A new device that divides the Clusius-Dickel thermal-diffusion column into two subchannels by inserting a permeable-barrier resulting in improving the separation efficiency for heavy water system was investigated analytically. The analytical solutions were obtained by using the separated variables with an orthogonal expansion technique in the terms of power series. The theoretical predictions were represented graphically with feed mass flow rate, feed fraction concentration, aspect ratio and channel thickness ratio as parameters and compared to classical Clusius-Dickel column of the same working dimensions. Considerable separation efficiency improvements on heavy water enrichment were obtained by employing such double-flow devices with inserting a permeable-barrier, instead of using the Clusius-Dickel thermal-diffusion column.
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