Eindimensionale Modellierung von Spaltstromungen in Schraubenvakuumpumpen

By (author) Timo Junemann

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Extent: 169 pages

Publisher: Logos Verlag Berlin

Subjects: Technical Sciences: Computer Science, Engineering, IT, & Math

Series: Schriftenreihe des Fachgebietes Fluidtechnik

Series volume number: 8

Language: German

Paperback (Published)

(July 2025)

ISBN: 9783832559502

6.65 x 9.45 inches

Price: $84.00

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Technische Vakua sind essenziell fur die Herstellung zahlreicher Alltagsprodukte und unverzichtbar fur moderne Industrien. Die Effizienz von Schraubenvakuumpumpen wird massgeblich von den internen Leckagen beeinflusst, die durch betriebsbedingte Spalte entstehen. Gepragt wird die Spaltstromung von der Gasverdunnung, die von der Kontinuumsstromung bis zur molekularen Stromung reicht. In diesem Band wird eine eindimensionale Theorie prasentiert, die Modellansatze aus dem Bereich der kompressiblen Gasstromungen und der verdunnten Stromungen zu einem umfassenden Modell fur den gesamten Bereich der Gasverdunnung zusammenfasst. Dabei wird gezeigt, dass die erforderlichen Modellgleichungen ohne einschrankende Annahmen aus der kinetischen Gastheorie abgeleitet werden konnen. Zur Bestimmung der Dissipation werden Modelle entwickelt, die die Einflusse der bewegten Wand, der Gasverdunnung und der stationaren Tragheitskrafte berucksichtigen. Besonderer Wert wird auf die Einfachheit der Modelle gelegt, sodass Leser*innen aus Industrie und Forschung sie muhelos in ihre eigenen Simulationswerkzeuge implementieren konnen. Die Theorie eignet sich hervorragend, um im Rahmen einer Kammermodellsimulation die innere Leckage von Schraubenvakuumpumpen zu bestimmen. Ihre Validierung durch experimentelle Daten bestatigt die hohe Genauigkeit der Theorie und unterstreicht ihre Anwendbarkeit fur unterschiedliche Spaltgeometrien.

  • By (author) Timo Junemann

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