Journal ArticleDOI
The rheological characterization of HPG gels: Measurement of slip velocities in capillary tubes
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Measurements are reported for the properties of two hydroxypropyl guar (HPG) gels that are composed of three distinct regions: a yield value at low stress levels, a quasi-linear region at intermediate stress or deformation rate levels, and a broad region in which the flow is entirely dominated by slip phenomena.Abstract:
Measurements are reported for the properties of two hydroxypropyl guar (HPG) gels. The flow curves are composed of three distinct regions: a yield value at low stress levels, a quasi-linear region at intermediate stress or deformation rate levels, and a broad region at high deformation rate levels in which the flow is entirely dominated by slip phenomena.read more
Citations
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Apparent slip and viscoplasticity of concentrated suspensions
TL;DR: In this paper, the apparent slip flows of incompressible and viscoplastic (Herschel-Bulkley) fluids in plane Couette, capillary, and rectangular slit dies under fully developed, isothermal, and creeping flow conditions were analyzed under the assumption that apparent slip layer consists solely of the binder and its thickness is independent of the flow rate.
Journal ArticleDOI
Slip mechanisms in complex fluid flows
TL;DR: The classical no-slip boundary condition of fluid mechanics is not always a valid assumption for the flow of several classes of complex fluids including polymer melts, their blends, polymer solutions, microgels, glasses, suspensions and pastes, and the occurrence of slip complicates the analysis of rheological data.
Journal ArticleDOI
Shear viscosity and wall slip behavior of a viscoplastic hydrogel
TL;DR: In this paper, the apparent slip and viscoplastic behavior of a hydrogel consisting of 0.2 w. % aqueous solution of poly(acrylic acid) was analyzed employing steady torsional and circular tube (capillary) flows.
Journal ArticleDOI
Mat formation and unstable flows of highly filled suspensions in capillaries and continuous processors
TL;DR: In this article, the authors investigated the capillary flow and extrusion of highly filled suspensions of ammonium sulfate and other salt fillers in a poly(butadiene acrylonitrile acrylic acid), PBAN matrix.
Journal ArticleDOI
Cessation of viscoplastic Poiseuille flow with wall slip
TL;DR: In this paper, the Papanastasiou regularization of the constitutive equation is employed to solve the axisymmetric Poiseuille flow of a Herschel-Bulkley fluid under the assumption that slip occurs along the wall.
References
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Journal ArticleDOI
Explicit Formulas for Slip and Fluidity
TL;DR: In this paper, the authors present a method for finding a fluidity function leading to an efflux formula which agrees satisfactorily with the data, after which the corresponding efflux function is obtained by an integration.
Journal ArticleDOI
End Corrections in the Capillary Flow of Polyethylene
TL;DR: In this article, the end correction term of polyethylene was determined as a function of the shear rate of the extruded filament, and it was shown that at high shear rates there is an abrupt decrease in dn/d log Gn.
Journal ArticleDOI
Apparent Slip Flow of Polymer Solutions
Yoram Cohen,Arthur B. Metzner +1 more
TL;DR: In this paper, the flow behavior of aqueous and organic polymer solutions in laminar flow was studied experimentally in small-diameter tubes and the experimental flow rates were abnormally higher than the predictions based on viscometric cone and plate data.
Journal ArticleDOI
Overview of Current Hydraulic Fracturing Design and Treatment Technology--Part 1
TL;DR: In this paper, the authors focus on fractures that are oriented more or less in the vertical plane, and propagate outward in opposite directions from a wellbore (e.g. vertical fractures).
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