Abstract
In this paper, we consider a rarefied polyatomic gas with a non-polytropic equation of state. We use the variational procedure of maximum entropy principle (MEP) to obtain the closure of the binary hierarchy of 14 moments associated with the Boltzmann equation in which the distribution function depends also on the energy of internal modes. The closed partial differential system is symmetric hyperbolic and the Cauchy problem is well-posed. In the limiting case of polytropic gas in which the internal energy is a linear function of the temperature, we find, as a special case, the previous results of Pavić et al. (Physica A 392:1302–1317, 2013). This paper, therefore, completes the equivalence between the closure obtained in the phenomenological rational extended thermodynamics theory and the one obtained by the MEP for general non-polytropic gas.
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Acknowledgements
This paper is supported by GNFM/INdAM and is dedicated to my friends Masaru Sugiyama and Giuseppe Toscani for their 70-birthday. With Giuseppe I have come a long way together during our career even if I don’t have any jointly paper, he is certainly one of my closest friends and one of the best Italian mathematical physicists. Although I have many co-authors Masaru is the co-author with whom I have the most number of papers. We have known each other for over 20 years and we have always worked very well and in a complementary way on non-linear waves and in the construction of Extended Thermodynamics that also includes polyatomic gases. A relationship of great friendship was established with him over time. He is not only an excellent Mathematical Physicists but also is an exquisite, kind and lovable person. I express my most sincere wishes to both.
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Ruggeri, T. Maximum entropy principle closure for 14-moment system for a non-polytropic gas. Ricerche mat 70, 207–222 (2021). https://doi.org/10.1007/s11587-020-00510-y
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DOI: https://doi.org/10.1007/s11587-020-00510-y