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Rheological and Wetting Properties of Environmentally Acceptable Lubricants (EALs) for Application in Stern Tube Seals

Surface Technology and Tribology, University of Twente, 7522NB Enschede, The Netherlands
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Lubricants 2018, 6(4), 100; https://doi.org/10.3390/lubricants6040100
Received: 3 July 2018 / Revised: 23 October 2018 / Accepted: 8 November 2018 / Published: 13 November 2018
(This article belongs to the Special Issue Fluid-Film Lubrication)
The use of Environmentally Acceptable Lubricants (EALs) for stern tube lubrication is increasing. Although the machine components of a sailing vessel are designed to operate together with mineral oil-based lubricants, these are being replaced by the less environmentally harmful EALs. Little is known about the rheological performance of EALs in particular at the high shear rates that occur in stern tube seals. In this study, the viscosity and wetting properties of a set of different EALs is analysed and compared to traditional mineral oil-based lubricants using a set of experimental techniques. Some of the EALs present Newtonian behavior whereas other show shear thinning. No significant difference in surface tension was observed between the different lubricants. View Full-Text
Keywords: lubricant; marine; rheology; Environmentally Acceptable Lubricants (EAL); stern tube; environmental; shear thinning lubricant; marine; rheology; Environmentally Acceptable Lubricants (EAL); stern tube; environmental; shear thinning
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Borras, F.X.; De Rooij, M.B.; Schipper, D.J. Rheological and Wetting Properties of Environmentally Acceptable Lubricants (EALs) for Application in Stern Tube Seals. Lubricants 2018, 6, 100.

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