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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
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Lattice-Boltzmann-based two-phase thermal model for simulating phase change.

M R Kamali1, J J J Gillissen, H E A van den Akker

  • 1Transport Phenomena Group, Department of Chemical Engineering, Delft University of Technology, Delft, Netherlands.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 16, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a lattice Boltzmann (LB) method for two-phase energy conservation with phase change. The novel approach accurately models heat transfer and phase transitions in complex fluid systems.

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Area of Science:

  • Computational Fluid Dynamics
  • Thermodynamics
  • Chemical Engineering

Background:

  • Accurate simulation of two-phase flow with phase change is crucial for many engineering applications.
  • Existing methods often struggle to efficiently incorporate complex thermodynamic effects like phase transitions.
  • The lattice Boltzmann (LB) method offers a promising alternative for mesoscopic simulations.

Purpose of the Study:

  • To develop and validate a lattice Boltzmann method for solving the energy conservation equation in two-phase systems with phase change.
  • To incorporate nonideal equations of state and enthalpy transport within the LB framework.
  • To provide a robust numerical tool for simulating complex thermophysical phenomena.

Main Methods:

  • A multi-distribution function lattice Boltzmann approach was employed.
  • A pseudopotential model was used to implement a nonideal equation of state (EOS).
  • The energy equation was coupled with species transport and interaction forces via a filtered pseudotemperature field.

Main Results:

  • The proposed LB method successfully incorporates phase change effects into the energy conservation equation.
  • The model accounts for heats of reaction, enthalpy changes during phase transitions, and diffusive enthalpy transport.
  • Validation against analytical solutions confirmed the accuracy of the developed scheme.

Conclusions:

  • The presented lattice Boltzmann method provides an effective framework for simulating two-phase energy conservation with phase change.
  • This approach offers a computationally efficient and accurate alternative to traditional methods.
  • The validated scheme has potential applications in various fields, including chemical engineering and materials science.