Theoretical and Experimental Investigation of Flow behavior of Nanofield Viscoelastic Fluids in Contraction Flow

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Behrang, Arash | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40666 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Ramazani Saatatabadi, Ahmad
Abstract:
In this work, the viscoelastic fluids flow and their short fiber suspensions has been modeled in contraction geometry using conformation models, these models predict behavior of polymeric chains in contraction geometry. Prediction of viscoelastic fluids flow through a contraction is very important, especially in polymer processing where a polymer melt in barrel of an extruder is going to pass through a narrow die. We expect to see an eddy in each corner of barrel. The result has shown that increasing of De number enhances the eddy magnitude; also with making acute angle, we see decreasing of eddy magnitude. Normal stresses and velocity were investigated in contraction and their results had good coincidence with other literatures in behavior. These investigations indicate effect of De number on normal stress and velocity, these results show an overshoot in normal stress and velocity figures, magnitude of these overshoots depends of De number. Finally, the effect of De number was investigated with experimental results and experimental works confirm modeling results
Keywords:
Modeling ; Viscoelastic Fluids ; Short Fiber Suspension ; De Number Effect

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