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Thin water films driven by air through surface roughness.

机译：空气通过表面粗糙度驱动的薄水膜。

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摘要

The interaction between thin films and roughness surfaces has been studied when the thin viscosity-dominated films are driven by the air shear stress in the context of a high Reynolds number boundary layer theory. A number of properties of this model are examined, such as transport and pooling of water in a roughness field, heat transfer of film/roughness combinations, and rivulet formation. For rivulet formation due to the instability of two-dimensional film fronts, a general formula for the largest unstable wavelength, the fastest temporal growth rate, and the neutral wavelength has been developed from the linear instability analysis. This formula is validated using experimental data for film fronts on flat surfaces which are driven by constant surface tension gradients. This formula is also validated using numerical simulations of film fronts moving through various roughened surfaces.; To describe a water bead on a precursor film, a new disjoining pressure model is developed from a modified classical long-distance disjoining pressure model. This model satisfies the requirement that the disjoining pressure on the precursor film is larger than zero. Another advantage of this modified model is that an effective distance used in classical long-distance disjoining pressure models is avoided even when a water bead is on a dry surface. This model is validated using experimental data from aircraft icing tests.
机译：在高雷诺数边界层理论的背景下，当由空气剪切应力驱动粘度薄的薄膜时，已经研究了薄膜与粗糙表面之间的相互作用。检查了该模型的许多属性，例如在粗糙度场中水的传输和合并，膜/粗糙度组合的热传递以及小溪的形成。对于由于二维膜前缘的不稳定性而形成的小溪，通过线性不稳定性分析已经开发出用于最大不稳定波长，最快时间增长率和中性波长的通用公式。使用由恒定表面张力梯度驱动的平坦表面上的胶片正面的实验数据验证了该公式。该公式还通过在各种粗糙表面上移动的胶片正面的数值模拟进行了验证。为了描述前体薄膜上的水珠，从改进的经典长距离分离压力模型开发了新的分离压力模型。该模型满足前体膜上的分离压力大于零的要求。此修改模型的另一个优点是，即使水珠在干燥的表面上，也可以避免在经典的长距离分离压力模型中使用的有效距离。使用飞机结冰测试的实验数据验证了该模型。

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  • 作者

    Wang, Guoqing.;

  • 作者单位

    Iowa State University.$bAerospace Engineering.;

  • 授予单位 Iowa State University.$bAerospace Engineering.;
  • 学科 Engineering Aerospace.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 158 p.
  • 总页数 158
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空、航天技术的研究与探索;
  • 关键词

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