Abstract
Three-dimensional (3D) visualization on droplet splashing characteristics is of great importance in the research of droplet impact on a solid surface. In this study, a high-speed digital in-line holography (DIH) system with \(1024 \times 1024\) pixels at 3500 Hz is employed to investigate the 3D splashing characteristics of large droplet impact (2630 ± 20 μm, which is called the mother droplet) on different rough surfaces and impacting velocities. The experiments are carried out in a wind tunnel at room temperature (15 \(^{\circ }\)C). The high-speed DIH system is calibrated to show that the depth position measurement error is less than 70 μm, and the the size measurement error is less than 2.06% for the target object larger than 31.1 μm. The droplet sizes, droplet number distribution, 3D position of the daughter droplets generated from droplet splash, as well as the morphology evolution are captured by time-resolved holographic visualization. The 3D motion trajectory of the daughter droplets is obtained by applying a four consecutive frames particle tracking algorithm based on particle matching probability, which can help to predict the secondary impact points of the daughter droplets. The results show that there exist three kinds of droplet breakup modes during the droplet impact and splashing process. It presents a more violent splashing behavior with the surface roughness and impacting velocity. The number of the daughter droplets at the 3rd frame after droplet collision increases with the surface roughness, which are 104, 49, 39, and 38 when the surface roughnesses are 250 μm, 25 μm, 3.2 μm and 2.6 μm, respectively. The daughter droplets are not in radially symmetric distribution for the reason of an asymmetry distribution of the flow field along the x-axis and y-axis in the test zone of the wind tunnel. High-speed DIH can be a tool to investigate the splashing characteristics to support the 3D splashing model improvement.
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Acknowledgements
The authors thank the financial support from National Natural Science Foundation of China (52006193), Natural Science Foundation of Zhejiang Province (LQ19E060010), National Science and Technology Major Project (2017-V-0016-0069), National Key Research and Development Program of China (2020YFA0405700, 2020YFB0606201), and Open Fund of Key Laboratory of Icing and Anti/De-icing (Grant No. IADL2019XXXX).
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Lin, X., Wang, Q., Wu, Y. et al. 3D visualization of droplet splash dynamics with high-speed digital holography. Exp Fluids 63, 86 (2022). https://doi.org/10.1007/s00348-022-03416-7
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DOI: https://doi.org/10.1007/s00348-022-03416-7