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High pressure spray cooling of a moving surface

Nasr, GG, Sharief, RA and Yule, AJ 2006, 'High pressure spray cooling of a moving surface' , Journal of Heat Transfer, 128 (8) , pp. 752-760.

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Abstract

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 250 mm diameter with a surface temperature up to 600 °C, and rotating at up to 120 rpm, giving a tangential velocity of 1.35 ms–1. The central homogeneous zones of sprays from full-cone atomizers are used at pressures up to 2.07 MPa and the ranges of impacting spray parameters are 0.98 to 12.5 kg m–2 s–1 for mass flux, 49–230 µm for volume median drop diameter, and 9.8–32.3 ms–1 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.

Item Type: Article
Uncontrolled Keywords: Heat transfer, cooling, film cooling, high temperature, droplet, sprays and atomization
Themes: Subjects / Themes > Q Science > QD Chemistry
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Civil Engineering Research Centre
Journal or Publication Title: Journal of Heat Transfer
Publisher: American Society of Mechanical Engineers
Refereed: Yes
ISSN: 00221481
Depositing User: H Kenna
Date Deposited: 03 Sep 2007 15:00
Last Modified: 20 Aug 2013 16:47
URI: http://usir.salford.ac.uk/id/eprint/380

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