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| Simulation of droplet directional migration and coalescence on gradient wetting surfaces by lattice Boltzmann method |
| Received:June 13, 2018 Revised:August 09, 2018 |
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| DOI：10.7511/jslx20180613003 |
| KeyWord:lattice Boltzmann method wetting gradient droplet size wetting length coalescence |
| Author | Institution |
| 王鑫 |
东南大学 能源与环境学院, 南京 |
| 陈振乾 |
东南大学 能源与环境学院, 南京 |
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| Abstract: |
| Directional migration and coalescence of droplets on gradient wetting surfaces were simulated by improved lattice Boltzmann method.The accuracy and stability of this model can be greatly improved.And evolutional characteristics of droplet directional migration and coalescence on gradient wetting surfaces were studied.Besides,the effect of droplet size and wetting gradient on the dynamic behavior was analyzed.The numerical results indicated that droplet deformation can be seen and dynamic contact angle decreases when moving on gradient wetting surfaces.Wetting gradient has a great effect on the droplet directional motion.Displacement of the left and right contact line and wetting length increase with the increase in wetting gradient.However,droplet size has little influence on displacement of contact line.The wetting gradient has no effect on the width of the liquid bridge,but it has a significant impact on the initial coalescence time of the droplets. |