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首页> 外文期刊>International Journal of Multiphase Flow >Instability of a two-layer capillary jet
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Instability of a two-layer capillary jet

机译:两层毛细管射流的不稳定性

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摘要

An axisymmetrical flow of a two-layer capillary jet is studied. The most general formulation of the jet instability problem is considered. The influence of the governing parameters on the amplification factor of the disturbances is investigated taking into account the variation along the jet of the main flow velocity profile. The boundary layer approximation to full Navier-Stokes formulation is applied for calculation of a stationary mean flow. Stability analysis is carried out for various cross sections along the jet on the assumption of a locally parallel main flow. Numerical calculations of the corresponding eigenvalue problem reveal two types of unstable perturbations connected with the presence of the free surface and interface accordingly. The predominant type of instability is defined by the main flow properties. Numerous solutions of the multiparameter stability problem are presented.
机译:研究了两层毛细管射流的轴对称流动。考虑了射流不稳定性问题的最一般的表述。考虑到主要流速曲线沿射流的变化,研究了控制参数对扰动放大因子的影响。完整的Navier-Stokes公式的边界层近似值用于计算固定平均流量。在假定局部平行主流的情况下,对沿射流的各种横截面进行了稳定性分析。相应特征值问题的数值计算揭示了两种类型的不稳定扰动,它们分别与自由表面和界面的存在有关。不稳定的主要类型由主要流动特性定义。提出了多参数稳定性问题的许多解决方案。

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