Last application date: Oct 31, 2019 09:33
Department: TW08 - Department of Electrical Energy, Metals, Mechanical Constructions and Systems
Employment category: Doctoral fellow
Contract: Limited duration
Degree: Master of Science in Mechanical, Chemical or Physics Engineering.
Occupancy rate: 100%
Vacancy Type: Research staff
Thermo-Elastohydrodynamic Lubrication (TEHL) is a specific lubrication regime which typically occurs in non-conformal contacts, such as ball bearings, roller bearing, gear teeth,.. and is therefore very relevant in many machine applications. TEHL is characterized by thin lubricant films (50 nm-1 m) in which the hydrodynamic pressure can reach values up to GPa range (1-5 GPa), inducing elastic deformation of the opposing contact surfaces. At such high pressures, the lubricant becomes compressible, and behaves in a highly non-Newtonian way by local solidification and shear-thinning. Accurate and quantitative computational simulation of TEHL (Reynolds, CFD) requires therefore an accurate description of the lubricant’s compressibility and the rheology (i.e. piezo-viscosity and shear thinning) as well as the thermal properties (specific heat, conductivity), wall slip and cavitation. Today, however, mainly empirical constitutive models are applied, which typically involve curve fitting of experimental data, obtained for a particular common lubricant and under specific conditions. Hence, their range of applicability is rarely questioned when applying them to other lubricants, surface materials or operating conditions. Obviously such generalized empiricism does not contribute to the versatility, accuracy and reliability of continuum computational methodologies. In the past decades Molecular Dynamics (MD) has emerged as a more sophisticated computational approach to study interfacial phenomena and thin film rheology. Such computational approach offers the advantage to obtain an accurate estimate of the lubricant’s thermo-mechanical properties, by direct simulation of the lubricants molecular structure subject to different conditions of pressure, temperature, shear etc.. Your job will consist of developing a Multiscale Modelling framework, in which non-equilibrium Molecular Dynamics is exploited to derive appropriate constitutive relations that can be used in continuum simulation techniques i.e. local thermomechanical properties of lubricants, near-wall effects, molecular layering, mechanochemistry etc.
For further information on the project and/or application, please contact Prof. Dieter Fauconnier (email@example.com) or Prof. Toon Verstraelen (firstname.lastname@example.org ).Lue lisää
|Otsikko||PhD Student - Department of Electrical Energy, Metals, Mechanical Constructions and Systems|
|Job location||Sint-Pietersnieuwstraat 33, 9000 Gent|
|Julkaistu||syyskuuta 16, 2019|
|Viimeinen hakupäivä||lokakuuta 31, 2019|
|Tieteenalat||Termodynamiikka,   Kemian tekniikka,   Termokemia,   Teknillinen fysiikka,   Virtausoppi,   Molekyylifysiikka,   Konetekniikka,   Laskennallinen matematiikka,   Virtausmekaniikka,   |