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Aerodynamically driven rupture of a liquid film by turbulent shear flow

Melissa Kozul1,*, Pedro S. Costa2,3, James R. Dawson1, and Luca Brandt1,3

  • 1Department of Energy and Process Eng., NTNU, N-7491 Trondheim, Norway
  • 2Faculty of Industrial Eng., Mechanical Eng. and Computer Science, 107 University of Iceland, Reykjavík, Iceland
  • 3Linné FLOW Centre and SeRC (Swedish e-Science Research Centre), KTH Mechanics, SE-100 44 Stockholm, Sweden

  • *melissa.kozul@ntnu.no
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Phys. Rev. Fluids 5, 124302 – Published 16 December, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.124302

Abstract

The rupture of a liquid film due to coflowing turbulent shear flows in the gas phase is studied using a volume-of-fluid method. To simulate this multiphase problem, we use a simplified numerical setup where the liquid film is “sandwiched” between two fully developed boundary layers from a turbulent channel simulation. The film deforms and eventually ruptures within the shear zone created by the coflows. This efficient setup allows systematic variation of physical parameters to gauge their role in the aerodynamically driven deformation and rupture of a liquid film under fully developed sheared turbulence. This work presents a detailed study of the developing pressure field over the deforming film and related aerodynamic effects, as previously suggested by other authors, in particular the role of the inviscid lift and drag forces. A cumulative lift force is introduced to capture the effect of the alternating pressure minima and maxima forming over the film, which amplify and eventually rupture the film. A velocity scale derived from the lift-induced drag force reflects the state of the turbulent boundary layer over the film and collapses the temporal development of this cumulative lift force as well as the amplitude of film deformation with some success for the different film thicknesses and Reynolds numbers.

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Outline

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Phys. Rev. Fluids 5, 124302– Published 16 December, 2020
  • Received 5 August 2020
  • Accepted 9 November 2020
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