| 刘冬薇,宁智,吕明,阎凯,孙春华.液滴撞击超疏水壁面反弹及破碎行为研究[J].计算力学学报,2016,33(1):106~112 |
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| 液滴撞击超疏水壁面反弹及破碎行为研究 |
| Study on the rebound and breakup of the droplet after impacting on the super-hydrophobic wall |
| 投稿时间：2014-10-10 修订日期：2014-12-25 |
| DOI：10.7511/jslx201601017 |
| 中文关键词: 液滴撞击 超疏水壁面 反弹 破碎 数值模拟 |
| 英文关键词:droplet impact super-hydrophobic wall rebound breakup numerical simulation |
| 基金项目:国家自然科学基金(51276011);国家高技术研究发展计划(2011AA11A103-4-1);北京市自然科学基金(3132016)[BP(];内燃机燃烧学国家重点实验室开放基金(k2013-3)[BP)]资助项目. |
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| 中文摘要: |
| 液滴撞击壁面时,壁面亲水性对液滴撞击壁面后的变化历程具有重要的影响。利用相界面追踪的复合Level Set-VOF方法对液滴撞击超疏水壁面的运动进行了研究。研究结果表明,撞击速度较小时,液滴撞壁后发生反弹;撞击速度较大时,液滴撞壁后会发生破碎现象;初始粒径的增大和表面张力的减小,有利于液滴撞壁后产生铺展破碎现象;撞击角度对撞壁后的液滴行为具有较大的影响。通过数值模拟,给出了一定条件下液滴垂直及倾斜撞击超疏水壁面反弹及破碎的临界条件。 |
| 英文摘要: |
| The surface hydro-philicity has an important effect on the variation process of the droplet intensively when the droplet impacts on the wall.In this paper, the motion of the droplet after impacting on the super-hydrophobic wall are studied by using the coupled Level Set-VOF method for gas-liquid interface tracking.The results show that the droplet with low velocity will rebound after impacting on the super-hydrophobic wall, while the droplet with high velocity will breakup after impacting on the super-hydrophobic wall.As the initial droplet diameter increases and the surface tension decreases, the spreading-breakup phenomenon occurs more easily when the droplet impacts on the super-hydrophobic wall.Also, the impact angle has a great effect on the movement of the droplet impacting on the super-hydrophobic wall.In addition, the critical conditions of rebound and breakup are summarized respectively by numerical simulation when the droplet impacts on the super-hydrophbic wall by vertical and inclined angle. |
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