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Slip length in narrow sealing gaps – an experimental approach

Corneli, Tobias ; Pelz, Peter F. ; Ludwig, Gerhard (2022)
Slip length in narrow sealing gaps – an experimental approach.
18th International Sealing Conference. Stuttgart, Germany (08.10.-09.10.2014)
doi: 10.26083/tuprints-00020896
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: Slip length in narrow sealing gaps – an experimental approach
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2014
Publisher: VDMA Fluidtechnik
Event Title: 18th International Sealing Conference
Event Location: Stuttgart, Germany
Event Dates: 08.10.-09.10.2014
DOI: 10.26083/tuprints-00020896
Origin: Secondary publication service

For narrow sealing gaps in average smaller ca. 1 μm it is expected that the no-slip boundary condition does not yield anymore. As a consequence the friction is reduced and the leakage is increased compared to the no-slip design case. Though the concept of slip length was introduced by Navier and Maxwell already in the 19th century, it is up to now costly to measure the slip length. This is due to the required measurement precision. Today the slip length is measured in laboratories for glass, silicium or sapphire wafers while using fluorescence methods to determine the flow velocity and is thus far from sealing applications. The present paper introduces an alternative method to measure the slip length for typical materials that are used in sealing technologies. A key advantage of the presented method is that the slip length can be evaluated while measuring the physical quantities torque and gap setting.

Within the paper the design of the apparatus including the measurement equipment is discussed in detail.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-208964
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 12:38
Last Modified: 27 Mar 2023 13:40
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20896
PPN: 495503886
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