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| 振动作用下梯度浸润表面复合液滴的动态行为 |
| Dynamic behavior of compound droplets on gradient wettability surfaces under vibration |
| 投稿时间：2024-12-30 |
| DOI：10.13259/j.cnki.eri.2025.04.005 |
| 中文关键词: 复合液滴 梯度浸润表面 铺展 气泡 振动 |
| 英文关键词:compound droplet gradient wettability surface spreading bubble vibration |
| 基金项目:国家自然科学基金资助项目（51776128） |
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| 摘要点击次数: 696 |
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| 中文摘要: |
| 复合液滴的动态行为对3D打印、微流体控制技术以及涂覆技术等许多应用领域提高产品或设备性能具有重要意义。以聚二甲基硅氧烷（PDMS）为基底，利用光刻技术制备了微方柱状梯度浸润表面，研究了振动作用下梯度浸润表面含气泡的复合液滴的动态行为。结果表明：当气泡位于液滴前端时，液滴的前端接触角增大，有利于液滴铺展；气泡位于液滴后端时，液滴的后端接触角增大，抑制了液滴的铺展。对液滴施加不同参数的振动后发现，共振频率下液滴的形变最剧烈，最大铺展因子最大。随着振动频率远离共振频率，液滴的最大铺展因子减小。最后发现气泡尺寸对液滴形变有抑制作用：对于一定尺寸的液滴，随着其内部气泡尺寸的增大，液滴的形变能力减弱，最大铺展因子减小；而当气泡尺寸不变时，随着液滴体积的增大，最大铺展因子呈先增加后减小的趋势。 |
| 英文摘要: |
| The dynamic behavior of compound droplets plays a significant role in improving the performance of products and devices in fields such as 3D printing, microfluidic control technologies, and coating techniques. In this work, micro-pillar gradient wettability surfaces were fabricated on polydimethylsiloxane (PDMS) substrate by using photolithography. The dynamic behavior of compound droplets containing air bubbles on the gradient wettability surface under vibration was investigated. The results reveal that when the air bubble is located at the front of the droplet, the front contact angle of the droplet increases, which favors the spreading of the droplet. Conversely, when the bubble is at the rear of the droplet, it increases the rear contact angle, which inhibits the spreading of the droplet. Additionally, when the droplet is subjected to vibrations with different frequency and amplitude, the greatest deformation and the largest maximum spreading factor are obtained at the resonance frequency. As the vibration frequency deviates from the resonance frequency, the maximum spreading factor gradually decreases. Finally, it is found that bubble size has a suppressive effect on droplet deformation. For a given size of droplet, as the bubble size increases, the deformation extent of the droplet weakens, and the maximum spreading factor decreases. Moreover, when the bubble size remains constant, with the increase of the droplet size, the maximum spreading factor first increases and then decreases. |
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