Community Research and Development Information Service - CORDIS

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.

Reported by

Universidade Nova de Lisboa
Quinta da Torre
2825 Monte da Caparica
Portugal
See on map
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top