The role of Debye–Hückel electronic energy levels on the thermodynamic properties of hydrogen plasmas including isentropic coefficients

Capitelli, M.; Giordano, D.; Colonna, G.
August 2008
Physics of Plasmas;Aug2008, Vol. 15 Issue 8, p082115
Academic Journal
A comparison between frozen, reactive, and total specific heats calculated by using energy levels derived from Coulomb and Debye–Hückel potentials is reported. Results for hydrogen plasmas in local thermodynamic equilibrium show that the use of Debye–Hückel energy levels increases the frozen specific heat of the mixture up to 40% as compared with the corresponding quantities obtained by using Coulomb energy levels, having an opposite effect on the reactive specific heat. The total specific heat of the plasma (the sum of frozen and reactive contributions) is less affected due to compensation effects. Results for the isentropic coefficient γ=cp/cv show a similar trend and warn on neglecting the electronic excitation in this coefficient.


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