Production of value and entropy in separation nozzles. Numerical calculations based on molecular probe measurements
Description
The effects exerted by separation of the heavy component and the light auxiliary gas, strong variations in the state of the gas in the direction of flow, and strong deviations from local equilibrium upon both isotope separation and pressure losses in separation nozzles are studied. The flow field and the separation of the heavy and light components are investigated. This simulation shows that the separation of the heavy component and the auxiliary gas results in a damping of isotope separation near the curved wall of the nozzle. The strong variations in the state of the gas in the direction of flow result in a large velocity slip between the components in the inner regions of flow. The examination of the local production of entropy shows that the diffusion of the heavy component through the light auxiliary gas may cause up to 30% of the total pressure losses. (orig./HP)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Die Auswirkungen der Gemischtrennung, starker azimutaler Zustandsaenderungen und starker Abweichungen vom lokalen Gleichgewicht auf die Isotopentrennung und die Verlustprozesse in der Trennduese werden untersucht. Die Simulationsrechnungen zur Isotopenentmischung zeigen, dass die Abtrennung der schweren Komponente vom Zusatzgas zu einer starken Daempfung der Isotopenentmischung nahe der Umlenkwand fuehrt. Die azimutale Zustandsaenderungen fuehren im typischen Knudsenzahlbereich auf den inneren Stromflaechen zu einem starken Geschwindigkeitsschlupf zwischen den Komponenten. Die Relativbewegung der Gemischkomponenten beim Zusatzgas He verursacht bis zu etwa einem Drittel der Gesamtverluste. (orig./HP)
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Additional details
Additional titles
- Original title (German)
- Berechnung der Wert- und Entropieerzeugung in der Trennduese auf der Basis von Molekularsondenmessungen
Publishing Information
- Imprint Pagination
- 130 p.
- Report number
- KFK--3793
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 16024527
- Subject category
- S11: NUCLEAR FUEL CYCLE AND FUEL MATERIALS;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- ENTROPY; KNUDSEN FLOW; SEPARATION NOZZLE METHOD; SLIP FLOW
- Descriptors DEC
- FLUID FLOW; GAS FLOW; ISOTOPE SEPARATION; PHYSICAL PROPERTIES; SEPARATION PROCESSES; THERMODYNAMIC PROPERTIES