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Influence of surface roughness on a spray cooling system with R134a. Part I: Heat transfer measurements
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2013 (English)In: Experimental Thermal and Fluid Science, ISSN 0894-1777, E-ISSN 1879-2286, Vol. 46, p. 183-190Article in journal (Refereed) Published
Abstract [en]

Experimental measurements in a spray cooling test rig were carried out for two different heater surface roughnesses and for two different types of nozzles with the dielectric refrigerant R134a. In this paper, results of the heat transfer measurements are presented. The analysis of the results explains the influence of the volumetric flow rate, the surface roughness and the type of nozzle (through the spray parameters) on the spray cooling boiling curve, on the Nusselt number and on the efficiency. It has been found that the effect of a smooth roughness is to delay the onset of the nucleate boiling, but once this regime has started, boiling is so fast that the CHF (Critical Heat Flux) is reached at lower heater temperatures and lower heat fluxes. In a companion paper the sprayed refrigerant film thickness measurements and its relation with the heat transfer measurements are presented.

Place, publisher, year, edition, pages
2013. Vol. 46, p. 183-190
Keywords [en]
Boiling curve, Experimental measurements, Heat transfer measurements, Heater temperatures, Spray cooling, Spray parameters, Test rigs, Volumetric flow rate
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-120276DOI: 10.1016/j.expthermflusci.2012.12.010ISI: 000315975600020Scopus ID: 2-s2.0-84873566092OAI: oai:DiVA.org:kth-120276DiVA, id: diva2:614873
Note

QC 20130408

Available from: 2013-04-08 Created: 2013-04-04 Last updated: 2017-12-06Bibliographically approved

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Language
  • de-DE
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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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