Time‐dependent shear flow of artificial slurries in coaxial cylinder viscometer with a wide gap

Horie, Michihiko; Pinder, K. L.

doi:10.1002/cjce.5450570201

Cited by 23 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fibre physical properties are expected to affect the network yield stress. Past work has shown that the yield is proportional to the elastic modulus of the fibres (Thalen and Wahren, 1964b;Bergman and Takamura, 1965) and increases with the aspect ratio of the fibres (Horie and Pinder, 1979;Kitano and Kataoka, 1981). The total strength of a fibre network will be due to contributions from a number of cohesive forces: colloidal, mechanical surface linkage, elastic fibre bending and surface tension (Kerekes et al, 1985).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The yield stress of fibre suspensions

1990

View full text Add to dashboard Cite

Yield stresses were determined for commercial wood pulp suspensions and synthetic fibre suspensions of low and medium mass concentration. The yield stresses measured represent interfibre failure of the network rather than failure between the suspension and a solid surface. The measurements were carried out in a rotary viscometer at low yield stresses and in a concentric rotary shear tester at yield stresses in excess of 2500 Pa. The experimental results were correlated with the volumetric concentration Cv in equations of the form τy = aCbv where a and b are constant for a given fibre type. It was found that b ≃ 3, in agreement with the predictions of a theoretical model of fibre network strength based upon the interlocking of elastically bent fibres. The dependence of the yield stress on the fibre properties of aspect ratio and modulus of elasticity was not adequately predicted by the model, suggesting that fibre bending alone did not account for the network strength over the concentration range studied.

show abstract

Section: Resultsmentioning

confidence: 99%

“…For example Horie and Pinder (1979). report determining Yield stress versus fibre mass concentration for the pulp fibre suspensions.…”

mentioning

confidence: 99%

The yield stress of fibre suspensions

1990

View full text Add to dashboard Cite

show abstract

“…The mold cavity shown in 6 and the advancing melt front (4). The prescribed conditions at these boundaries are (see Fig.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Unsteady flow of dilute fiber suspensions using a Generalized Eulerian Lagrangian approach

Alexanurou

Aiimed

1994

Polymer Composites

View full text Add to dashboard Cite

In recent years the emphasis on the development of fiber reinforced plastics has experienced an unprecedented expansion. One of the most commonly used methods in manufacturing of plastic products is injection molding. In this work we are using a Generalized Eulerian Lagrangian (GEL) formulation to study the unsteady flow of dilute fiber suspensions in injection molding. This formulation combines the advantages of both formulations: in the same flow problem but different regions the GEL formulation allows the selective application of an Eulerian, Lagrangian or a mixture of the two formulations. The suspending fluid is considered to be Newtonian and the contribution of the fibers to the local stress tensor is obtained using a volume averaging theory. The fiber distribution tensor is expressed in terms of a second order tensor with a quadratic closure approximation. Results are shown and discussed for the filling of a cavity from a single gate under different process conditions fibers aspect ratio and content.

show abstract

“…The preceding analyses apply only to cases of isolated particles in simple flow fields and do not take in account interactions among particles or fibers which were found to give rise to significant viscoelastic phenomena in semiconcentrated suspensions. These phenomena include transient behavior [lo], yields stresses [11,12], shear thinning. [13,14], and volume fraction dependence [15], in pure shearing flows.…”

Section: Introductionmentioning

confidence: 99%

Isothermal extrusion of non-dilute fiber suspensions

Papanastasiou

Alexandrou

1987

Journal of Non-Newtonian Fluid Mechanics

View full text Add to dashboard Cite

The extrusion of a rod-like fiber suspension is a Newtonian solvent, as a first step to the fast and inexpensive production of composite materials, is investigated. The analysis is carried out by means of an integral constitutive equation for a non-dilute suspension, streamlined finite element for liquid with memory, and Newton iteration of nonlinear integro-differential equations. The predictions show substantial differences between dilute and nondilute fiber suspension regarding the processing conditions (pressure drop, velocity distribution, die-swell) and the resulting fiber orientation. Nondilute fiber suspensions exhibit substantial shear-thinning and negligible elasticity as evidenced by the small die-swell, and fiber concentration viscosity-thicker&g as evidenced by the large pressure drop. The fiber orientation is computed by solving the orientation distribution function along selected streamlines of the complex velocity field. It is shown that the fiber orientation far downstream can be made independent of the random fiber orientation at the inlet.

show abstract

Time‐dependent shear flow of artificial slurries in coaxial cylinder viscometer with a wide gap

Cited by 23 publications

References 13 publications

The yield stress of fibre suspensions

The yield stress of fibre suspensions

Unsteady flow of dilute fiber suspensions using a Generalized Eulerian Lagrangian approach

Isothermal extrusion of non-dilute fiber suspensions

Contact Info

Product

Resources

About