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首页> 外文期刊>Journal of Applied Mechanics and Technical Physics >The role of external influences in the formation of waves on the surface of a flowing-down film of a viscous fluid
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The role of external influences in the formation of waves on the surface of a flowing-down film of a viscous fluid

机译：外部影响在粘性流体下流膜表面形成波的作用

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摘要

The example of two non-stationary forces is used to study the impact of external influences leading to the occurrence of additional ponderomotive forces on the wave regimes of the film freely flowing down a vertical surface. The first case describes a ferromagnetic fluid film affected by the magnetic field, and the second case touches upon a dielectric fluid film affected by the electric field. For the given forces, in the case of small flow rates, the problem is reduced to the solution of a model equation for the perturbation of the film thickness. The numerical solutions of the problem are obtained, and several characteristic scenarios of evolution of periodical perturbations are considered. It is shown that changes in the boundaries of the region of linear stability of the unperturbed flow with a flat free surface under the influence of ponderomotive forces have a great impact on the flow.
机译：以两个非平稳力为例来研究外部影响的影响，该影响导致在垂直向下流动的薄膜的波动状态下产生额外的质动力。第一种情况描述受磁场影响的铁磁流体膜，第二种情况触及受电场影响的介电流体膜。对于给定的力，在小流量的情况下，问题被简化为用于膜厚度扰动的模型方程的解。得到了该问题的数值解，并考虑了周期性扰动演化的几种典型情况。结果表明，在动动力的作用下，具有平坦自由表面的无扰动流的线性稳定性区域边界的变化对流有很大影响。

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