Fig. 1. Experimental set up of the droplet impacting on spherical surface.液滴撞击球面实验装置系统

Fig. 2. Measurement of droplet diameter and its velocity: (a) Before impacting; (b) impacting plane; (c) impacting spherical surface; (d) velocity analysis.液滴速度和直径测量　(a)撞击前; (b) 撞击平面; (c) 撞击球面; (d) 速度分析

Fig. 3. Velocity of the falling droplet (δ = 0.05 mm^–1, We = 632.76). 液滴下落的速度 (δ = 0.05 mm^–1, We = 632.76)

Fig. 4. Impacting velocity of falling droplets at different heights.不同高度下降落液滴撞击时速度

Fig. 5. Dynamic behavior of drops impacting on spherical surface of two curvatures (We = 632.76, Re = 13906.83): (a) δ = 0.05 mm^–1; (b) δ = 0.25 mm^–1. 水滴撞击两种曲率球面的动态行为(We = 632.76, Re = 13906.83)　(a) δ = 0.05 mm^–1; (b) δ = 0.25 mm^–1

Fig. 6. Dynamic spreading factor of droplet impacting on different curvatures 不同撞击曲率下的动态铺展因子实时分布

Fig. 7. Local enlarged image of the Dynamic spreading factor.动态铺展因子局部放大

Fig. 8. Influence of spherical curvature on the maximum spreading factor.球面曲率对最大铺展因子的影响

Fig. 9. Dynamic behavior of droplet impacting on spherical surface for different We (δ = 0.125 mm^–1): (a) We = 171.40; (b) We = 532.87; (c) We = 838.00. 不同韦伯数下液滴撞击球面行为的动态过程 (δ = 0.125 mm^–1)　(a) We = 171.40; (b) We = 532.87; (c) We = 838.00

Fig. 10. (a) Dynamic spreading factor of droplet impacting for different We; (b) comparison with the results of Zhu et al^[34](a)不同韦伯数下的动态铺展因子的实时变化; (b) 实验与Zhu等^[34]相似结果对比

Fig. 11. Influence of We on maximum spreading factor for different curvatures. 不同曲率下韦伯数对最大铺展因子的影响