Wetting effects on the spreading of a liquid droplet colliding with a flat surface: Experiment and modeling

Physics of Fluids - Tập 7 Số 2 - Trang 236-247 - 1995
Jun Fukai1,2, Y. Shiiba1, T. Yamamoto1, Osamu Miyatake1, Dimos Poulikakos3, Constantine M. Megaridis3, Zhiguo Zhao3
1Department of Chemical Engineering Kyushu University Fukuoka 812 Japan
2Product system engineering
3Department of Mechanical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607

Tóm tắt

In this paper an experimental and theoretical study of the deformation of a spherical liquid droplet colliding with a flat surface is presented. The theoretical model accounts for the presence of inertia, viscous, gravitation, surface tension, and wetting effects, including the phenomenon of contact-angle hysteresis. Experiments with impingement surfaces of different wettability were performed. The study showed that the maximum splat radius decreased as the value of the advancing contact angle increased. The effect of impact velocity on droplet spreading was more pronounced when the wetting was limited. The experimental results were compared to the numerical predictions in terms of droplet deformation, splat radius, and splat height. The theoretical model predicted well the deformation of the impacting droplet, not only in the spreading phase, but also during recoiling and oscillation. The wettability of the substrate upon which the droplet impinges was found to affect significantly all phases of the spreading process, including the formation and development of a ring structure around the splat.

Từ khóa


Tài liệu tham khảo

1967, The splash of a liquid droplet, J. Appl. Phys., 38, 3855, 10.1063/1.1709031

1990, Numerical analysis of the deformation process of a droplet impinging upon a wall, JSME Int. J. Ser. II, 33, 555

1991, Mathematical modeling of the isothermal impingement of liquid droplets in spray processes, Metall. Trans. B, 22, 901, 10.1007/BF02651166

1965, Numerical calculation of time-dependent viscous incompressible flow of fluid with free surface, Phys. Fluids, 8, 2182, 10.1063/1.1761178

1981, Volume of fluid (VOF) method for the dynamics of free boundaries, J. Comput. Phys., 39, 201, 10.1016/0021-9991(81)90145-5

1992, A continuum method for modeling surface tension, J. Comput. Phys., 100, 335, 10.1016/0021-9991(92)90240-Y

1991, On the collision of a droplet with a solid surface, Proc. R. Soc. London Ser. A, 432, 13, 10.1098/rspa.1991.0002

1992, Deformation and solidification of a droplet on a cold substrate, Chem. Eng. Sci., 47, 3059, 10.1016/0009-2509(92)87006-C

1993, Numerical simulation of substrate impact and freezing of droplets in plasma spray processes, J. Phys. D Appl. Phys., 26, 1900, 10.1088/0022-3727/26/11/010

1976, Solidification of droplets on a cold surface, Int. J. Heat Mass Transfer, 19, 1009, 10.1016/0017-9310(76)90183-6

1993, Numerical analysis of the deformation and solidification of a single droplet impinging onto a flat substrate, J. Mat. Sci., 28, 3313, 10.1007/BF00354253

1993, Splat-quench solidification: Estimating the maximum spreading of a droplet impacting a solid surface, J. Mat. Sci., 28, 963, 10.1007/BF00400880

1994, Heat transfer aspects of splat-quench solidification: modelling and experiment, J. Mat. Sci., 29, 2025, 10.1007/BF01154677

1994, Solidification of liquid metal droplets impacting sequentially on a solid surface, J. Heat Transfer, 116, 436, 10.1115/1.2911416

1990, Splat-quench solidification of freely falling liquid-metal drops by impact on a planar substrate, J. Mat. Sci., 5, 3677

1966, The heat transfer from a hot wall to impinging water drops in the spheroidal state, Chem. Eng. Sci., 21, 1047, 10.1016/0009-2509(66)85100-X

1993, Modeling of the deformation of a liquid droplet impinging upon a flat surface, Phys. Fluids A, 5, 2588, 10.1063/1.858724

1979, On the spreading of liquids on solid surfaces: Static and dynamic contact lines, Annu. Rev. Fluid Mech., 11, 371, 10.1146/annurev.fl.11.010179.002103

1985, Wetting: Statics and dynamics, Rev. Mod. Phys., 57, 827, 10.1103/RevModPhys.57.827

1992, Liquid spreading, Rep. Prog. Phys., 25, 431

1989, Molecular dynamics of fluid flow at solid surfaces, Phys. Fluids A, 1, 784

1989, Simulations of contact line motion: Slip and the dynamic contact angle, Phys. Rev. Lett., 63, 766, 10.1103/PhysRevLett.63.766

1989, Molecular layering in the spreading of wetting liquid drops, Nature, 338, 640, 10.1038/338640a0

1993, The spreading of layered microdroplets, J. Colloid. Int. Sci., 158, 27, 10.1006/jcis.1993.1224

1985, On the ability of drops or bubbles to stick to nonhorizontal surfaces of solids. Part 2. Small drops or bubbles having contact angles of arbitrary size, J. Fluid Mech., 151, 1, 10.1017/S0022112085000842

1983, A finite element method for high Reynolds number viscous fluid flow using two step explicit scheme, Int. J. Num. Methods Fluids, 3, 137, 10.1002/fld.1650030205

1985, An algorithm for the use of the Lagrangian specification in Newtonian fluid mechanics and applications to freesurface flow, J. Fluid Mech., 152, 173, 10.1017/S0022112085000635

Thông tin
Thông tin xuất bản

Physics of Fluids

Tập 7 Số 2

236-247

Thông tin tác giả