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关于带有合湿度差异和凸条纹阵列的表面性能研究,以改善空气层稳定性
Shuai Qiao1, Chujiang Cai1,2, Chong Pan1,2
1Key Laboratory of Fluid Mechanics of Ministry of Education, Beihang University, Beijing 100191, China.
Langmuir : the ACS journal of surfaces and colloids
|February 20, 2024
概括
在超疏水表面上提高空气层的稳定性是减少摩擦阻力的关键. 一种新的表面设计,结合了湿度差异和凸条纹,显著提高了空气层的稳定性,提高了阻力降低效率.
科学领域:
- 流体动力学 流体动力学
- 表面科学是一门学科.
- 材料工程 材料工程 材料工程
背景情况:
- 超疏水表面的摩擦阻力由一个被困的空气层减少.
- 保持空气层的稳定性对于节能和减少污染至关重要.
- 凯尔文-赫尔姆霍尔茨不稳定,由密度和速度差异驱动,使空气层不稳定.
研究的目的:
- 开发和实验评估一种新的超水表面,以提高空气层的稳定性.
- 为了研究在旋转流场中空气层不稳定的机制.
- 为了量化开发的表面的阻力降低性能.
主要方法:
- 使用激光雕刻和修饰制造超水表面.
- 整合凸条纹阵列和湿度差异处理.
- 在·卡曼旋转流场中进行实验研究,以分析空气层稳定性和临界雷诺兹数 (Re_c).
主要成果:
- 一个均的超疏水表面的临界雷诺德数 (Re_c) 是1.62 × 10^5.5.
- 一个带有凸条纹的表面 (SCSS_P) 将Re_c增加到3.24 × 10^5.
- 通过凸条纹阵列设计的合湿度差异处理,增加了Re_c至4.05 × 10^5,保持了~30%的阻力降低.
结论:
- 湿度差异和凸条纹阵列的联合策略显著提高了空气层的稳定性.
- 这种改善的稳定性导致更高的临界雷诺兹数和持续的阻力减小.
- 开发的表面提供了一种有前途的方法来减少能量消耗和摩擦阻力对环境的影响.
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