Titlebook: Rheological Measurement; A. A. Collyer,D. W. Clegg Book 1993 Springer Science+Business Media Dordrecht 1993 computer.control.flow.flows.fl

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Capillary Rheometry,tively simple in that, if a steady viscometric flow is assumed within the constant circular section tubing, it is generally very easy to derive equations from elementary constitutive equations which yield the velocity profile and pressure drop within the pipe. We shall discover that for polymer melt

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Slit Rheometry,the die as a function of flow rate. Wall shear stress is calculated from the pressure gradient and shear rate from the volumetric flow rate. Finally, the viscosity is determined by the ratio of shear stress to shear rate.

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Converging Dies,ribe it, the same is not yet true of flow in convergences where the extensional strain rate becomes significant compared to the wall shearrate. Various methods of describing the convergent flow behaviour of polymeric liquids in dies and in other regimes have formed the basis of recent reviews. (see

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Recoverable Elastic Strain and Swelling Ratio,essed condition. Thus one sees a general elastic recovery. The term ‘recoverable strain’ is usually used more restrictively. Suppose a sample is undergoing a steady shear flow at shear rate. γ, where the first normal stress difference is N. and the shear stress is σ. If the shear stress is annihilat

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Computer Control and Data Processing in Extrusion Rheometers,chnology to enhance the efficiency and effectiveness of extrusion rheometers. We shall not deal in depth with those modern extrusion rheometers which are fully instrumented, since they are described elsewhere in this volume. However, users of these instruments may find our observations to be of valu

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