A novel technique is described for investigating spray cooling of moving hot surfaces. An experimental investigation is described for vertically downwards water sprays impinging on a horizontal steel annulus of diameter with a surface temperature up to , and rotating at up to , giving a tangential velocity of . The central homogeneous zones of sprays from full-cone atomizers are used at pressures up to and the ranges of impacting spray parameters are for mass flux, for volume median drop diameter, and for impinging velocity (Yule, A. J., Sharief, R. A., and Nasr, G. G., 2000, “The Performance Characteristics of Solid Cone Spray Pressure Swirl Atomizers,” Ann. Tokyo Astron. Obs., 10(6), pp. 627–646). Time histories of the steel temperature, at positions within the annulus, are presented and analyzed to deduce the transient cooling as the instrumented section of the annulus was swept repeatedly under the spray. Discussion is provided on the physical processes occurring on the basis of the observations. Correlation equations derived to find relationships of surface heat flux with the spray and surface parameters provide further insight into these processes. The results confirm results for static surfaces, that droplet size is a relatively weak parameter, while droplet momentum flux and surface velocity are important. As the surface velocity is increased, peak heat transfer rate at the surface reduces, and its position moves downstream with respect to the spray centerline.
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Research Papers: Special Issue On Boiling And Interfacial Phenomena
High Pressure Spray Cooling of a Moving Surface
G. G. Nasr,
G. G. Nasr
Head of Spray Research Group (SRG), Institute of Materials Research (IMR), School of Computing, Science and Engineering,
e-mail: g.g.nasr@salford.ac.uk
University of Salford
, Manchester M5 4WT, UK
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R. A. Sharief,
R. A. Sharief
Department of Mechanical, Aerospace and Manufacturing Engineering,
UMIST
, P.O. Box 88, Manchester M60 1QD, UK
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A. J. Yule
A. J. Yule
Department of Mechanical, Aerospace and Manufacturing Engineering,
UMIST
, P.O. Box 88, Manchester M60 1QD, UK
Search for other works by this author on:
G. G. Nasr
Head of Spray Research Group (SRG), Institute of Materials Research (IMR), School of Computing, Science and Engineering,
University of Salford
, Manchester M5 4WT, UKe-mail: g.g.nasr@salford.ac.uk
R. A. Sharief
Department of Mechanical, Aerospace and Manufacturing Engineering,
UMIST
, P.O. Box 88, Manchester M60 1QD, UK
A. J. Yule
Department of Mechanical, Aerospace and Manufacturing Engineering,
UMIST
, P.O. Box 88, Manchester M60 1QD, UKJ. Heat Transfer. Aug 2006, 128(8): 752-760 (9 pages)
Published Online: June 24, 2005
Article history
Received:
May 13, 2003
Revised:
June 24, 2005
Citation
Nasr, G. G., Sharief, R. A., and Yule, A. J. (June 24, 2005). "High Pressure Spray Cooling of a Moving Surface." ASME. J. Heat Transfer. August 2006; 128(8): 752–760. https://doi.org/10.1115/1.2217747
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