NDLI: Mesoscopic simulation of the transient behavior of semi-diluted polymer solution in a microchannel following extensional flow

Content Provider	Springer Nature Link
Author	Litviv, Sergey Hu, Xiangyu Ellero, Marco Adams, Nikolaus
Copyright Year	2013
Abstract	Using dissipative particle dynamics simulation, we investigate the transient behavior of a semi-dilute polymer solution in a microchannel at moderate Weissenberg numbers. The employed simulation method allows to study macroscopic properties of the solution and their relation to the microscopic properties of individual polymer. The solution enters the channel following an extensional flow with all polymers uniformly stretched. We observe that the shape of the velocity profile varies along the channel, from an almost parabolic to center-flattened type. The fully developed velocity profile at equilibrium is accurately described by the Carreau-Yasuda rheological model. We find that the relaxation time for the profile shape is equal to the relaxation time of the polymer extension in the flow direction. The established relation offers the potential to be utilized for microfluidics-based rheometers which measure, besides the steady solution rheology, also the polymer relaxation time using flow velocity data only.
Starting Page	257
Ending Page	264
Page Count	8
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	16
Issue Number	1-2
e-ISSN	16134990
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-05-31
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Fluid Dynamics Biomedical Engineering Analytical Chemistry Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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