Can extensional viscosity be measured with opposed-nozzle devices?

Dontula, Prasannarao; Pasquali, Matteo; Scriven, L. E.; Macosko, Christopher W.

doi:10.1007/bf00396329

Cited by 78 publications

(32 citation statements)

References 24 publications

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“…However, severe problems in the quantitative correlation of the material functions determined with the opposed jet device [61] have led to other methods for studying extensional flows.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear shear and extensional flow dynamics of wormlike surfactant solutions

Yeşilata

Clasen

McKinley³

2006

Journal of Non-Newtonian Fluid Mechanics

143

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“…However, severe problems in the quantitative correlation of the material functions determined with the opposed jet device [61] have led to other methods for studying extensional flows.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear shear and extensional flow dynamics of wormlike surfactant solutions

Yeşilata

Clasen

McKinley³

2006

Journal of Non-Newtonian Fluid Mechanics

143

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“…In this study, the relaxation time λ was measured by CaBER. λ of PEO Tr of dilute or semidilute polymer solution can be high 8,26,27) . Therefore, we considered that η ex and Tr obtained in the present study were in reasonable range.…”

Section: Extensional Rate Obtained From Velocity Profilesmentioning

confidence: 99%

“…In contrast with polymer melts, it is difficult to apply stable uniaxial extensional stress to polymer solution. Since the early 1990, several methods to measure extensional properties of the fluids were proposed [5][6][7][8] . The filament stretching extensional rheometer (FiSER) 9) and the capillary breakup extensional rheometer (CaBER) [10][11][12] are the pioneering work of the extensional viscosity measurement of polymer solutions with capillary thinning technique.…”

Section: Introductionmentioning

confidence: 99%

Extensional Viscosity of Low Viscous Polymer Solutions Measured by Pressure Drops in Abrupt Contraction Channels

Hidema

Shiraki

Tanino

et al. 2018

J. Soc. Rheol., Jpn

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Extensional flow properties of dilute viscoelastic solution have attracted much attention for almost three decades. This is because extensional viscosity or relaxation time of viscoelastic solution under extensional stresses add a lot of impact on fluidity of the solution; the phenomenon is related to many industrial applications. Several techniques were proposed and many studies were conducted to measure extensional properties of polymer solutions. However, less studies were reported in the case of non-uniform solution, such as suspensions. In this study, we propose a relatively simple method to measure extensional viscosity. We adopt a syringe-shape abrupt contraction channels for the measurement; the syringe-shape apparatus is useful to contain non-uniform dilute solutions. As a first step to develop the experimental apparatus and method, we tested polymer solutions. Polymers used to prepare sample solutions were polyethylene oxide (PEO), hydroxypropyl cellulose (HPC) and polyacrylic acid (PAA). Each polymer has different flexibility, which cause different characteristics of the extensional viscosity of polymer solutions. Extensional viscosities obtained in this study detected the characteristic of each polymer solution. Extensional viscosities of PEO solution was increased by increasing extensional rates; that of HPC and PAA solution were decreased by increasing extensional rates; the tendency was explained by relaxation times of each polymer solution.

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“…Various technical approaches have been developed for the measurement of this material function and the results compared in order to assess the merits and disadvantages of each approach so that a standard procedure could be selected (Hudson and Jones [29] and the projects S1 and M1). A final answer to this problem is coming out slowly, but it is clear that in the short term, the outcome will not be a method as accurate as that used for the measurement of the viscometric viscosity, as the paper of Dontula et al [30] on the shortcomings of the opposed-jet technique shows.…”

Section: The Elongational 6iscosity Of Drag Reducing Fluidsmentioning

confidence: 99%

A qualitative assessment of the role of a viscosity depending on the third invariant of the rate-of-deformation tensor upon turbulent non-Newtonian flow

Oliveira

Pinho²

1998

Journal of Non-Newtonian Fluid Mechanics

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The numerical simulation of some non-Newtonian effects in wall and wall-free turbulent flows, such as drag reduction in pipe flows or the decrease in transverse normal Reynolds stresses, has been attempted in the past with a limited degree of success on the basis of modified wall functions applied to traditional turbulence models (k -m), rather than through more realistic rheological constitutive equations. In this work, it is qualitatively shown that if the viscosity function of a generalised Newtonian fluid is assumed to depend on the third invariant of the rate of deformation tensor, there is an increase of the viscous diffusion terms, but especially, of the dissipation of turbulence kinetic energy by a factor equal to the Trouton ratio of the fluid, divided by the Trouton ratio of the solvent, thus indicating a possible way to improve rheological-turbulence modelling.

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Can extensional viscosity be measured with opposed-nozzle devices?

Cited by 78 publications

References 24 publications

Nonlinear shear and extensional flow dynamics of wormlike surfactant solutions

Nonlinear shear and extensional flow dynamics of wormlike surfactant solutions

Extensional Viscosity of Low Viscous Polymer Solutions Measured by Pressure Drops in Abrupt Contraction Channels

A qualitative assessment of the role of a viscosity depending on the third invariant of the rate-of-deformation tensor upon turbulent non-Newtonian flow

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