2021/10/06 by A. R. Mendez, A. R. Méndez, Mendez, A. R. +6
Engineering · Mathematics · Physics and Astronomy · #Boltzmann constant #Boltzmann equation #Cauchy stress tensor #Classical mechanics #Degenerate energy levels #Dissipation #Energy flux #FOS: Physical sciences #Gas Dynamics and Kinetic Theory #Heat flux #Heat transfer #Kinetic energy #Kinetic theory #Limit (mathematics) #Mathematical analysis #Mathematics #Mechanics #Particle Dynamics in Fluid Flows #Physics #Quantum Gases (cond-mat.quant-gas) #Quantum Physics (quant-ph) #Quantum mechanics #Radiative Heat Transfer Studies #Relaxation (psychology) #Tensor (intrinsic definition) #Thermal conductivity #Thermodynamics #cond-mat.quant-gas #quant-ph
paper · pdf · doi:10.48550/arxiv.2110.03402
published in arXiv (Cornell University) (Cornell University)
arxiv created 2021/10/06 · openalex publication_date 2021/10/06 · arxiv updated 2021/10/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The complete set of transport coefficients for two dimensional relativistic degenerate gases is derived within a relaxation approximation in kinetic theory, by considering both the particle and energy frames. A thorough comparison between Marle and Anderson-Witting's models is carried out, pointing out the drawbacks of the former when compared both to the latter and to the full Boltzmann equation results in the non-degenerate limit. Such task is accomplished by solving the relativistic Uehling-Uhlenbeck equation, in both the particle and energy frames, in order to establish the constitutive equations for the heat flux and the Navier tensor together with analytical expressions for the transport coefficients in such representations. In particular, the temperature dependence of the thermal conductivity (associated with a generalized thermal force) and the bulk and shear viscosities are analyzed and compared within both models and with the non-degenerate, non-relativistic and ultra-relativistic limits.