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The energy consumption of the separation nozzle process for enrichment of U 235  is discussed in terms of the entropy production in the separation system. Experimental results obtained from measurements with Pitot type pressure probes and a numerical Navier-Stokes analysis of the nozzle flow show that ordinary viscous dissipation is the most important entropy production mechanism. The relatively large amount of kinetic energy observed at the end of the nozzle indicates some possibilities of lowering the specific energy consumption of the process.

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Die physikalischen Grundlagen der Uran 235 -Anreicherung nach dem Trenndüsenverfahren / The Physics of Uranium 235 -Enrichment in the Separation Nozzle Process: III. Die Medianismen der Entropieerzeugung in der Trenndüsenströmung / III. The Mechanisms of Entropy Production in the Separation Nozzle Flow