Experimental and theoretical studies of transport phenomena in binary gas mixtures

Informations projet

N° de convention de subvention: INTAS-93-1399

Projet clôturé

Date de début 1 Octobre 1994

Date de fin 30 Septembre 1995

Financé au titre de

• International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993-

Coût total

Aucune donnée

Contribution de l’UE

€ 36 000,00

Coordonné par

Universidade Nova de Lisboa
Portugal

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Résultats exploitables

Transport phenomena in binary gas mixtures

The fundamental purpose of the research programme concerns theoretical and experimental studies of transport phenomena in binary gas mixtures: rare gas-simple polyatomic gas. Experiments on concentration diffusion and thermal diffusion in helium-carbon monoxide and argon-carbon monoxide systems have been carried out in a two bulbs apparatus at a pressure of 0.5 atmospheres. Data have been obtained for the concentration diffusion coefficient, D12 , and for the thermal diffusion factor, alphaT, for five temperatures in the range 308-356 K and, at each temperature, for three concentrations of the heavy component close to 25, 50 and 75 %. Theoretical comparisons for the system helium-carbon monoxide have already been studied, assuming the infinite order sudden approximation (IOSA) for the ab initio calculations. Seven potential energy surfaces have been considered: Thomas, Kraemer and Diercken potential (TKD potential); Gianturco et al. modification of the TKD potential (POT-11 potential); LeRoy et al. empirical anisotropic potentials, V(3,3,3) and XC9 ; three potentials proposed by Gianturco and Paesani calculated ab initio on the basis of the Hartrie-Fock approximation and on the theory of the density function. Ab initio calculations for potential energy surfaces for the argon-carbon monoxide system is intended. Experiments have also been carried out on concentration diffusion and thermal diffusion in mixtures of technical interest, namely in two helium-fluorocarbon systems that are important in environment studies related with the ozone layer of the Earth's atmosphere.