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首页> 外文期刊>International Journal of Heat and Mass Transfer >Dynamic wetting and heat transfer characteristics of a liquid droplet impinging on heated textured surfaces
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Dynamic wetting and heat transfer characteristics of a liquid droplet impinging on heated textured surfaces

机译：撞击在加热的纹理表面上的液滴的动态润湿和传热特性

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摘要

This article reports the dynamic wetting behavior during spreading and receding phases and the heat transfer characteristics for impinging droplets on heated textured surfaces. In particular, the present study suggests newly the modified equations of the total thermal energy absorbed by droplet and the cooling effectiveness for textured surfaces with consideration of three different wetting states: non-wetting, partial-wetting and total-wetting states. Captured images by using the high-speed cameras were analyzed to examine the influence of impact Weber number, surface temperature, and texture area fraction. It was found that for the textured surfaces, the maximum contact diameter of impinged droplet decreased owing to decrease in the surface energy. At increased surface temperatures, the maximum contact diameters slightly increased and the maximum recoil diameters decreased because of change in liquid viscosity. For the textured surfaces, the cooling effectiveness increased with the Weber number and its change substantially depended on the wetting state. In case of the total-wetting state, the cooling effectiveness increased with the texture area fraction, because of change in liquid-solid interface area. It shows that the control of wetting state would be important in heat transfer of an impinging droplet on solid surface.
机译：本文报道了在铺展和后退阶段的动态润湿行为以及将液滴撞击在加热的纹理表面上的传热特性。特别地，本研究提出了考虑到三种不同的润湿状态：非润湿状态，部分润湿状态和全润湿状态的，液滴吸收的总热能和纹理表面的冷却效率的修正方程式。分析了使用高速相机拍摄的图像，以检查冲击韦伯数，表面温度和纹理面积分数的影响。已经发现，对于带纹理的表面，由于表面能的降低，撞击液滴的最大接触直径减小。在升高的表面温度下，由于液体粘度的变化，最大接触直径略有增加，最大反冲直径减小。对于有纹理的表面，冷却效率随韦伯数的增加而增加，其变化基本上取决于润湿状态。在全润湿状态下，由于液固界面面积的变化，冷却效率随织构面积分数的增加而增加。结果表明，润湿状态的控制对于固体表面撞击液滴的传热非常重要。

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