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Shock-wave structure according to a linear irreversible thermodynamic model.

R M Velasco1, F J Uribe1

  • 1Department of Physics, Universidad Autónoma Metropolitana-Iztapalapa, C.P. 09340, México D.F., México.

Physical Review. E
|April 3, 2019
PubMed
Summary

This study introduces a new model for understanding shock-wave structures in monatomic gases. The model, based on irreversible thermodynamics, reveals a novel coupling between stress and heat flux, validated by experimental data.

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Area of Science:

  • Physics
  • Thermodynamics
  • Fluid Dynamics

Background:

  • Shock-wave propagation in gases creates complex structures.
  • Understanding these structures is crucial for various physical phenomena.
  • Dilute monatomic gases present unique challenges in shock-wave modeling.

Purpose of the Study:

  • To develop a phenomenological model for improved shock-wave structure understanding.
  • To investigate the flow anisotropy induced by shock-wave propagation.
  • To explore a new coupling between stress tensor and heat flux.

Main Methods:

  • Utilized principles of linear irreversible thermodynamics.
  • Incorporated flow anisotropy caused by shock-wave propagation.
  • Developed a novel coupling mechanism between stress tensor and heat flux.

Main Results:

  • The proposed phenomenological model offers a better understanding of shock-wave structures.
  • A new coupling between the stress tensor and heat flux was identified.
  • Model predictions align with experimental data for argon.

Conclusions:

  • The model provides a valuable framework for analyzing shock waves in dilute monatomic gases.
  • The identified coupling is a significant finding supported by simulations and experiments.
  • This work advances the theoretical understanding of shock-wave phenomena.