Morton M. Denn's Polymer melt processing : foundations in fluid mechanics and PDF

By Morton M. Denn

Lots of the shaping within the manufacture of polymeric gadgets is performed within the soften kingdom, because it is a considerable a part of the actual estate improvement. soften processing comprises an interaction among fluid mechanics and warmth move in rheologically complicated beverages, and brought as an entire it's a great instance of the significance of coupled shipping methods. This ebook is at the underlying foundations of polymer soften processing, that are derived from really elementary rules in fluid mechanics and warmth move; the extent is that of a complicated undergraduate or starting graduate path, and the fabric can function the textual content for a path in polymer processing or for a moment path in delivery processes
Polymer processing -- basics -- Extrusion -- Temperature and strain results in movement -- the skinny hole approximation -- Quasi-steady research of mildew filling -- Fiber spinning -- Numerical simulation -- Polymer soften rheology -- Viscoelasticity in processing flows -- balance and sensitivity -- Wall slip and extrusion instabilities -- based fluids -- blending and dispersion

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Extra info for Polymer melt processing : foundations in fluid mechanics and heat transfer

Example text

7. Data are typically plotted on log–log coordinates, and, as noted in Chapter 1, two features are commonly observed: There is an approach to a region of constant viscosity at low shear rates (denoted ηo , the zero-shear viscosity), and there is a region of power-law behavior (a straight line on a logarithmic plot) at intermediate shear rates. There may also be a region of constant viscosity at high shear rates, but this region is rarely observed experimentally. Because the viscosity functions of polymer melts decrease with increasing shear rate, melts are often referred to as shear thinning.

Denn, J. , 114, 185 (2003). 1, is central to most melt processing operations. We can achieve considerable insight into the operation and design of single-screw extruders by remarkably simple models, despite the mechanical complexity. We begin this chapter by obtaining velocity, stress, and temperature distributions for flow in straight channels with parallel walls of “infinite” length. The infinite channel results are important in and of themselves, but we shall see here that they lead immediately to a model for the single-screw extruder as well.

7. Data are typically plotted on log–log coordinates, and, as noted in Chapter 1, two features are commonly observed: There is an approach to a region of constant viscosity at low shear rates (denoted ηo , the zero-shear viscosity), and there is a region of power-law behavior (a straight line on a logarithmic plot) at intermediate shear rates. There may also be a region of constant viscosity at high shear rates, but this region is rarely observed experimentally. Because the viscosity functions of polymer melts decrease with increasing shear rate, melts are often referred to as shear thinning.

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