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《Journal of Northeastern University(Natural Science)》 2004-04
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Effect of Spraying Direction on Heat Exchange in Spray Cooling Process

MEI Guo-hui, MENG Hong-ji, XIE Zhi (School of Information Science & Engineering, Northeastern University, Shenyang 110004, China. )  
A spray cooling model was set up taking the impact of spraying droplets as a disturbance due to film boiling in cooling pond, of which the effects of water flow density, droplet size and impact force were taken into account. It was also found that the difference between thickness of water film in different spraying directions is the main influencing factor of spraying direction on the heat-exchange coefficient of continuous-cast ingot surface. The thickness of water film was therefore introduced into the model to analyze the influence of spraying direction on heat-exchange coefficient. The results indicated that the heat-exchange coefficient is maximum if the spraying angle is 90° with ingot surface at low waterflow density and, as a while, the coefficient distribution is symmetrical to the perpendicular spraying direction if the angle is different from 90°. The coefficient will increase greatly with spraying angle if the waterflow density is high. The result, as a theoretical analysis, is much the same to existing works done in other ways.
【Fund】: 国家自然科学基金资助项目(50174021)·
【CateGory Index】: TK124
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