar, Two-phase electronic cooling using mini-channel and macro-channel heat-sinks-part 11, flow rate and pressure drop constraints, ASME J Electron Packaging H 6 (1994) 298-305. [1]] has been used to predict the pressure drop.

Place, publisher, year, edition, pages
2005. Vol. 28, no 5, 725-734 p.
Keyword [en]
thermosiphon, evaporator, R600a, cooling, liquid, experiment, pressure, drop, correlation, flow
URN: urn:nbn:se:kth:diva-14873DOI: 10.1016/j.ijrefrig.2004.12.003ISI: 000230183000010ScopusID: 2-s2.0-20144371352OAI: diva2:332914
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Khodabandeh, Rahmatollah
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