Basic Equations of Gasdynamics
The evolution of elementary fluid particles (in the ‘continuum’ sense) is characterized by exchanges of energy, momentum and mass with their environment. When they have comparatively large total energy density a number of “internal rate processes” can also take place. Any elementary fluid particle is in this case a “composite system” whose subsystems interact through a number of exchanges of energy and mass. The mass exchanges derive from alterations of the molecular structures of the constituent gasses, i.e. from chemical reactions. The energy exchanges derive from redistributions of energy among the different degrees of freedom of the molecules, including the “excitation” of internal degrees which are usually “unexcited” at lower energy density levels.
KeywordsBasic Equation Entropy Production Diffusive Flux Thermodynamic Potential Vectorial Flux
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