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http://dx.doi.org/10.3795/KSME-B.2004.28.3.247

A Study on Cooling of Hot Steel Surface by Water-Air Mixed Spray(I) -The Effect of Air Mass Flux on Film Boiling Heat Transfer-  

Lee, Pil-Jong (포스코 기술연구소 공정제어 연구그룹)
Jin, Sung-Tae (부산대학교 기계공학과 대학원)
Lee, Sung-Hong (부산대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.3, 2004 , pp. 247-255 More about this Journal
Abstract
The cooling characteristic of water-air mixed spray for high water mass flux is not well defined, compared to that of highly pressurized spray. A series of research program was planned to develop the boiling correlation for whole temperature range in case of water-air mixed spray with high water mass flux. The cooling experiments of hot steel surface with initial temperature of 820$^{\circ}C$ were conducted in unsteady state with relatively high water mass flux. A computer program was developed to calculate the heat flux inversely from measured data by three inserted thermocouples. Finally the effects of water and air mass flux on the averaged film boiling heat flux and wetting temperature were studied. In this 1st report, it is found that the boiling curve was similar to that of highly pressurized spray and the decreased slope of heat flux in film boiling region with respect to surface temperature became steep by increasing air mass flux. Also it is shown that, by increasing air mass flux, the averaged heat flux in film boiling region was increased, and then saturated and the wetting temperature was increased, and then decreased. Finally when the heat flux in film boiling region is compared with that of highly pressurized spray, it is known that the cooling is improved by introducing air up to 60%.
Keywords
Water-Air Mixed Spray; Hot Steel Plate; Film Boiling; Air Mass Flux; Water Mass Flux;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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