The SKF University Technological Centre for Grease Lubrication at the University of Twente has an opening for a PhD candidate. The goal of this 4-year project is to refine base oil specifications for lubricating greases using methods and principles from fluid mechanics, rheology, complex fluids, thermodynamics and tribology. This will require a thorough understanding of the thin film lubrication properties of oils, which is dictated by their physical and chemical properties. We are looking for base oil properties that engender good lubrication and slow, controlled release of oil. This project is executed in close collaboration with SKF, a leading global bearing manufacturer, and ExxonMobil, a leading global base stock and lubricant manufacturer.
Lubricating grease is a visco-elastic material typically composed of a 5-15% of a thickener matrix, 80-94% base oil (mineral or synthetic) and 1-5% of various additives. The efficiency of grease base oil is a significant factor in bearing performance and durability. The end of grease life in a roller bearing is the point at which the grease can no longer build up a sufficiently thick film to fully separate the contacting surfaces in the bearing. The feed mechanism of oil to the contacts is oil separation, also called “bleed”. An ideal grease would bleed at a constant rate just high enough to provide an oil flow that will yield a film thick enough to lubricate the contacts. Too much bleed will “exhaust” the grease, too little will cause early bearing seizure. Grease bleed is very delicate. It is the result of the grease permeability, the base oil viscosity and the affinity of the base oil to the thickener material. In addition to showing controlled bleed, a good oil should also have excellent “minimum lubrication” properties: it should have properties such that a single drop of oil will lubricate for a very long time. The challenge here includes finding the ideal grease base oil and establishing a consistent methodology for evaluating base oil efficiency.
You will :
For more information, please contact Dr. Jude A. Osara, PE (email@example.com) or Prof.dr.ir. Piet M. Lugt (firstname.lastname@example.org).
We invite applications from candidates, who recently graduated or expect to graduate soon. Your application should be submitted before 27th June, 2021.
Please send the following documents through the link “Apply now” below:
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University of Twente (UT)
University of Twente (UT) has entered the new decade with an ambitious, new vision, mission and strategy. As ‘the ultimate people-first university of technology' we are rapidly expanding on our High Tech Human Touch philosophy and the unique role it affords us in society. Everything we do is aimed at maximum impact on people, society and connections through the sustainable utilisation of science and technology. We want to contribute to the development of a fair, digital and sustainable society through our open, inclusive and entrepreneurial attitude. This attitude permeates everything we do and is present in every one of UT's departments and faculties. Building on our rich legacy in merging technical and social sciences, we focus on five distinguishing research domains: Improving healthcare by personalised technologies; Creating intelligent manufacturing systems; Shaping our world with smart materials; Engineering our digital society; and Engineering for a resilient world.
As an employer, University of Twente offers jobs that matter. We equip you as a staff member to shape new opportunities both for yourself and for our society. With us, you will be part of a leading tech university that is changing our world for the better. We offer an open, inclusive and entrepreneurial climate, in which we encourage you to make healthy choices, for example, with our flexible, customisable conditions.Mehr
|Titel||PhD Position: "Base Oil Efficiency in Grease Lubricated Bearings"|
|Employer||University of Twente|
|Job location||Drienerlolaan 5, 7522 NB Enschede|
|Veröffentlicht||April 28, 2021|
|Bewerbungsschluss||Juni 27, 2021|
|Jobart||PhD/ Doktorand/in  |
|Fachbereiche||Thermodynamik,   Chemieingenieurwesen,   Physikingenieurswesen,   Strömungsphysik,   Maschinenbau,   Strömungsmechanik  |