Study on slip velocity characteristics of microscale concave flow over hydrophobic materials

ZHANG Zhaopeng; YE Zhengyin; YE Kun

doi:10.7638/kqdlxxb-2023.0176

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Study on slip velocity characteristics of microscale concave flow over hydrophobic materials

更新时间：2026-05-28

- Study on slip velocity characteristics of microscale concave flow over hydrophobic materials
- Vol. 42, Issue 6, Pages: 108-116(2024)
- 作者机构：
  
  西北工业大学航空学院,西安,710072
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2023.0176
  CLC： O356
- Published：2024
- 稿件说明：
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张昭朋, 叶正寅, 叶坤. 疏水材料微尺度凹坑流滑移速度特性研究[J]. 空气动力学学报, 2024, 42(6): 108−116.

ZHANG Zhaopeng, YE Zhengyin, YE Kun. Study on slip velocity characteristics of microscale concave flow over hydrophobic materials[J]. 2024, 42(6): 108-116.
张昭朋, 叶正寅, 叶坤. 疏水材料微尺度凹坑流滑移速度特性研究[J]. 空气动力学学报, 2024, 42(6): 108−116. DOI： 10.7638/kqdlxxb-2023.0176

ZHANG Zhaopeng, YE Zhengyin, YE Kun. Study on slip velocity characteristics of microscale concave flow over hydrophobic materials[J]. 2024, 42(6): 108-116. DOI： 10.7638/kqdlxxb-2023.0176.

摘要

凹坑构型是疏水材料中常见且重要的结构形式，认识和揭示此类凹坑结构的滑移速度特性对于疏水材料的设计具有指导意义。本文采用离散统一气体动理论，在

= 0.01～0.5范围内，对低速二维凹坑流动进行数值模拟，模拟结果表明，在不同

值下，滑移速度规律呈现显著差异：随着凹坑尺寸减小（

0.3），凹坑区的滑移速度小于平滑壁面的滑移速度；而随着凹坑尺寸增大（

0.2），凹坑区的滑移速度大于平滑壁面的滑移速度；在凹坑两端，统计平均滑移速度会出现跳跃，随着

数增加，这种跳跃现象越来越强。上述演化特征表明，在设计疏水微结构时，

不能大于0.3。

Abstract

The concave configuration represents a prevalent and pivotal structural form within hydrophobic materials. Comprehending the slip velocity characteristics associated with concave surfaces carries profound implications for the design of these materials. This investigation employs the Discrete Unified Gas-Kinetic Scheme (DUGKS) to simulate the low-speed

two-dimensional concave flow within the Knudsen number range spanning from 0.01 to 0.5. The numerical simulation results reveal a noteworthy variation in slip velocity patterns in relation to the Knudsen number. As the concave size decreases (

0.3)

the slip veloc

ity within the concave region is lower than that on a smooth wall. Conversely

as the concave size increases (

0.2)

the slip velocity exceeds that of a smooth wall. Additionally

there are discernible jumps in the statistically-averaged slip velocity at the cavity's boundaries

which become more pronounced with an increasing Knudsen number

suggesting that the Knudsen number should not exceed 0.3 when designing hydrophobic microstructures.

关键词

Keywords

references

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