Journal Article10.1080/00986449308936153
Extrusion and lubrication flows of viscoplastic fluids with wall slip
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TL;DR: In this article, an analytical model of the generalized plane Couette flow of viscoplastic fluids was developed, which can be realistically represented with the Herschel-Bulkley constitutive equation, which was used as the basis for the development of the analytical model.
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Abstract: The simplest model flow which approximates the extrusion (shallow screw channels) and lubrication flow is the steady, laminar flow occurring between two infinitely long parallel plates i.e., the generalized plane Couette flow. Here we develop an analytical model of the generalized plane Couette flow of viscoplastic fluids. The deformation and flow behavior of viscoplastic fluids can be realistically represented with the Herschel-Bulkley constitutive equation, which we have utilized as the basis for the development of our analytical model. Furthermore, as also demonstrated here, the deformation behavior of viscoplastic fluids is generally complicated by the presence of wall slip at solid walls, which occurs as a function of the wall shear stress. The wall slip versus the wall shear stress behavior of viscoplastic fluids can be experimentally characterized using viscomelric flows, including steady torsional and capillary flows. Thus determined Navier's wall slip coefficient can then be utilized in ...
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Citations
Estimation of the parameters of Herschel-Bulkley fluid under wall slip using a combination of capillary and squeeze flow viscometers
Hansong Tang,Dilhan M. Kalyon +1 more
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Fundamentals of Global Modeling for Polymer Extrusion
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Mathematical Modeling and Experimental Studies of Twin-Screw Extrusion of Filled Polymers
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Modeling of Twin Screw Extrusion of Polymeric Materials
TL;DR: In this article , a global approach to process modeling of twin-screw extrusion is presented which includes solid polymer transport, polymer plasticating, and the flow of molten polymer. And finally, the future prospects of developments and research of twin screw extrusion are discussed.
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Wall Slip and Extrudate Distortion in Linear Low‐Density Polyethylene
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Yoram Cohen,Arthur B. Metzner +1 more
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