The theory for enrichment of heavy water by thermal diffusion in a countercurrent-flow inclined Frazier scheme was developed and investigated. The equations for the optimal angles of inclination and the corresponding best performance were derived. Considerable improvement in performance is obtained when the Frazier scheme is operated at the optimal angle of inclination. Further improvement can be achieved if the operation is conducted in countercurrent flow instead of concurrent flow.
Separation Science and Technology 36(13), pp.3015-3026