Free-Surface Flow of Lubricating Greases
2016 (English)Conference paper, Presentation (Refereed)
Grease lubrication is traditionally used in a great variety of mechanicalsystems such as rolling bearings, seals, and gears where it has beenshown more advantageous than oil, mainly due to its consistencyallowing the grease to stay inside the system and not leak out. Freesurface effects play an important role in rolling bearings and opengears as the configuration normally is filled with about 30% grease toavoid heavy churning. In this study an analytical model of thestationary uniform flow on a rotating disc is developed and validatedwith experiments. The model results in the velocity profile for the flowin the thin fully yielded viscous layer in connection to the surface aswell as an expression for the plug flow region on top of the viscouslayer. Experiments with two different greases having NLGI grade 1 and2 respectively shows it is possible to obtain a good fit with theanalytically obtained thickness using the rheological parameters foractual greases.
Place, publisher, year, edition, pages
Research subject Fluid Mechanics; Machine Elements
IdentifiersURN: urn:nbn:se:ltu:diva-34367Local ID: 88a90512-6d63-4b60-9022-f0ea3070e1baOAI: oai:DiVA.org:ltu-34367DiVA: diva2:1007617
STLE Annual Meeting & Exhibition : 15/05/2016 - 19/05/2016
Godkänd; 2016; 20160825 (andbra)2016-09-302016-09-30Bibliographically approved