Dynamics of Flow-Induced Structure Formation in Drag Reducing Polymer Solutions
Liberatore, Matthew Walter
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https://hdl.handle.net/2142/82358
Description
Title
Dynamics of Flow-Induced Structure Formation in Drag Reducing Polymer Solutions
Author(s)
Liberatore, Matthew Walter
Issue Date
2003
Doctoral Committee Chair(s)
McHugh, Anthony J.
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Language
eng
Abstract
Work on the effects of strong shear on the molecular weight stability finds small degradation in the polymers' average molecular weight and molecular weight distribution. Experiments with HPAM and PAM solutions in a large channel flow loop at Re ≥ 20,000 provide evidence of the importance of chain degradation to changes in drag reduction with time. Losses in molecular weight are small in the case of HPAM and do not correspond to losses in drag reduction. The PAM solutions demonstrate no change in the molecular weight distribution over the first 13--16% loss in DR followed by a loss in the high molecular weight tail at greater losses in DR.
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