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A Numerical Study of Heterogeneous Nucleation and Mist Formation in Turbulent Flows between Parallel Plates

机译：平行板间湍流非均相成核和薄雾形成的数值研究

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摘要

In order to predict fog in an air-induced tunnel, heterogeneous nucleation and water-mist development in turbulent duct flows with cold bottom/top surfaces are numerically investigated. The distribution function of a fine aerosol, considered as seeds of water mist, and the Stokes force on larger particles are taken into consideration for the particle diffusivity, the k-ε turbulent model, and gravity precipitation. For a two-dimensional duct of 2 m x 360 m with an air-flow rate of 1.0 m/s, mist formation occurs mainly near the upper wall and water mist develops up to 10 μm in radius. In the mist-saturated regions of the tunnel, the deposition flux at the bottom surface is much larger than the vapor flux because of the contribution from precipitation. The effects of the distribution function of seeds and the Reynolds number are also discussed in detail.
机译：为了预测空气诱发的隧道中的雾气，对底部/顶部表面较冷的湍流管道中的异质形核和水雾发展进行了数值研究。考虑到粒子的扩散率，k-ε湍流模型和重力沉降，考虑了作为水雾种子的细小气溶胶的分布函数以及作用在较大粒子上的斯托克斯力。对于2 m x 360 m的二维管道，空气流速为1.0 m / s，雾的形成主要发生在上壁附近，而水雾的半径最大可达10μm。在隧道的雾气饱和区域，由于降水的贡献，底表面的沉积通量比蒸汽通量大得多。还详细讨论了种子分布函数和雷诺数的影响。

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