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Rheological modelling of viscoelastic fluid in a generic gap of screw pump

Mehrnia, Seyedmajid ; Kerres, Lara ; Kuhr, Maximilian M. G. ; Pelz, Peter F. (2024)
Rheological modelling of viscoelastic fluid in a generic gap of screw pump.
International Conference on Screw Machines (ICSM 2022). Dortmund, Germany (07.09. - 08.09.2022)
doi: 10.26083/tuprints-00026566
Conference or Workshop Item, Secondary publication, Publisher's Version

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Item Type: Conference or Workshop Item
Type of entry: Secondary publication
Title: Rheological modelling of viscoelastic fluid in a generic gap of screw pump
Language: English
Date: 29 January 2024
Place of Publication: Darmstadt
Year of primary publication: 2022
Place of primary publication: London [u.a.]
Publisher: IOP Publishing
Journal or Publication Title: IOP Conference Series: Materials Science and Engineering
Volume of the journal: 1267
Collation: 14 Seiten
Event Title: International Conference on Screw Machines (ICSM 2022)
Event Location: Dortmund, Germany
Event Dates: 07.09. - 08.09.2022
DOI: 10.26083/tuprints-00026566
Corresponding Links:
Origin: Secondary publication service

In this study, the leakage of a non-Newtonian fluid, i.e. silicone oil, in a generic gap was numerically investigated. A CFD tool is used to determine the relationship between leakage flow, gap length and pressure difference. The investigated fluid is viscoelastic and its properties are modelled by a Maxwell equation. The Maxwell model can be used to precisely define the phenomenon of stress relaxation. Moreover, a comparison of the viscosity of measured data with simplified models shows that the Maxwell model is best suited for viscosity prediction. Furthermore, simulation results showed that at low pressures, leakage is reduced by decreasing the gap angle. However, this effect changes with increasing viscosity and relaxation time of the molecule. To determine the pressure drop, the Bagley plot is used. The results confirmed that as the shear rate increases, the elastic pressure drop values increase. In addition, the leakage flow increases with an increasing slenderness ratio.

Identification Number: Artikel-ID: 012013
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-265661
Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering > Institute for Fluid Systems (FST) (since 01.10.2006)
Date Deposited: 29 Jan 2024 10:52
Last Modified: 06 Feb 2024 07:48
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/26566
PPN: 515247499
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