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Direct numerical simulations of multifluid flows in a vertical channel undergoing topology changes

Jiacai Lu* and Gretar Tryggvason

  • Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland, USA

  • *Corresponding author: jiacai.lu@jhu.edu
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Phys. Rev. Fluids 3, 084401 – Published 30 August, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.084401

Abstract

Multifluid flows in a vertical channel are examined by direct numerical simulations, for situations where the topology of the interface separating the different fluids changes. Several bubbles are initially placed in a turbulent channel flow at a sufficiently high void fraction so that the bubbles collide and the liquid film between them becomes very thin. This film is ruptured at a predetermined thickness and the bubbles are allowed to coalesce. For the cases with high surface tension the bubbles continue to coalesce, eventually forming one large bubble. At low surface tension, on the other hand, the large bubbles break up again, sometimes undergoing repeated coalescence and breakup. The evolution of various integral quantities, such as the average flow rate, wall shear, and interface area, are monitored and compared for different governing parameters. Averages of the flow field and the phase distribution over planes parallel to the walls are also examined, and the microstructure, at statistically steady state, is examined using low-order probability functions.

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Phys. Rev. Fluids 3, 084401– Published 30 August, 2018
  • Received 26 September 2017
Article part of CHORUS
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