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Slip length of the tribo system steel-polyalphaolefin-steel determined by a novel tribometer

Corneli, Tobias ; Ludwig, G. ; Pelz, Peter F. (2022)
Slip length of the tribo system steel-polyalphaolefin-steel determined by a novel tribometer.
10th International Fluid Power Conference. Dresden, Germany (08.-10.03.2016)
doi: 10.26083/tuprints-00021191
Conference or Workshop Item, Secondary publication, Publisher's Version

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Abstract

Nowadays sealing systems are commonly designed by means of hydrodynamic and elastohydrodynamic theories. Although the analytical as well as the computational approaches have improved in meaning full manner since the last decades: For small sealing gaps, in the order of micrometers and below, a discrepancy between experimental investigated and theoretically predicted leakage flows occur. As a cause for the discrepancy a breakdown of the no slip boundary condition is suspected. Since in small sealing gaps the continuum hypothesis is violated and molecular effects have to be considered. One fundamental quantity to take molecular affects into account is the slip length. Within this paper a new measurement apparatus to evaluate the slip length for hydraulic applications is presented. The adjustable gaps between two planar surfaces are in the order of magnitude of 1 μm. In a first step the slip length for the system steel-oil –steel is investigated at three different temperatures: 18°C, 22°C and 25°C. The measured slip lengths are in the order of magnitude of ~100 nm.

Item Type: Conference or Workshop Item
Erschienen: 2022
Creators: Corneli, Tobias ; Ludwig, G. ; Pelz, Peter F.
Type of entry: Secondary publication
Title: Slip length of the tribo system steel-polyalphaolefin-steel determined by a novel tribometer
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2016
Publisher: Dresdner Verein zur Förderung der Fluidtechnik e. V., Dresden
Book Title: 10th International Fluid Power Conference (10. IFK) : March 8-10, 2016 in Dresden ; volume 1
Event Title: 10th International Fluid Power Conference
Event Location: Dresden, Germany
Event Dates: 08.-10.03.2016
DOI: 10.26083/tuprints-00021191
URL / URN: https://tuprints.ulb.tu-darmstadt.de/21191
Corresponding Links:
Origin: Secondary publication service
Abstract:

Nowadays sealing systems are commonly designed by means of hydrodynamic and elastohydrodynamic theories. Although the analytical as well as the computational approaches have improved in meaning full manner since the last decades: For small sealing gaps, in the order of micrometers and below, a discrepancy between experimental investigated and theoretically predicted leakage flows occur. As a cause for the discrepancy a breakdown of the no slip boundary condition is suspected. Since in small sealing gaps the continuum hypothesis is violated and molecular effects have to be considered. One fundamental quantity to take molecular affects into account is the slip length. Within this paper a new measurement apparatus to evaluate the slip length for hydraulic applications is presented. The adjustable gaps between two planar surfaces are in the order of magnitude of 1 μm. In a first step the slip length for the system steel-oil –steel is investigated at three different temperatures: 18°C, 22°C and 25°C. The measured slip lengths are in the order of magnitude of ~100 nm.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-211917
Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Fluid Systems (FST) (since 01.10.2006)
Date Deposited: 09 May 2022 11:31
Last Modified: 10 May 2022 05:21
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