On the use of flow through a contraction in estimating the extensional viscosity of mobile polymer solutions

Binding, D.M.; Walters, K.

doi:10.1016/0377-0257(88)85026-2

Cited by 131 publications

(75 citation statements)

References 6 publications

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“…Flow through a constriction, or contraction-expansion flow, is a benchmark used to establish and test rheological models of complex fluid flows such as polymer solutions [1], since it requires the fluid to submit to both shear and extensional strains. In particular, such a flow geometry allows careful comparison of the predictions of models with controlled laboratory experiments.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional constriction flows of foams

Jones

Dollet

Slosse

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The flow of a quasi-two-dimensional foam through a constriction is described. The bubble velocity and elongation (texture) is compared between two sets of experiments and two different quasi-static simulations using Surface Evolver and Potts Model. The simulations capture the effect of changing the degree of rounding of the corners of the flow geometry and the length of the constricted region. Validation of these simulation methods offers the possibility to easily vary many parameters of interest and to explore parameter ranges that are inaccessible to experiments such as low liquid fraction and slow velocity. Perspectives include characterisations of a 3D flow at the bubble scale.

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Section: Introductionmentioning

confidence: 99%

Two-dimensional constriction flows of foams

Jones

Dollet

Slosse

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Careful consideration must be given to the shape of the contraction in order to realize the desired extensional deformation. Many of the earliest studies with converging geometries utilized abrupt or constant-angle, tapered macroscale contractions (Cogswell (1978); Binding & Walters (1988)). The hyperbolically-shaped contraction is unique in that it can be used to impose a nominally constant extension rate along its centerline for a given volumetric flow rate, as discussed by James (1991).…”

Section: Introductionmentioning

confidence: 99%

Microfluidic extensional rheometry using a hyperbolic contraction geometry

et al. 2013

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Microfluidic devices are ideally suited for the study of complex fluids undergoing large deformation rates in the absence of inertial complications. In particular, a microfluidic contraction geometry can be utilized to characterize the material response of complex fluids in an extensionally-dominated flow, but the mixed nature of the flow kinematics makes quantitative measurements of material functions such as the true extensional viscosity challenging. In this paper, we introduce the 'extensional viscometer-rheometer-on-a-chip' (EVROC), which is a hyperbolically-shaped contractionexpansion geometry fabricated using microfluidic technology for characterizing the importance of viscoelastic effects in an extensionally-dominated flow at large extension rates (λε a 1, where λ is the characteristic relaxation time, or for many industrial processesε a 1 s −1 ). We combine measurements of the flow kinematics, the mechanical pressure drop across the contraction and spatially-resolved flow-induced birefringence, to study a number of model rheological fluids as well as several representative liquid consumer products in

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“…There has been work on lubricated converging channel flows [56], which does not seem to have developed as a widely used technique, and on unlubricated converging channel flows [57]. Measurements on converging and contraction flows are used to estimate some sort of extensional viscosity for polymeric liquids, generally on the assumption that extensional stresses far exceed shear stresses [58,59] (see also [3,Section 4]). …”

Section: Introductionmentioning

confidence: 99%

One hundred years of extensional flow

Petrie

2006

Journal of Non-Newtonian Fluid Mechanics

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This historical review takes a few selected issues from the rheological studies of extensional flow that fill the literature, starting with extracts from the seminal papers of Trouton (Proc. Roy. Soc. A77 (1906) 426-440) and Fano (Archivio di fisiologio, 5 (1908) 365-370). Work in the first half of the twentieth century on spinnability and extensional viscosity measurement is highlighted, followed by a discussion of the blossoming of studies on extensional flow. As a case study, a project on anti-misting additives in aviation fuel is taken; whether the rheology or the politics is the more interesting is an open question. Finally some current issues surrounding spinnability and other extensional flow phenomena are discussed.

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On the use of flow through a contraction in estimating the extensional viscosity of mobile polymer solutions

Cited by 131 publications

References 6 publications

Two-dimensional constriction flows of foams

Two-dimensional constriction flows of foams

Microfluidic extensional rheometry using a hyperbolic contraction geometry

One hundred years of extensional flow

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