Hugues HINGANA - Academia.edu (original) (raw)
Papers by Hugues HINGANA
HAL (Le Centre pour la Communication Scientifique Directe), 2011
This paper deals with the calculation of two-temperature (2T) oxygen, nitrogen, air and argon pla... more This paper deals with the calculation of two-temperature (2T) oxygen, nitrogen, air and argon plasma properties (compositions, thermodynamic properties and transport coefficients). 3 different techniques are developed and confronted to obtain the plasma composition: a steady-state collisional-radiative (CR) model, a transient kinetic model and a simplified model based upon a 2T mass action law. Thermodynamic properties are than calculated analytically and transport coefficients are obtained from recent theoretical developments.
HAL (Le Centre pour la Communication Scientifique Directe), 2007
HAL (Le Centre pour la Communication Scientifique Directe), 2007
Journal of Physics D, Nov 25, 2011
This paper is devoted to the calculation of equilibrium compositions, thermodynamic properties (m... more This paper is devoted to the calculation of equilibrium compositions, thermodynamic properties (mass density, enthalpy and specific heat at constant pressure) and transport coefficients (viscosity, electrical conductivity and thermal conductivity) of air/CO2/N2–CF3I mixtures. These data are computed in the temperature range 300 K–50 kK and pressure between 1 and 32 bar. Results obtained for pure gases (CF3I, CO2, air and N2) are systematically compared with SF6. Transport coefficients for N2, CO2, CF3I and mixtures of CO2, N2 or air with CF3I are also confronted with previous published values. Particular attention is paid to the collision integral database by the use of the most accurate and recent cross-sections or interaction potentials available in the literature.
Contribution to the study of properties of two-temperature plasmas-Application to Argon and Air.
HAL (Le Centre pour la Communication Scientifique Directe), 2007
Electric arcs and thermal plasmas are often studied under the assumption of local thermodynamic e... more Electric arcs and thermal plasmas are often studied under the assumption of local thermodynamic equilibrium (LTE). In this case, the particles have all the same average kinetic energy and it is possible to define a single temperature for the whole set of chemical species inside the mixture. However, it is well known that the LTE assumption is not valid any more in some particular areas of the plasma: in the close vicinity of the electrodes (cathode and anode sheaths) and the walls (torch nozzles or circuit breaker insulator walls), and in the external zones of the arc where the turbulence phenomenon and the pumping of surrounding cold gas play a significant role. The LTE assumption is also dubious during arc decay or within the plasma column in the case of low power arcs. In this last case, the temperature on the axis of the plasma remains relatively low. Thus the collisions are not enough efficient to ensure an equal distribution of the energy between the various chemical species. ...
Dans le domaine des plasmas thermiques, de nombreux procedes industriels sont caracterises en sup... more Dans le domaine des plasmas thermiques, de nombreux procedes industriels sont caracterises en supposant l'equilibre thermique. Cependant ces conditions d'equilibre ne sont pas remplies pres des bords des plasmas crees par des arcs electriques ou des jets de plasmas. Les ecarts a l'equilibre modifient alors considerablement la cinetique chimique du milieu et peuvent affecter le procede etudie. La comprehension, l'analyse et la prediction de ces procedes demandent alors une modelisation physique du plasma a deux temperatures (2T). Cette modelisation s'appuie sur le calcul prealable des proprietes du plasma 2T, calcul qui fait l'objet de cette these. La premiere partie de ce travail est consacree au calcul de la composition d'un plasma a 2T. Il existe dans la litterature plusieurs theories permettant de calculer les densites des especes pour un plasma hors equilibre mais l'originalite de ce travail se trouve dans l'etablissement d'une loi « pseud...
... membres de l'équipe AEPPT, d'abord ... more ... membres de l'équipe AEPPT, d'abord les « permanents » : Pierre FRETON, pour les enseignements en électroniques, Matthieu MASQUÈRE, Flavien VALENSI et ... Et merci au dernier à avoir partagé mon bureau Mister Christopher JAN pour sa vision et son humour décalés. ...
RESUME, 2010
... membres de l'équipe AEPPT, d'abord ... more ... membres de l'équipe AEPPT, d'abord les « permanents » : Pierre FRETON, pour les enseignements en électroniques, Matthieu MASQUÈRE, Flavien VALENSI et ... Et merci au dernier à avoir partagé mon bureau Mister Christopher JAN pour sa vision et son humour décalés. ...
Dans le domaine des plasmas thermiques, de nombreux procédés industriels sont caractérisés en sup... more Dans le domaine des plasmas thermiques, de nombreux procédés industriels sont caractérisés en supposant l'équilibre thermique. Cependant ces conditions d'équilibre ne sont pas remplies près des bords des plasmas crées par des arcs électriques ou des jets de plasmas. Les écarts à l'équilibre modifient alors considérablement la cinétique chimique du milieu et peuvent affecter le procédé étudié. La compréhension, l'analyse et la prédiction de ces procédés demandent alors une modélisation physique du plasma à 2 températures (2T). Cette modélisation s'appuie sur le calcul préalable des propriétés du plasma 2T, calcul qui fait l'objet de cette thèse.
Journal of Physics D: Applied Physics, 2011
This paper is devoted to the calculation of equilibrium compositions, thermodynamic properties (m... more This paper is devoted to the calculation of equilibrium compositions, thermodynamic properties (mass density, enthalpy and specific heat at constant pressure) and transport coefficients (viscosity, electrical conductivity and thermal conductivity) of air/CO 2 /N 2 -CF 3 I mixtures. These data are computed in the temperature range 300 K-50 kK and pressure between 1 and 32 bar. Results obtained for pure gases (CF 3 I, CO 2 , air and N 2 ) are systematically compared with SF 6 . Transport coefficients for N 2 , CO 2 , CF 3 I and mixtures of CO 2 , N 2 or air with CF 3 I are also confronted with previous published values. Particular attention is paid to the collision integral database by the use of the most accurate and recent cross-sections or interaction potentials available in the literature.
This study concerns the calculation of two-temperature (2T) compositions of stationary and homoge... more This study concerns the calculation of two-temperature (2T) compositions of stationary and homogeneous air and water plasmas at atmospheric pressure. A complete collisional-radiative (CR) model already developed in our laboratory is compared with a pseudo-kinetic (PK) model based upon the 2T mass action law and upon the calculation of an excitation temperature T ex (varying between T e and T h respectively electron and heavy particles temperatures) from simplified kinetic considerations. Significant discrepancies are observed between the two models in the temperature range corresponding to the transition between the domination of heavy particle reactions and electron collisions.
HAL (Le Centre pour la Communication Scientifique Directe), 2011
This paper deals with the calculation of two-temperature (2T) oxygen, nitrogen, air and argon pla... more This paper deals with the calculation of two-temperature (2T) oxygen, nitrogen, air and argon plasma properties (compositions, thermodynamic properties and transport coefficients). 3 different techniques are developed and confronted to obtain the plasma composition: a steady-state collisional-radiative (CR) model, a transient kinetic model and a simplified model based upon a 2T mass action law. Thermodynamic properties are than calculated analytically and transport coefficients are obtained from recent theoretical developments.
HAL (Le Centre pour la Communication Scientifique Directe), 2007
HAL (Le Centre pour la Communication Scientifique Directe), 2007
Journal of Physics D, Nov 25, 2011
This paper is devoted to the calculation of equilibrium compositions, thermodynamic properties (m... more This paper is devoted to the calculation of equilibrium compositions, thermodynamic properties (mass density, enthalpy and specific heat at constant pressure) and transport coefficients (viscosity, electrical conductivity and thermal conductivity) of air/CO2/N2–CF3I mixtures. These data are computed in the temperature range 300 K–50 kK and pressure between 1 and 32 bar. Results obtained for pure gases (CF3I, CO2, air and N2) are systematically compared with SF6. Transport coefficients for N2, CO2, CF3I and mixtures of CO2, N2 or air with CF3I are also confronted with previous published values. Particular attention is paid to the collision integral database by the use of the most accurate and recent cross-sections or interaction potentials available in the literature.
Contribution to the study of properties of two-temperature plasmas-Application to Argon and Air.
HAL (Le Centre pour la Communication Scientifique Directe), 2007
Electric arcs and thermal plasmas are often studied under the assumption of local thermodynamic e... more Electric arcs and thermal plasmas are often studied under the assumption of local thermodynamic equilibrium (LTE). In this case, the particles have all the same average kinetic energy and it is possible to define a single temperature for the whole set of chemical species inside the mixture. However, it is well known that the LTE assumption is not valid any more in some particular areas of the plasma: in the close vicinity of the electrodes (cathode and anode sheaths) and the walls (torch nozzles or circuit breaker insulator walls), and in the external zones of the arc where the turbulence phenomenon and the pumping of surrounding cold gas play a significant role. The LTE assumption is also dubious during arc decay or within the plasma column in the case of low power arcs. In this last case, the temperature on the axis of the plasma remains relatively low. Thus the collisions are not enough efficient to ensure an equal distribution of the energy between the various chemical species. ...
Dans le domaine des plasmas thermiques, de nombreux procedes industriels sont caracterises en sup... more Dans le domaine des plasmas thermiques, de nombreux procedes industriels sont caracterises en supposant l'equilibre thermique. Cependant ces conditions d'equilibre ne sont pas remplies pres des bords des plasmas crees par des arcs electriques ou des jets de plasmas. Les ecarts a l'equilibre modifient alors considerablement la cinetique chimique du milieu et peuvent affecter le procede etudie. La comprehension, l'analyse et la prediction de ces procedes demandent alors une modelisation physique du plasma a deux temperatures (2T). Cette modelisation s'appuie sur le calcul prealable des proprietes du plasma 2T, calcul qui fait l'objet de cette these. La premiere partie de ce travail est consacree au calcul de la composition d'un plasma a 2T. Il existe dans la litterature plusieurs theories permettant de calculer les densites des especes pour un plasma hors equilibre mais l'originalite de ce travail se trouve dans l'etablissement d'une loi « pseud...
... membres de l'équipe AEPPT, d'abord ... more ... membres de l'équipe AEPPT, d'abord les « permanents » : Pierre FRETON, pour les enseignements en électroniques, Matthieu MASQUÈRE, Flavien VALENSI et ... Et merci au dernier à avoir partagé mon bureau Mister Christopher JAN pour sa vision et son humour décalés. ...
RESUME, 2010
... membres de l'équipe AEPPT, d'abord ... more ... membres de l'équipe AEPPT, d'abord les « permanents » : Pierre FRETON, pour les enseignements en électroniques, Matthieu MASQUÈRE, Flavien VALENSI et ... Et merci au dernier à avoir partagé mon bureau Mister Christopher JAN pour sa vision et son humour décalés. ...
Dans le domaine des plasmas thermiques, de nombreux procédés industriels sont caractérisés en sup... more Dans le domaine des plasmas thermiques, de nombreux procédés industriels sont caractérisés en supposant l'équilibre thermique. Cependant ces conditions d'équilibre ne sont pas remplies près des bords des plasmas crées par des arcs électriques ou des jets de plasmas. Les écarts à l'équilibre modifient alors considérablement la cinétique chimique du milieu et peuvent affecter le procédé étudié. La compréhension, l'analyse et la prédiction de ces procédés demandent alors une modélisation physique du plasma à 2 températures (2T). Cette modélisation s'appuie sur le calcul préalable des propriétés du plasma 2T, calcul qui fait l'objet de cette thèse.
Journal of Physics D: Applied Physics, 2011
This paper is devoted to the calculation of equilibrium compositions, thermodynamic properties (m... more This paper is devoted to the calculation of equilibrium compositions, thermodynamic properties (mass density, enthalpy and specific heat at constant pressure) and transport coefficients (viscosity, electrical conductivity and thermal conductivity) of air/CO 2 /N 2 -CF 3 I mixtures. These data are computed in the temperature range 300 K-50 kK and pressure between 1 and 32 bar. Results obtained for pure gases (CF 3 I, CO 2 , air and N 2 ) are systematically compared with SF 6 . Transport coefficients for N 2 , CO 2 , CF 3 I and mixtures of CO 2 , N 2 or air with CF 3 I are also confronted with previous published values. Particular attention is paid to the collision integral database by the use of the most accurate and recent cross-sections or interaction potentials available in the literature.
This study concerns the calculation of two-temperature (2T) compositions of stationary and homoge... more This study concerns the calculation of two-temperature (2T) compositions of stationary and homogeneous air and water plasmas at atmospheric pressure. A complete collisional-radiative (CR) model already developed in our laboratory is compared with a pseudo-kinetic (PK) model based upon the 2T mass action law and upon the calculation of an excitation temperature T ex (varying between T e and T h respectively electron and heavy particles temperatures) from simplified kinetic considerations. Significant discrepancies are observed between the two models in the temperature range corresponding to the transition between the domination of heavy particle reactions and electron collisions.