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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Dini, D.
Engineering and Physical Sciences Research Council
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (26/26 displayed)
- 2024Effect of electric fields on the decomposition of phosphate esterscitations
- 2023Non-equilibrium molecular simulations of thin film rupturecitations
- 2023On the importance of Crystal Plasticity Finite Element discretisation for the identification of crack initiation in RCF using energy-based criteriacitations
- 2023Comparing the tribological performance of water-based and oil-based drilling fluids in diamond–rock contactscitations
- 2021Normal load and counter body size influence the initiation of microstructural discontinuities in copper during slidingcitations
- 2021The effect of fluid viscoelasticity in lubricated contacts in the presence of cavitationcitations
- 2021NiO/ZrO2nanocomposites as photocathodes of tandem DSCs with higher photoconversion efficiency with respect to parent single-photoelectrode p-DSCscitations
- 2020Normal load and counter body size influence the initiation of microstructural discontinuities in copper during slidingcitations
- 2020Ab Initio Study of Polytetrafluoroethylene Defluorination for Tribocharging Applicationscitations
- 2020Unraveling and mapping the mechanisms for near-surface microstructure evolution in CuNi alloys under slidingcitations
- 2020Effect of temperature on the deformation behavior of copper nickel alloys under sliding.citations
- 2020An adaptive finite element model for steerable needlescitations
- 2020Substituent effects on the thermal decomposition of phosphate esters on ferrous surfacescitations
- 2019Stability and Dark Hysteresis Correlate in NiO-Based Perovskite Solar Cells
- 2019Stability and Dark Hysteresis Correlate in NiO-Based Perovskite Solar Cellscitations
- 2019Simulating surfactant-iron oxide interfaces: from density functional theory to molecular dynamicscitations
- 2019Investigating the electrodeposition mechanism of anodically grown NiOOH films on transparent conductive oxidescitations
- 2017Tribological properties of PVA/PVP blend hydrogels against articular cartilage.citations
- 2016Oxford HEXameter: laboratory high energy X-ray diffractometer for bulk residual stress analysis
- 2016The Principle of Strain Reconstruction Tomography: Determination of Quench Strain Distribution from Diffraction Measurementscitations
- 2016Comparative assessment of dissipated energy and other fatigue criteriacitations
- 2016Analysis of plastic deformation and residual elastic strain in a titanium alloy using synchrotron x-ray diffractioncitations
- 2016Evaluation and analysis of residual stresses due to foreign object damagecitations
- 2016Diffraction post-processor for polycrystalline plasticity modelling
- 2016Prediction of fatigue crack growth rates in Ti-6Al-4V alloy
- 2015Modelling and experimental characterisation of the rate dependent fracture properties of gelatine gelscitations
Places of action
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article
The effect of fluid viscoelasticity in lubricated contacts in the presence of cavitation
Abstract
In this work we study the influence of fluid viscoelasticity on the performance of lubricated contacts in the presence of cavitation. Several studies of viscoelastic lubricants have been carried out, but none of them have considered the possibility of the presence of cavitation. To describe the effect of viscoelasticity, we use the Oldroyd-B model. By assuming that the product between ϵ, i.e. the ratio between vertical and horizontal length scales, and the Weissenberg number (Wi), i.e. the ratio between polymer relaxation time and flow time scale, is small, we can linearise the viscoelastic thin film equations, following the approach pioneered by "Tichy, J., 1996, Non-Newtonian lubrication with the convected Maxwell model." Consequently, the zeroth-order in ϵWi corresponds to a Reynolds equation modified to describe also the film cavitation through the mass-conserving Elrod-Adams model. We consider the flow of viscoelastic lubricants using: (i) a cosine profile representing a journal bearing unwrapped geometry, and (ii) a pocketed profile to model a textured surface in lubricated contacts. The introduction of viscoelasticity decreases the length of cavitated region in the cosine profile due to the increasing pressure distribution within the film. Consequently, the load carrying capacity increases with Wi by up to 50% in the most favorable condition, confirming the beneficial influence of the polymers in bearings. On the other hand for the pocketed profile, results show that the load can increase or decrease at higher Wi depending on the texture position in the contact. The squeeze flow problem between two plates is also modeled for viscoelastic lubricants considering an oscillating top surface. For this configuration a load reduction is observed with increasing Wi due to the additional time needed to reform the film at high Wi. Furthermore, if viscoelastic effects increase, the cavitation region widens until reaching a value of Wi for which a full-film reformation does not occur after the initial film rupture.