The contribution of electronic excitation to the total specific heats of high temperature gases: a misinterpreted absence

Capitelli, M.; Ficocelli, E.

doi:10.1017/s0022377800005596

Cited by 7 publications

(3 citation statements)

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“…We see that in this case the differences, even still existing, strongly decrease, the maximum deviation being of the order of few per cent. This point, already reported by one of the present authors many years ago [32], should not confuse the reader on the importance of the EESs in affecting the thermodynamic properties of thermal plasmas.…”

Section: Thermodynamic Propertiessupporting

confidence: 73%

“…The role of EESs in affecting the transport properties of the thermal plasmas is a topic of renewed interest as attested by numerous contributions appearing in the literature [27,28,[32][33][34][35][36][37]. EESs modify the composition and the thermodynamic (internal energy, specific heat) properties of the plasma, both quantities entering in the relevant transport equations.…”

Section: Transport Propertiesmentioning

confidence: 99%

“…In order to properly account for the presence of the EES, each electronic excited state of the hydrogen atom, H(n), n being the principal quantum number, is considered as a separate species. The collision integrals for the relevant interactions among H(n), H + and electrons are the same used in our previous works [32,33]. They present a strong dependence on the principal quantum number especially for collision integrals diffusion-type of H(n)-H + collisions.…”

Section: Collision Integrals Of Eessmentioning

confidence: 99%

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Thermodynamics and transport properties of thermal plasmas: the role of electronic excitation

Capitelli¹,

Bruno²,

Colonna³

et al. 2009

J. Phys. D: Appl. Phys.

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The role of electronic excited states in affecting the thermodynamic and transport properties of thermal plasma is investigated in the temperature range [300–100 000 K] and in the pressure range [1–103 atm] for hydrogen and [10−2–103 atm] for nitrogen. Thermodynamic functions have been calculated modelling in different ways the electronic levels of atomic species (ground-state, Debye–Hückel and confined-atom approximations). Frozen and reactive specific heats as well as isentropic coefficients are strongly affected by the electronic excitation whereas compensation effects smooth its influence on the total specific heat, i.e. the sum of frozen and reactive contributions. Higher-order approximations of the Chapman–Enskog method have been used to evaluate transport coefficients, including electronically excited states as separate species. The importance of a state-to-state approach to calculate transport coefficients is presented taking into account the strong dependence of transport cross sections on the principal quantum number. Results for hydrogen, nitrogen and air plasmas are widely discussed.

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Section: Thermodynamic Propertiessupporting

confidence: 73%