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Macroscopic State of Gases in a Light Field
Author(s) -
Nienhuis G.,
van Enk S. J.
Publication year - 1991
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19915030115
Subject(s) - physics , diffusion , component (thermodynamics) , field (mathematics) , convection–diffusion equation , mechanics , statistical physics , thermodynamics , mathematics , pure mathematics
We consider a gas or a gas mixture in a radiation field. The microscopic evolution equations for the distribution functions for the various particle states are separated into a rapid and a slow time scale. This separation defines the relevant quantities that specify the macroscopic state of the system. The evolution equations for the macroscopic variables take the form of a modified diffusion equation in the case of a dilute vapor in a buffer gas, and of generalized Navier‐Stokes equations for a single‐component gas. The equations contain light‐induced fluxes as source terms, and the transport coefficients are modified by the light.