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Numerical simulation of dissolved air flotation using a lattice Boltzmann method.

Amirabbas Ghorbanpour-Arani1, Mohammad-Hassan Rahimian1, Reza Haghani-Hassan-Abadi1

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This study uses a lattice Boltzmann model to simulate bubble and droplet behavior in dissolved air flotation systems. The model accurately captures fluid dynamics under various conditions, aiding in system optimization.

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Area of Science:

  • Fluid Dynamics
  • Computational Physics
  • Chemical Engineering

Background:

  • Dissolved air flotation (DAF) systems are crucial for water treatment.
  • Understanding bubble and droplet dynamics is key to optimizing DAF efficiency.
  • Existing models may struggle with high density/viscosity ratios and complex flow conditions.

Purpose of the Study:

  • To investigate bubble and droplet behavior in a dissolved air flotation system.
  • To implement and validate a lattice Boltzmann model for ternary flows.
  • To analyze the impact of various parameters on fluid dynamics within the DAF system.

Main Methods:

  • Implementation of a lattice Boltzmann model based on Cahn-Hilliard equations for ternary flows.
  • Validation using classical problems: liquid lens spreading and Rayleigh-Taylor instability.
  • Simulation of three-component flow in a tank under varying density, viscosity, and diameter ratios.

Main Results:

  • The lattice Boltzmann model successfully handles high density and viscosity ratios.
  • The model accurately captures both partial and total spreading conditions.
  • Dimensionless average velocity and locations of bubbles/droplets were analyzed across different parameter ratios.

Conclusions:

  • The validated lattice Boltzmann model is capable of simulating complex three-component flows.
  • Numerical results align with physical expectations, confirming model accuracy.
  • This simulation approach provides valuable insights for dissolved air flotation system design and operation.