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Bubble rising and interaction in ternary fluid flow: a phase field study.

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Area of Science:

  • Fluid dynamics
  • Computational physics

Background:

  • Bubble-droplet interactions are crucial for gas-flotation wastewater treatment.
  • Experimental methods have limitations in fully understanding fluid flow dynamics.

Purpose of the Study:

  • To develop and validate a phase field model for three-phase flow.
  • To investigate single bubble rise and bubble-droplet interactions.

Main Methods:

  • Utilized a phase field model coupled with Navier-Stokes equations.
  • Employed Cahn-Hilliard equation for interface tracking.
  • Discretized using explicit finite difference method and projection method for pressure-velocity coupling.
  • Developed in-house Fortran code with OpenMP for parallel processing.

Main Results:

  • Model validated against experimental data with high accuracy.
  • Simulated two scenarios: bubble crossing an interface and bubble chasing a droplet.
  • Provided insights into fluid flow during bubble-droplet interactions.

Conclusions:

  • The developed phase field model accurately captures bubble-droplet interactions.
  • The model serves as a valuable tool for understanding gas-flotation processes in wastewater treatment.
  • Further research can explore more complex scenarios and fluid properties.