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Atomization and Sprays

Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

Institutional price:	$787.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2007, Volume17

98 pages

Issue price - $109.00

STEADY-STATE HIGH-PRESSURE SPRAY COOLING OF HIGH-TEMPERATURE STEEL SURFACES

R. A. Sharief
Department of Mechanical & Aerospace Engineering, Thermo Fluid Division, UMIST, George Begg Building, Manchester, UK

G. G. Nasr
Spray Research Group (SRG), Insititute of Materials Research (IMR), School of Computing, Science and Engineering, University of Salford, Manchester, UK

Andrew J. Yule
Spray Research Group (SRG), Insititute of Materials Research (IMR), School of Computing, Science and Engineering, University of Salford, Manchester, UK

ABSTRACT

Water-spray cooling of heated surfaces is common in many industrial applications, notably steelmaking, because of its high heat dissipating ability. Quantitative information regarding the parameters affecting spray cooling is relatively scarce. The objective of this research is to obtain such information by using a specially developed experimental technique that provides steady-state cooling of a steel surface using a gas-fired burner to introduce heat. The method provides fundamental information on the spray parameters controlling heat transfer from horizontal heated surfaces for a wide range of mass flux and droplet size and velocity in the film-boiling regime. Measurements are made of the drop sizes and velocities and of the liquid mass flux in the sprays produced by full-cone pressure atomizers. Heat transfer characteristics in the range of surface temperature between 380 K and 1200 K are investigated. Comparisons are made with published data and correlations are developed for heat flux and Nusselt number in the surface temperature range from 800 to 1200 K. It is found that drop size has only a weak effect on heat transfer in these relatively dense sprays. However, droplet velocity is almost as important as mass flux, so that the product of mass flux and velocity, the impinging momentum flux of water, is the dominant parameter.