Separation Efficiency of Gas Mixture by Thermal Diffusion Column
1975 Volume 1 Issue 2 Pages 180-185
Details
1975 Volume 1 Issue 2 Pages 180-185
By using He-Ar gas mixture, the separation efficiency (η) of a thermal diffusion column was measured over a wide range of operating conditions. It was found that at large separation (dimensionless feed flow rate R=σF/Gnat≤0.2) the separation efficiency curve (β vs.η, β : cut) was independent of feed position (ζ0=LS/LT) and the maximum lay on PQ-line (P : β=CF, η=1;Q : β=0.5, η=0), but at small separation (0.2≤R≤ 0.4) the β that gave the maximum separation efficiency (ηmax), that is to say, βmax, was shifted from 0 to 1, as ζ0 was changed from 0 to 1, but the value of ηmax remained nearly constant. At still smaller separation (0.4 ≤ R< 0.6) the curve was gradually flattened.
By using the dimensionless feed flow rate R, all experimental data can be summarized on a single curve for different temperatures and feed gas concentrations. It was also found that the maximum separation efficiency decreases exponentially as feed flow rate increases, and is proportional to both the two-thirds power of temperature ratio (ΔT/T) and to the square root of feed gas concentration product CF (1-CF).
