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Modelling Thermally Induced Non-Equilibrium Gas Flows by Coupling Kinetic and Extended Thermodynamic Methods.

Weiqi Yang1,2,3, Xiao-Jun Gu2, David R Emerson2

  • 1School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China.

Entropy (Basel, Switzerland)
|December 3, 2020
PubMed
Summary
This summary is machine-generated.

A new hybrid method combining macroscopic and microscopic approaches accurately simulates thermally induced non-equilibrium gas flows. This approach enhances accuracy and efficiency across a wider range of conditions compared to existing methods.

Keywords:
discrete velocity methodmoment methodnon-equilibrium flowthermally induced flowtransition regime

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Area of Science:

  • Fluid Dynamics
  • Non-equilibrium Thermodynamics
  • Computational Physics

Background:

  • Thermally induced non-equilibrium gas flows are crucial in microfluidic devices and vacuum systems.
  • Existing methods like the regularised 26 (R26) moment equations face limitations in accuracy at higher Knudsen numbers.
  • Kinetic methods, while accurate, can be computationally expensive.

Purpose of the Study:

  • To develop and validate a hybrid computational approach for simulating thermally induced non-equilibrium gas flows.
  • To overcome the limitations of purely macroscopic or microscopic methods in the transition flow regime.
  • To improve the accuracy and computational efficiency of gas flow simulations.

Main Methods:

  • Coupling kinetic and extended thermodynamic methods.
  • Employing a hybrid discrete velocity method (DVM) for near-wall regions and R26 moment equations for bulk flow.
  • Simulating three types of flows: temperature-discontinuity-induced, temperature-gradient-induced, and radiometric flows.

Main Results:

  • The hybrid DVM/R26 method accurately simulates thermally induced non-equilibrium flows.
  • The hybrid approach demonstrates improved accuracy and validity compared to the R26 equations alone.
  • The method extends the capability to a wider range of Knudsen numbers.

Conclusions:

  • The hybrid DVM/R26 scheme is a reliable and effective method for simulating non-equilibrium gas flows.
  • This approach offers enhanced accuracy and broader applicability than traditional R26 methods.
  • The hybrid method provides a computationally efficient alternative to pure kinetic methods like DVM.