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Effect of solvent quality on Poiseuille flow of polymer solutions in microchannels: A dissipative particle dynamics study
Author(s) -
Xu Shaofeng,
Lou Yinghou,
He Ping,
Wang Xiangyang,
Wang Jiugen
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47345
Subject(s) - dissipative particle dynamics , hagen–poiseuille equation , solvent , theta solvent , polymer , materials science , particle (ecology) , chemical physics , brownian dynamics , flow (mathematics) , solvent effects , chemistry , thermodynamics , polymer chemistry , brownian motion , mechanics , composite material , physics , organic chemistry , oceanography , quantum mechanics , geology
ABSTRACT The Poiseuille flows of polymer solutions for varying quality solvents in microchannels have been simulated using dissipative particle dynamics. In particular, the velocity distributions and the polymer migration across the channel have been investigated for good, athermal, and poor solvents. The velocity profiles for all three kinds of solvent deviate from the parabolic profile, and the velocity profile of the athermal solvent falls in between the good solvent and the poor solvent. For the athermal solvent, a migration away from the wall due to the hydrodynamic interactions between the chains and the wall is observed, and a migration away from the channel center due to the different chain Brownian diffusivities is also observed. For the good solvent, because of the more stretched polymer chains, the migration away from the wall is stronger than that for the athermal solvent. However, the migration away from the channel center is not observed for good solvents. For the poor solvent, the hydrodynamic interaction within the chains is screened, and the polymer chains migrate toward the wall and appear to be absorbed by the wall. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47345.