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Influence of Temperature and Shear Rate on the Slip Length in the Hydrodynamic Lubrication for a Polyalphaolefin

Corneli, Tobias ; Pelz, Peter F. ; Ludwig, Gerhard (2022)
Influence of Temperature and Shear Rate on the Slip Length in the Hydrodynamic Lubrication for a Polyalphaolefin.
19th International Sealing Conference. Stuttgart (12.10.-13.10.2016)
doi: 10.26083/tuprints-00020898
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: Influence of Temperature and Shear Rate on the Slip Length in the Hydrodynamic Lubrication for a Polyalphaolefin
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2016
Publisher: VDMA Fluidtechnik
Book Title: 19th International Sealing Conference, 12.10. - 13.10. 2016, Stuttgart
Event Title: 19th International Sealing Conference
Event Location: Stuttgart
Event Dates: 12.10.-13.10.2016
DOI: 10.26083/tuprints-00020898
Origin: Secondary publication service

Generally sealing systems are designed by means of elasto-hydrodynamics. In this case, the no slip boundary condition is applied to the solid walls for solving the Reynolds equation. Nowadays engineers apply the no-slip boundary condition with the most matter of course. But in the 19th century the behaviour of fluids close to the solid wall was discussed by personalities as Stokes, Poisson, Maxwell or Navier. Navier [1] e.g. introduced a slippage factor in his derivation of the Navier-Stokes equations.

In the middle of the 19th century Stokes was commissioned by the Royal Society, to discuss the issue regarding the slipping behaviour of fluids close to solid walls. And he concluded in [2] & [3] that the effect of slippage on solid walls, if it exists, was up to his time too small to measure and could be neglected. Hence for sufficiently large flow geometries the effect of wall sliding was neglected. Even today measuring the slip velocity close to solid walls is a challenging task and no general approach has figured out. This conclusion yields up to now and is sometimes treated like a principle. But in the case of sealing systems where commonly gaps are in the order of some microns and below the effect of wall slippage has to be taken into account. Experimental investigations of sealing manufacturers show that the leakage behav- iour of geometrically identical sealing systems depends on the material paring and hence on the surface energy. As a cause for the discrepancy between calculations and experimental investigations a breakdown of the no slip boundary condition is suspected.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-208982
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 Apr 2022 12:42
Last Modified: 27 Mar 2023 13:58
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20898
PPN: 495503908
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