The functional relationship of the column calibration factor in thermal diffusion column measurement

An approximate formulation of the column calibration factor (CCF), , at any given temperature is derived for thermal diffusion columns (TDC) from the Navier-Stokes equation in cylindrical coordinates. The values of are then used to estimate the experimental thermal diffusion factor of a neon gas mixture with its natural isotopic abundances from measured in four columns of different column geometries. The molecular force parameters of the molecule are estimated from the intercepts and slopes of the linear variations of and the collision integral against and respectively. The excellent agreement of the estimated force parameters with the available literature values and the comparison of the temperature variation of by the CCF method with the existing experimental and theoretical ones establish the fact that the derived relationship of with the column geometries is more than adequate.