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| Numerical analysis of rebound process of ellipsoidal droplets impact on superhydrophobic surface |
| Received:June 02, 2020 Revised:August 11, 2020 |
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| DOI：10.7511/jslx20200602001 |
| KeyWord:ellipsoidal droplets super-hydrophobic surface computational fluid dynamics CFD secondary droplet |
| Author | Institution |
| 涂德浴 |
安徽工业大学 机械工程学院, 马鞍山 |
| 潘庆民 |
安徽工业大学 机械工程学院, 马鞍山 |
| 童宝宏 |
安徽工业大学 机械工程学院, 马鞍山 |
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| Abstract: |
| Droplets often change into an ellipsoid shape when they are in free fall or under the action of an external force,which has a great influence on the motion form of impacting the super-hydrophobic wall and the formation of secondary droplets.This paper assumes that ellipsoidal droplets with different geometric aspect ratios (ARs) appear.The rebound process of an ellipsoidal droplet after impacting on the super-hydrophobic wall is studied by using the coupled Level Set-VOF method for gas-liquid interface tracking and the effect of AR on the formation of secondary droplets is also analyzed.The research shows that the rebound process of ellipsoidal droplets with different AR has certain similarities while there are obvious differences in some details.The droplets will stretch to form a long liquid column during the rebound process,the diameter of the undisturbed interface decreases with the increase of ARs.Under the influence of Plateau-Rayleigh instability,the long liquid column will break up to form secondary droplets,but the low ARs can significantly inhibit the formation of secondary droplets.When the AR is less than the critical value of 0.6,the internal pressure of the droplets is uniform and stable,and no secondary droplets are eventually generated during the rebound process. |