Squeeze flow of a power-law fluid between non-parallel plates

Sherwood, J.D.

doi:10.1016/j.jnnfm.2010.12.007

Cited by 17 publications

(15 citation statements)

References 19 publications

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“…5 One can also consider the flow under a constant applied force rather than plate translation velocity or, for rheological measurements, a constant sample mass vs. constant contact area with the plates. The more practically relevant situation of the squeeze flow of a non-Newtonian fluid (e.g., power-law, 6 viscoplastic, yield stress fluids, 2 etc.)…”

Section: Introductionmentioning

confidence: 99%

Squeeze flow of a Carreau fluid during sphere impact

2012

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Articles you may be interested inWe present results from a combined numerical and experimental investigation into the squeeze flow induced when a solid sphere impacts onto a thin, ultra-viscous film of non-Newtonian fluid. We examine both the sphere motion through the liquid as well as the fluid flow field in the region directly beneath the sphere during approach to a solid plate. In the experiments we use silicone oil as the model fluid, which is welldescribed by the Carreau model. We use high-speed imaging and particle tracking to achieve flow visualisation within the film itself and derive the corresponding velocity fields. We show that the radial velocity either diverges as the gap between the sphere and the wall diminishes (Z tip → 0) or that it reaches a maximum value and then decays rapidly to zero as the sphere comes to rest at a non-zero distance (Z tip = Z min ) away from the wall. The horizontal shear rate is calculated and is responsible for significant viscosity reduction during the approach of the sphere. Our model of this flow, based on lubrication theory, is solved numerically and compared to experimental trials. We show that our model is able to correctly describe the physical features of the flow observed in the experiments. C 2012 American Institute of Physics. [http://dx

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Section: Introductionmentioning

confidence: 99%

Squeeze flow of a Carreau fluid during sphere impact

2012

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“…The minimum gap height used in these studies is h = 400µm, which represents the distance between the two nearest points on the bounding plates. All models in this work assume parallel surfaces; a detailed analysis of higher order effects due to non-parallel plates can be found, for example, in [32] for power-law fluids.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Controllable adhesion using field-activated fluids

et al. 2011

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We demonstrate that field-responsive magnetorheological (MR) fluids can be used for variablestrength controllable adhesion. The adhesive performance is measured experimentally in tensile tests (a.k.a. probe-tack experiments) in which the magnetic field is provided by a cylindrical permanent magnet. Increasing the magnetic field strength induces higher peak adhesive forces. We hypothesize that the adhesion mechanism arises from the shear resistance of a yield stress fluid in a thin gap. This hypothesis is supported by comparing the experimentally measured adhesive performance to the response predicted by a lubrication model for a non-Newtonian fluid with a field-dependent yield stress. The model predictions are in agreement with experimental data up to moderate field strengths. Above a critical magnetic field strength the model over-predicts the experimentally measured values indicating non-ideal conditions such as local fluid dewetting from the surface.

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“…However, in the evolution of modern engineering, the role of non-Newtonian squeeze-flow is vital. Numerous scholars have analysed the squeezing flow problem with various non-Newtonian fluid models [19][20][21][22][23][24][25]. Amongst of these non-Newtonian models, couple stress fluid model proposed by Stoke's [26] has been given considerable attention by various investigators in field of fluid mechanics.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetite nanoparticles on couple stress fluid between two parallel squeezing and expanding surfaces

2020

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This article investigates the analysis of hydromagnetic flow of a couple stress fluid through two parallel squeezing surfaces where magnetite nanoparticles are suspended in it. Here ethylene glycol is considered as the base fluid. The dissipations due to magnetic field, viscous and couple stress fluid are considered in the energy equation. The modelled governing differential equations are transformed into dimensionless form of nonlinear coupled ordinary differential equations with the aid of similarity transformations. A shooting method with Runge-Kutta 4th order is utilized to solve the system of reduced flow field equations. The influence of various parameters on the velocity (axial and radial) components and temperature are studied for squeezing and expanding cases for distinct physical parameter through graphs. The results indicate that the axial velocity and temperature show increasing trend for augmenti values of couple stress fluid parameter. Further, radial velocity and temperature also depict augmenting trend for all increasing values of Hartmann number.

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Squeeze flow of a power-law fluid between non-parallel plates

Cited by 17 publications

References 19 publications

Squeeze flow of a Carreau fluid during sphere impact

Squeeze flow of a Carreau fluid during sphere impact

Controllable adhesion using field-activated fluids

Effect of magnetite nanoparticles on couple stress fluid between two parallel squeezing and expanding surfaces

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