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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

COOLING OF HIGH - TEMPERATURE CYLINDRICAL SURFACE USING AN ARRAY OF WATER IMPINGEMENT JETS

Get access (open in a dialog) DOI: 10.1615/IHTC11.2190
pages 417-420

Аннотация

In materials processing such as heat treating, metal extrusion etc., there is a need to control the surface heat flux rate, in order to obtain better products. In the present work, the heat transfer from an high temperature cylinder, exposed to an array of impinging water jets, has been studied experimentally. A test model of 304 stainless steel tube, with an inside and outside diameters of 0.026 m and 0.032 m, respectively, was heated initially to 800 °C, and cooled by cooling water at 23 °C. The configuration of the cooling device was a square array of circular jets, with diameter of 1.5 mm each, which impinge the cylinder outer surface perpendicularly. The overall volumetric flow rate was in the range of 10 to 25 1/min.
The heat flux was calculated from the temperature response of the tube, by applying a lumped assumption. Experimental heat flux data and heat transfer coefficients are presented for different volumetric flow rates. It was found that as long as the jet impinge the tube perpendicularly, only one cooling regime of heat transfer process exists, in the whole temperature range. In regions of the tube in which the tangential flow dominated, other classical boiling regimes were detected.