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Computational Modeling of Bubbles Growth Using the Coupled Level Set-Volume of Fluid Method.

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Summary

This study models bubble dynamics in reactive flows, crucial for electrochemical systems like alkaline water electrolysis. The new model accurately predicts bubble growth and behavior, enhancing hydrogen production efficiency.

Keywords:
bubble growth and risinginterfacial mass transferphysicochemical hydrodynamicsreactive flows-CLSVOFtransport of species

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Area of Science:

  • Multiphase flow dynamics
  • Computational fluid dynamics
  • Chemical engineering

Background:

  • Optimizing electrochemical systems like alkaline water electrolysis requires understanding bubble dynamics.
  • Accurate modeling of gas evolution and absorption in reactive flows is essential for efficiency.

Purpose of the Study:

  • To develop and verify a computational model for bubble dynamics in reactive two-phase flows.
  • To investigate the influence of species transport on bubble growth, shape, and velocity.

Main Methods:

  • Coupled level set and volume of fluid (CLSVOF) approach.
  • One-fluid transport of species model with source terms in conservation equations.
  • Verification against theoretical and experimental diffusion-controlled growth rates (R(t) ∝ t^0.5).

Main Results:

  • The CLSVOF model accurately captures bubble hydrodynamics and mass conservation.
  • The model reproduces diffusion-controlled bubble growth rates in reactive systems.
  • Simulations show species transport significantly impacts rising bubble velocity, shape, and wake concentration fields.

Conclusions:

  • The developed model provides a high-fidelity simulation of bubble dynamics in reactive flows.
  • This tool is essential for studying physicochemical hydrodynamics in multiphysics systems, including those with electric fields and chemical reactions.
  • Improved modeling can optimize electrochemical gas-evolving systems for enhanced efficiency in hydrogen production.