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Open Physics

formerly Central European Journal of Physics

Editor-in-Chief: Seidel, Sally

Managing Editor: Lesna-Szreter, Paulina

IMPACT FACTOR 2017: 0.755
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ICV 2017: 162.45

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Volume 10, Issue 6


Volume 13 (2015)

Comparison of viscosities from the Chapman-Enskog and relaxation time methods

Anton Wiranata
  • IOPP, Central China Normal University, Wuhan, 430079, China
  • Lawrence Berkeley National Laboratory, Nuclear Science Division, MS 70R0319, Berkeley, CA, 94720, USA
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/ Madappa Prakash / Purnendu Chakraborty
Published Online: 2012-12-04 | DOI: https://doi.org/10.2478/s11534-012-0082-3


A quantitative comparison between the results of shear viscosities from the Chapman-Enskog and relaxation time methods is performed for selected test cases with specified elastic differential cross sections: (i) the non-relativistic, relativistic and ultra-relativistic hard sphere gas with angle and energy independent differntial cross section, (ii) the Maxwell gas, (iii) chiral pions and (iv) massive pions. Our quantitative results reveal that the extent of agreement (or disagreement) depends very sensitively on the energy dependence of the differential cross sections employed.

Keywords: shear viscosity; Chapman-Enskog approximation; relaxation time approximation

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About the article

Published Online: 2012-12-04

Published in Print: 2012-12-01

Citation Information: Open Physics, Volume 10, Issue 6, Pages 1349–1351, ISSN (Online) 2391-5471, DOI: https://doi.org/10.2478/s11534-012-0082-3.

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© 2012 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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