Comparison of Non-Newtonian Constitutive Laws in Hydrodynamic Lubrication

Boucherit, Hamid; Lahmar, Mustapha; Bou‐Saïd, Benyebka; Tichy, John

doi:10.1007/s11249-010-9591-7

Cited by 8 publications

(12 citation statements)

References 22 publications

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“…Using macroscopic techniques to study surfaces activities is important to narrow the gap between macro and nanoscales, and develop viscoelastic models can be a fit to real data. 35 Future work will consider investigating the behaviors of fatty acids individually. Also, we will aim to optimize performance and develop new bio-based lubricants.…”

Section: Discussionmentioning

confidence: 99%

Utilizing macroscopic rheometry to investigate triglyceride self-assembly

Elemsimit

Grecov

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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The rheological behavior of a canola oil-based bio-lubricant was correlated with its surface activities using a rotary rheometer. The experiments on the gap size, substrate, and surface conditions led to a consistent and conceivable assumption that the self-assembled monolayer was extended to a degree that was sufficient to make a significant change in the bulk properties. In parallel, the thermal behavior was also connected to the surface activities. Differential scanning calorimetry was used to measure what is thought to be the monolayer melting point without using a graphite substrate. Crystallization points were measured at relatively high temperatures. Tribological tests were conducted and explained based on the rheological and thermal findings. A scenario describing both the boundary and bulk regimes was hypothesized. Rheometry and thermal analysis techniques are promising because of the variety of variables that could be controlled, such as temperature, shear, time, gap and substrate. To the best of our knowledge, this is the first study using macroscopic rheology to study the surfactant activities of vegetable oil. The influence of substrate and gap size on rheological behavior could change the current standards for using rotary rheometers.

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Section: Discussionmentioning

confidence: 99%

Utilizing macroscopic rheometry to investigate triglyceride self-assembly

Elemsimit

Grecov

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Mathematical viscoelastic models have not been able to provide quantifiable authentic simulations approaching the true behavior of hydrodynamic lubrication. 1 This lack of effective simulations could be a result of inadequate experimental rheological characterization of liquid lubricants. The extreme conditions associated with lubrication applications, such as very high shear rates, very high pressures and very narrow gaps, make such measurements difficult.…”

Section: Introductionmentioning

confidence: 99%

“…The extreme conditions associated with lubrication applications, such as very high shear rates, very high pressures and very narrow gaps, make such measurements difficult. The mathematical models used to simulate lubricant systems, such as Maxwell models and the Oldroyd-B and Phan-Tien and Tanner (PTT) models by Boucherit et al and Gwynllyw and Phillips, [1][2][3] were not developed specifically for lubrication. Oil lubricants can be considered as Newtonian fluids for applications such as pumping and piping because their overall non-Newtonian behavior is not apparent in these situations, which makes rheological studies on oils less attractive.…”

Section: Introductionmentioning

confidence: 99%

Non-Newtonian behavior in canola-oil-based bio-hydraulic oil

Elemsimit

Grecov

2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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The use of vegetable oils can offer important environmental advantages with respect to biodegradability and renewability, along with good performance in a range of different applications. Unlike petroleum-based lubricants, which have been studied and developed over a century, knowledge related to vegetable-oil-based lubricants is limited. In this work, the rheological properties of industrial canola-oil-based bio-lubricants were investigated using a rotary rheometer. The bio-hydraulic oil exhibited constant viscosity at both moderate and high shear rates, as well as shear thinning at low shear rates and temperatures less than 30 ℃. Frequency sweep tests revealed significant viscoelasticity in the bio-hydraulic oil, which developed over time. Time dependence and structure recovery effects were also investigated. These experiments reveal some characteristic liquid crystal fingerprints. To the best of our knowledge, this study is the most extended rheological characterization of low-viscosity vegetable-oil-based lubricants.

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“…Many authors have investigated the non-Newtonian effects of fluids based upon various rheological models in lubrication [1]. In most of them, the main keypoint relies on the choice of the relationship between the effective viscosity η eff and the shear rateγ (or the effective viscosity η eff and the shear stress τ).…”

Section: Introductionmentioning

confidence: 99%

“…Coordinates on the shearing surface (dimensionless) z ⋆ (z) Orthogonal coordinate (dimensionless) D(U) = 1 2 ∇U + T (∇U) Symmetric parts of the velocity gradient W (U) = 1 2 ∇U − T (∇U) Skew-symmetric parts of the velocity gradienṫ γ (α,β) Shear rate (dimensionless 1D -for long devices-or 2D) η 1 , η 2 , η el. , η visc.…”

mentioning

confidence: 99%

From the Phan–Thien–Tanner/Oldroyd-B Non-Newtonian Model to the Double Shear Thining Rabinowisch Thin Film Model

Bayada

Chupin

2011

Journal of Tribology

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In this paper, an asymptotic expansion is used to derive a description of Phan–Tien– Tanner (PTT)/Oldroyd-B flows in the thin film situation without the classical “upper convective maxwell”(UCM) assumption. We begin with a short presentation of the Phan–Thien–Tanner/Oldroyd-B models, which introduce viscoelastic effects in a solute–solvent mixture. The three-dimensional flow is described using five parameters, namely the Deborah number (De) (or the relaxation parameter λ), the viscosity ratio r, the bulk fluid viscosity η, the material slip parameter a related to the “convected derivative” and an elongation number κ. Then we focus on the thin film assumption and the related asymptotic analysis that allows us to derive a reduced model. A perturbation procedure for “not too small” values of κ allows us to obtain further results such as an asymptotic “effective viscosity/ shear rate” law, which appears to be a perturbation of the double Rabinowisch model, whose parameters are completely defined by those of the original three-dimensional model. And last a numerical procedure is proposed based on a penalized Uzawa method, to compute the corresponding solution. This algorithm can also be used for any generalized double Newtonian shear thinning Carreau law.

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Comparison of Non-Newtonian Constitutive Laws in Hydrodynamic Lubrication

Abstract: International audienc

Cited by 8 publications

References 22 publications

Utilizing macroscopic rheometry to investigate triglyceride self-assembly

Utilizing macroscopic rheometry to investigate triglyceride self-assembly

Non-Newtonian behavior in canola-oil-based bio-hydraulic oil

From the Phan–Thien–Tanner/Oldroyd-B Non-Newtonian Model to the Double Shear Thining Rabinowisch Thin Film Model

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