Experimental study on influence of liquid depth on morphological characteristics after droplet impact

XU Duoguang; XU Wan; YUAN Dekui

doi:10.11729/syltlx20210153

Volume 37 Issue 2

Apr. 2023

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Article Navigation > Journal of Experiments in Fluid Mechanics > 2023 > 37(2): 46-55

XU D G, XU W, YUAN D K. Experimental study on influence of liquid depth on morphological characteristics after droplet impact[J]. Journal of Experiments in Fluid Mechanics, 2023, 37(2): 46-55 doi: 10.11729/syltlx20210153

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Experimental study on influence of liquid depth on morphological characteristics after droplet impact

doi: 10.11729/syltlx20210153

School of Mechanical Engineering, Tianjin University, Tianjin　300354, China

Received Date: 2021-09-30
Accepted Date: 2022-01-21
Rev Recd Date: 2022-01-19
Publish Date: 2023-04-25

Abstract

Abstract

Characteristics and mechanism of a droplet impacting on the liquid surface were studied experimentally. The process of droplet impinging on the liquid surface with different depths of the liquid pool was recorded with a high-speed camera, and the characteristic phenomena such as liquid crater, liquid crown, central jet and secondary droplet that appeared at different stages were summarized. An image processing program was developed and the automatic extraction of geometric parameters was then realized. The influence of pool depth Weber number, droplet diameter, and falling height on droplet impacts was discussed. The results show that: under the condition of constant Weber number, when the pool depth crosses a certain critical value, the characteristic phenomena such as liquid crater, liquid crown, central jet and secondary droplet change significantly; the ratio of the liquid crown height to the liquid crater depth increases within a certain range with the increase of Weber number; whether the secondary droplet can be separated by the central jet is closely related to the depth of the liquid pool and the diameter of the initial droplet.
- droplet impact,
- liquid depth,
- liquid crater,
- central jet,
- Weber number,
- computer vision algorisms

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References(26)

References

[1]	WORTHINGTON A M. On the forms assumed by drops of liquids falling vertically on a horizontal plate[J]. Proceedings of the Royal Society of London, 1877, 25(171-178): 261–272. doi: 10.1098/rspl.1876.0048
[2]	WORTHINGTON A M, COLE R S. Impact with a liquid surface, studied by the aid of instantaneous photography[J]. Philosophical Transactions of the Royal Society of London Series A, Containing Papers of a Mathematical or Physical Character, 1897, 189: 137–148. doi: 10.1098/rsta.1897.0005
[3]	SAHA A, WEI Y J, TANG X Y, et al. Kinematics of vortex ring generated by a drop upon impacting a liquid pool[J]. Journal of Fluid Mechanics, 2019, 875: 842–853. doi: 10.1017/jfm.2019.503
[4]	OKAWA T, SHIRAISHI T, MORI T. Production of secondary drops during the single water drop impact onto a plane water surface[J]. Experiments in Fluids, 2006, 41(6): 965–974. doi: 10.1007/s00348-006-0214-x
[5]	ROISMAN I V, VAN HINSBERG N P, TROPEA C. Propagation of a kinematic instability in a liquid layer: capillary and gravity effects[J]. Physical Review E: Statisti-cal, Nonlinear & Soft Matter Physics, 2008, 77(4): 046305. doi: 10.1103/PhysRevE.77.046305
[6]	VAN HINSBERG N P, BUDAKLI M, GÖHLER S, et al. Dynamics of the cavity and the surface film for impingements of single drops on liquid films of various thicknesses[J]. Journal of Colloid and Interface Science, 2010, 350(1): 336–343. doi: 10.1016/j.jcis.2010.06.015
[7]	MANZELLO S L, YANG J C. An experimental study of a water droplet impinging on a liquid surface[J]. Experiments in Fluids, 2002, 32(5): 580–589. doi: 10.1007/s00348-001-0401-8
[8]	CASTILLO-OROZCO E, DAVANLOU A, CHOUDHURY P K, et al. Droplet impact on deep liquid pools: Rayleigh jet to formation of secondary droplets[J]. Physical Review E: Statistical, Nonlinear & Soft Matter Physics, 2015, 92(5): 053022. doi: 10.1103/PhysRevE.92.053022
[9]	马慧敏, 刘长根, 李旭, 等. 液滴冲击液面过程中变形特征的实验研究[J]. 实验力学, 2019, 34(4): 600–608. doi: 10.7520/1001-4888-18-016 MA H M, LIU C G, LI X, et al. Experimental study of deformation characteristics during the process of liquid drop impact liquid surface[J]. Journal of Experimental Mechanics, 2019, 34(4): 600–608. doi: 10.7520/1001-4888-18-016
[10]	郭通, 袁德奎, 赵丰泽. 液滴撞击液面形成的液坑形态特征及其重力势能分析[J]. 实验流体力学, 2021, 35(6): 17–27. doi: 10.11729/syltlx20200128 GUO T, YUAN D K, ZHAO F Z. Study of morphological characteristics and gravitational potential energy of crater formed by droplet impact[J]. Journal of Experiments in Fluid Mechanics, 2021, 35(6): 17–27. doi: 10.11729/syltlx20200128
[11]	徐明俊. 单液滴与着火液体相互作用动力学特性研究[D]. 合肥: 中国科学技术大学, 2018. XU M J. Study of drop impact dynamics on burning liquid[D]. Hefei: University of Science and Technology of China, 2018.
[12]	ENGEL O G. Crater depth in fluid impacts[J]. Journal of Applied Physics, 1966, 37(4): 1798–1808. doi: 10.1063/1.1708605
[13]	FEDORCHENKO A I, WANG A B. On some common features of drop impact on liquid surfaces[J]. Physics of Fluids, 2004, 16(5): 1349–1365. doi: 10.1063/1.1652061
[14]	XU M J, LI C H, WU C P, et al. Regimes during single water droplet impacting on hot ethanol surface[J]. International Journal of Heat and Mass Transfer, 2018, 116: 817–824. doi: 10.1016/j.ijheatmasstransfer.2017.09.030
[15]	MACKLIN W C, HOBBS P V. Subsurface phenomena and the splashing of drops on shallow liquids[J]. Science, 1969, 166(3901): 107–108. doi: 10.1126/science.166.3901.107
[16]	MACKLIN W C, METAXAS G J. Splashing of drops on liquid layers[J]. Journal of Applied Physics, 1976, 47(9): 3963–3970. doi: 10.1063/1.323218
[17]	PUMPHREY H C, ELMORE P A. The entrainment of bubbles by drop impacts[J]. Journal of Fluid Mechanics, 1990, 220: 539–567. doi: 10.1017/s0022112090003378
[18]	LENG L J. Splash formation by spherical drops[J]. Journal of Fluid Mechanics, 2001, 427: 73–105. doi: 10.1017/s0022112000002500
[19]	OGUZ H N, PROSPERETTI A. Bubble entrainment by the impact of drops on liquid surfaces[J]. Journal of Fluid Mechanics, 1990, 219: 143. doi: 10.1017/s0022112090002890
[20]	NIKOLOPOULOS N, THEODORAKAKOS A, BERGELES G. Three-dimensional numerical investigation of a droplet impinging normally onto a wall film[J]. Journal of Computational Physics, 2007, 225(1): 322–341. doi: 10.1016/j.jcp.2006.12.002
[21]	NIKOLOPOULOS N, THEODORAKAKOS A, BERGELES G. Normal impingement of a droplet onto a wall film: a numerical investigation[J]. International Journal of Heat and Fluid Flow, 2005, 26(1): 119–132. doi: 10.1016/j.ijheatfluidflow.2004.06.002
[22]	马慧敏, 刘长根, 董娇娇. 液滴冲击液面变形特征及其能量转化研究[J]. 水动力学研究与进展(A辑), 2019, 34(3): 283–290. doi: 10.16076/j.cnki.cjhd.2019.03.002 MA H M, LIU C G, DONG J J. Study of deformation characteristics and energy conversion during the process of droplet impacting on liquid surface[J]. Chinese Journal of Hydrodynamics, 2019, 34(3): 283–290. doi: 10.16076/j.cnki.cjhd.2019.03.002
[23]	VANDER WAL R L, BERGER G M, MOZES S D. Droplets splashing upon films of the same fluid of various depths[J]. Experiments in Fluids, 2006, 40(1): 33–52. doi: 10.1007/s00348-005-0044-2
[24]	COLE D E. The splashing morphology of liquid-liquid impacts[D]. Queensland: James Cook University, 2007.
[25]	COSSALI G E, MARENGO M, COGHE A, et al. The role of time in single drop splash on thin film[J]. Experiments in Fluids, 2004, 36(6): 888–900. doi: 10.1007/s00348-003-0772-0
[26]	HALLETT J, CHRISTENSEN L. Splash and penetration of drops in water[J]. Journal de Recherches Atmospheriques, 1984, 18(4): 225–242.