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Generalized Energy-Conserving Dissipative Particle Dynamics with Mass Transfer. Part 2: Applications and

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This study verifies a new computational method, generalized energy-conserving dissipative particle dynamics with mass transfer (GenDPDE-M), for simulating particle diffusion. The method accurately models mass transfer in mixtures, offering practical applications for researchers.

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Area of Science:

  • Computational physics
  • Materials science
  • Chemical engineering

Background:

  • Coarse-grain particle modeling requires methods to simulate diffusion via mass transfer.
  • Existing methods have limitations in capturing mass transfer phenomena.
  • Part 1 introduced the generalized energy-conserving dissipative particle dynamics with mass transfer (GenDPDE-M) method.

Purpose of the Study:

  • To provide further verification and demonstration of the GenDPDE-M method.
  • To present practical considerations and implementation details for practitioners.
  • To extend the applicability of the method to various equations of state and mixtures.

Main Methods:

  • The GenDPDE-M method was applied to mesoparticles with embedded binary mixtures.
  • Simulations used ideal gas (IG) and van der Waals (vdW) equations of state (EoS).
  • A numerical discretization algorithm for equations of motion was developed and discussed.

Main Results:

  • GenDPDE-M successfully reproduced particle distributions predicted by Monte Carlo simulations for IG and vdW fluids.
  • The method demonstrated effectiveness under both equilibrium and non-equilibrium conditions.
  • Mesoparticle mass remained constant during interparticle mass exchange.

Conclusions:

  • The GenDPDE-M method is a validated and practical tool for simulating mass transfer in particle systems.
  • The method is applicable to multi-component mixtures and various fundamental and advanced EoS models.
  • This work addresses a significant gap in computational capabilities for particle-based simulations involving diffusion.