Soret coefficient

Soret coefficient

[sȯ′rā ‚kō·i‚fish·ənt]
(physics)
A tabulated value used in binary thermal diffusion calculations in gaseous systems; expressed as D ′/ D = α X1 X2, where D ′ is the coefficient of thermal diffusion, D is the coefficient of ordinary diffusion, α is the thermal diffusion constant, X1 is the mole fraction of the lower-molecular-weight component, and X2 is the mole fraction of the higher-molecular-weight component.
References in periodicals archive ?
In this study we are concerned with fluids such that the Dufour coefficient is set equal to zero since his orders of magnitude is sufficiently smaller than the Soret coefficient. The density of the binary solution is assumed to be a linear function of temperature and composition, i.e.
Saghir's project, called the Soret Coefficient in Crude Oil experiment (or SCCO), aims to determine the Soret coefficient for mixtures of oil.
The sense of migration of the molecular species be determined by the sign of Soret coefficient. The Soret effect for instance, has been utilized for isotope separation and in mixtures between gases with very low molecular weight H2 or He and the medium molecular weight [N.sub.2] or air.