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Deformation of the Vertical Velocity Profile during Deceleration of a Flow with an Adverse Pressure Gradient

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Moscow University Physics Bulletin Aims and scope

Abstract

It has been shown experimentally that an adverse pressure gradient leads to periodic deceleration of the boundary layer of a plane-parallel flow in an open channel. During the deceleration, the action of the reverse pressure gradient and friction force forms an instantaneous vertical velocity profile with a local minimum above the viscous layer between two inflection points. In a thin layer containing the upper inflection point, the plane-parallel flow is unstable, which has been confirmed experimentally: a cylindrical vortex is formed in this layer at a critical value of the reverse pressure gradient when the deceleration cycle terminates.

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Authors and Affiliations

  1. Department of Physics, Moscow State University, 119992, Moscow, Russia

    O. N. Melnikova & H. Yang

Authors
  1. O. N. Melnikova
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  2. H. Yang
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Correspondence to O. N. Melnikova.

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Translated by V. Arutyunyan

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Melnikova, O.N., Yang, H. Deformation of the Vertical Velocity Profile during Deceleration of a Flow with an Adverse Pressure Gradient. Moscow Univ. Phys. 76, 110–115 (2021). https://doi.org/10.3103/S0027134921020077

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  • DOI: https://doi.org/10.3103/S0027134921020077

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