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滴滴在惯性阶段冲击亚毫米微观结构表面时的湿化行为
Patrick Palmetshofer1, Jonathan Wurst1, Anne K Geppert1
1Institute of Aerospace Thermodynamics, University of Stuttgart, Pfaffenwaldring 31, Stuttgart, 70569, Germany.
Journal of colloid and interface science
|December 4, 2024
概括
滴滴对结构表面的冲击会产生钻石形的扩散模式,受结构大小和冲击速度的影响. 流量可以在槽交叉点划分,改变最终的湿区域形状.
科学领域:
- 流体动力学 流体动力学
- 表面科学是一门科学.
- 微流体学 微流体学
背景情况:
- 滴滴撞击动态在各种应用中至关重要.
- 表面地形显著影响滴滴传播行为.
- 了解结构表面内的流动模式是控制湿的关键.
研究的目的:
- 为了研究早期阶段的滴滴在立方柱阵列上传播.
- 为了确定结构大小,冲击速度和流体特性对湿模式的影响.
- 分析槽口交叉点的流动行为.
主要方法:
- 在不同尺寸的立方柱阵列上进行实验性滴滴影响研究.
- 使用控制的韦伯和雷诺兹数的水和异醇滴.
- 使用内部FS3D代码验证实验结果的数值模拟.
- 修改表面的湿透性 (接触角度) 从超性到疏水性.
主要成果:
- 观察到钻石形的扩散图案,边缘与结构相比45°.
- 根据结构大小和冲击速度,确定了从圆形扩散到钻石扩散的过渡.
- 演示了沟交叉口作为流分隔器,在扩散时创建90°的曲.
- 表明高冲击速度可以导致流体喷流穿过结构.
结论:
- 表面结构和撞击条件决定了滴滴传播形态.
- 槽交叉提供了一种机制来控制结构表面上的流体路径.
- 该研究提供了对复杂的微型架构表面滴滴操纵的见解.
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