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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental study of droplet impact on superheated cylindrical surfaces
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Experimental study of droplet impact on superheated cylindrical surfaces

机译：液滴冲击对超热圆柱表面的实验研究

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摘要

In this study, droplet impact dynamics on superheated cylindrical surfaces are investigated experimentally, through high-speed imaging. The outcome regimes of impacting droplets observed in the experiments are mapped and described. Four distinguishable regimes are identified, namely rebound-transition boiling, rebound film boiling, breakup-transition boiling, and breakup-film boiling. In addition, the effects of Weber number, surface temperature and curvature diameter on boiling mode, film thickness, droplet spreading and contact time are examined. The scaling laws of maximum spreading ratio and liquid film thickness with the impact Weber number are established. The larger film thickness on the concave surface reduces the dynamic Ledifenfrost temperature, meanwhile improves the critical Weber number for droplet breakup. Under the effect of the tangential gravity component, the spreading of droplets in the circumferential direction is suppressed on the concave surface, while is promoted on the convex surface. Increasing the curvature diameter, the maximum spreading increases on the concave surface, but decreases on the convex surface. The maximum spreading on both surfaces decreases with the wall temperature in the transition boiling state. Noticeable reduction in the contact time of droplets in the rebound regimes are observed on both surfaces, especially on the concave surface. The contact time is shown to generally decrease with the wall temperature, but increase with the curvature diameter.
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