Numerical Study on Dynamic Behavior Characteristics of Water Droplets Hitting Inclined Non-Newtonian Deicing Liquid Films
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摘要: 为了探究降雨天气下水滴撞击除冰液液膜后引发的非Newton动力学行为，耦合相界面控制方程及组分输运方程，构建了多相、多组分、多体系耦合作用的液滴撞击非Newton液膜的动力学行为模型.开展了水滴撞击除冰液液膜非稳态演化行为特性数值研究，以实验结果验证并修正了模型.此外，进一步分析了除冰液的剪切稀化特性和斜面坡度对撞击过程的影响机制.研究结果表明：液滴撞击倾斜液膜后会产生非对称的液冠，而除冰液非Newton特性引发的黏度差异进一步导致撞击后的非对称运动；在液冠的形成过程中，除冰液被带离液膜，与水分的稀释效应共同降低了液膜的黏度；坡度的增加限制了水滴在液膜上游的作用范围，促进了下游液冠的生长进而加快了除冰液的脱离，因此液膜在下游的黏度显著降低.Abstract: To investigate the non-Newtonian dynamic behavior of water droplets hitting deicing fluid films under rainy weather conditions, the phase interface control equation was coupled with the component transport equation to construct a dynamic behavior model for multi-phase, multi-component and multi-system coupling actions of droplets hitting non-Newtonian liquid films. The non-steady-state evolution characteristics of water droplets hitting deicing fluid films were numerically studied, and the model was validated and modified based on experimental results. Furthermore, the influence mechanisms of shear-thinning characteristics of the deicing fluid and slope gradients on the impact process were further analyzed. The results indicate that, an asymmetric liquid crown will form after a droplet impacts the inclined liquid film. The viscosity disparity resulting from the non-Newtonian characteristics of the deicing liquid further contributes to the asymmetrical motion following the impact. During the formation of the liquid crown, the deicing liquid is taken away from the film, and the dilution effect of water reduces the film viscosity. Increasing the slope restricts the upstream range of water droplets, facilitating the growth of the downstream liquid crown and accelerating the deicing of the film. Consequently, the viscosity of the downstream liquid film significantly decreases.
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Key words:
- deicing liquid /
- shear thinning /
- component transport /
- slope
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图 2 液滴撞击倾斜液膜
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.
Figure 2. The droplet striking the tilting liquid film
图 5 中心点8 mm范围内液膜的黏度变化
Figure 5. Changes in viscosities of the liquid film within 8 mm of the center point
图 6 水滴撞击不同坡度的倾斜液膜的动态过程
Figure 6. Dynamic processes of water droplets hitting inclined liquid films of different slopes
图 7 不同坡度下液冠半径随时间的变化
Figure 7. Changes of liquid crown radii over time for different slopes
表 1 材料物性参数
Table 1. Physical parameters of materials
parameter deicing fluid water density ρ/(kg/m3) 1 150 998 viscosity μ/(Pa·s) 0.5~3 0.001 surface tension σ/(mN/m) 48.4 78.2 consistency k 14.741 - power law n 0.517 5 - 
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