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Influence of surface roughness on a spray cooling system with R134a. Part II: Film thickness 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, Vol. 48, 73-80 p.Article 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 sprayed refrigerant film thickness measurements are presented. The influence of the volumetric flow rate, the surface roughness and the type of nozzle (through the spray parameters) on the total average film thickness is analyzed and discussed. In a companion paper, results of the heat transfer measurements are presented. It has been found that there is a relation between the variations of the average Nusselt number and of the film thickness along the spray cooling boiling curve. The heat transfer regimes along that curve are related not only to a variation in the average Nusselt number but also to changes in the film thickness. The qualitative analysis of those variations served to better understand the heat transfer mechanisms occurring during the spray cooling.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 48, 73-80 p.
Keyword [en]
Spray cooling, Surface roughness, Film thickness measurements
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-124961DOI: 10.1016/j.expthermflusci.2013.02.010ISI: 000319536900010ScopusID: 2-s2.0-84876707386OAI: diva2:638800

QC 20130802

Available from: 2013-08-02 Created: 2013-08-02 Last updated: 2013-08-02Bibliographically approved

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Khodabandeh, Rahmatollah
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