Experimental study of heat transfer coefficient on hot steel plate during water jet impingement cooling |
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| Authors: | Hemu Wang Wei Yu Qingwu Cai |
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| Affiliation: | 1. Department of Chemical Engineering, IIT Kharagpur, 721302, India;2. Department of Mechanical Engineering, IIT Kharagpur, 721302, India;1. ABB AB, Corporate Research, SE-721 78 Västerås, Sweden;2. Mälardalen University, School of Business, Society & Engineering, P.O. Box 883, SE-721 23 Västerås, Sweden;1. University of Science & Technology Beijing, Beijing 100083, China;2. CISDI Chongqing Iron & Steelmaking Plant Integration Co., Ltd, Chongqing 400013, China;1. Department of Chemical Engineering, IIT Kharagpur, 721302, India;2. Department of Mechanical Engineering, IIT Kharagpur, 721302, India |
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| Abstract: | Experiments were performed, under transient conditions, to investigate the heat transfer phenomena of stationary hot steel plate under multiple top circular jets on run-out table. Based on inverse heat conduction model, a two-dimensional finite difference program was developed to calculate the local surface convective heat transfer coefficients and corresponding temperatures. The cooling water jet flow rate was varied from 15 L/min to 35 L/min and its effect on the convective heat transfer coefficient and surface temperature was analyzed. The results show that heat transfer coefficients are nonlinear functions of surface temperature. The cooling flow rate has no effect on heat transfer coefficient and surface temperature at stagnation point. Within 70 mm distance from stagnation line, heat transfer coefficient ratio changes slightly from 0.87 to 0.97. Beyond surface temperature of 350 °C, heat transfer coefficient ratio decreases with increasing distance from stagnation line. |
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