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Title: Cross-stream migration of a Brownian droplet in a polymer solution under Poiseuille flow

Abstract

The migration of a Brownian fluid droplet in a parallel-plate microchannel was investigated using dissipative particle dynamics computer simulations. In a Newtonian solvent, the droplet migrated toward the channel walls due to inertial effects at the studied flow conditions, in agreement with theoretical predictions and recent simulations. However, the droplet focused onto the channel centerline when polymer chains were added to the solvent. Focusing was typically enhanced for longer polymers and higher polymer concentrations with a nontrivial flow-rate dependence due to droplet and polymer deformability. Brownian motion caused the droplet position to fluctuate with a distribution that primarily depended on the balance between inertial lift forces pushing the droplet outward and elastic forces from the polymers driving it inward. The droplet shape was controlled by the local shear rate, and so its average shape depended on the droplet distribution.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]
  1. McKetta Department of Chemical Engineering; University of Texas at Austin; Austin; USA
  2. Institute of Physics; Johannes Gutenberg University Mainz; Staudingerweg 7; 55128 Mainz; Germany
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Materials for Water and Energy Systems (M-WET); Univ. of Texas, Austin, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566644
DOE Contract Number:  
SC0019272
Resource Type:
Journal Article
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 15; Journal Issue: 15; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
catalysis (heterogeneous), charge transport, separations, membranes, water, mesoscale science, materials and chemistry by design, mesostructured materials, synthesis (novel materials), synthesis (self-assembly), synthesis (predictive)

Citation Formats

Howard, Michael P., Truskett, Thomas M., and Nikoubashman, Arash. Cross-stream migration of a Brownian droplet in a polymer solution under Poiseuille flow. United States: N. p., 2019. Web. doi:10.1039/c8sm02552e.
Howard, Michael P., Truskett, Thomas M., & Nikoubashman, Arash. Cross-stream migration of a Brownian droplet in a polymer solution under Poiseuille flow. United States. doi:10.1039/c8sm02552e.
Howard, Michael P., Truskett, Thomas M., and Nikoubashman, Arash. Tue . "Cross-stream migration of a Brownian droplet in a polymer solution under Poiseuille flow". United States. doi:10.1039/c8sm02552e.
@article{osti_1566644,
title = {Cross-stream migration of a Brownian droplet in a polymer solution under Poiseuille flow},
author = {Howard, Michael P. and Truskett, Thomas M. and Nikoubashman, Arash},
abstractNote = {The migration of a Brownian fluid droplet in a parallel-plate microchannel was investigated using dissipative particle dynamics computer simulations. In a Newtonian solvent, the droplet migrated toward the channel walls due to inertial effects at the studied flow conditions, in agreement with theoretical predictions and recent simulations. However, the droplet focused onto the channel centerline when polymer chains were added to the solvent. Focusing was typically enhanced for longer polymers and higher polymer concentrations with a nontrivial flow-rate dependence due to droplet and polymer deformability. Brownian motion caused the droplet position to fluctuate with a distribution that primarily depended on the balance between inertial lift forces pushing the droplet outward and elastic forces from the polymers driving it inward. The droplet shape was controlled by the local shear rate, and so its average shape depended on the droplet distribution.},
doi = {10.1039/c8sm02552e},
journal = {Soft Matter},
issn = {1744-683X},
number = 15,
volume = 15,
place = {United States},
year = {2019},
month = {1}
}

Works referenced in this record:

Continuous inertial focusing, ordering, and separation of particles in microchannels
journal, November 2007

  • Di Carlo, D.; Irimia, D.; Tompkins, R. G.
  • Proceedings of the National Academy of Sciences, Vol. 104, Issue 48, p. 18892-18897
  • DOI: 10.1073/pnas.0704958104