Simulations of flow induced ordering in viscoelastic fluids

I.S. Santos de Oliveira

Abstract

In this thesis we report on simulations of colloidal ordering phenomena in shearthinning viscoelastic fluids under shear flow. Depending on the characteristics of the fluid, the colloids are observed to align in the direction of the flow. These string-like structures remain stable as long as the shear rate exceeds a critical value. This phenomenon has been subject of study for over 30 years, both theoretically and experimentally, because of to its importance in many technological processes, as for example in the food and cosmetics industry. Nevertheless, the mechanism driving the colloids to the aligned configuration has not yet been elucidated. The goal of this study is to simulate the alignment of colloids during shear flow in polymeric fluids with viscoelastic behavior. Besides that, colloid migration in confined systems was also investigated. A coarse-grained method based on Brownian dynamics was used, where every polymeric chain is modeled as a single particle. With these simulations we are able to obtain new insights and a better understanding for this ordering behavior.
Original languageEnglish
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Briels, Willem J., Supervisor
  • den Otter, Wouter K., Advisor
  • Briels, W.J., Supervisor
  • den Otter, W.K., Advisor
Date of Award7 Dec 2012
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-3479-6
DOIs
StatePublished - 7 Dec 2012

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colloids
fluids
shear flow
simulation
theses
food
strings
industries
alignment
shear
configurations

Keywords

  • IR-82516
  • METIS-290613

Cite this

Santos de Oliveira, I. S. (2012). Simulations of flow induced ordering in viscoelastic fluids Enschede: Universiteit Twente DOI: 10.3990/1.9789036534796
Santos de Oliveira, I.S.. / Simulations of flow induced ordering in viscoelastic fluids. Enschede : Universiteit Twente, 2012. 137 p.
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Santos de Oliveira, IS 2012, 'Simulations of flow induced ordering in viscoelastic fluids', University of Twente, Enschede. DOI: 10.3990/1.9789036534796

Simulations of flow induced ordering in viscoelastic fluids. / Santos de Oliveira, I.S.

Enschede : Universiteit Twente, 2012. 137 p.

Research output: ScientificPhD Thesis - Research UT, graduation UT

TY - THES

T1 - Simulations of flow induced ordering in viscoelastic fluids

AU - Santos de Oliveira,I.S.

PY - 2012/12/7

Y1 - 2012/12/7

N2 - In this thesis we report on simulations of colloidal ordering phenomena in shearthinning viscoelastic fluids under shear flow. Depending on the characteristics of the fluid, the colloids are observed to align in the direction of the flow. These string-like structures remain stable as long as the shear rate exceeds a critical value. This phenomenon has been subject of study for over 30 years, both theoretically and experimentally, because of to its importance in many technological processes, as for example in the food and cosmetics industry. Nevertheless, the mechanism driving the colloids to the aligned configuration has not yet been elucidated. The goal of this study is to simulate the alignment of colloids during shear flow in polymeric fluids with viscoelastic behavior. Besides that, colloid migration in confined systems was also investigated. A coarse-grained method based on Brownian dynamics was used, where every polymeric chain is modeled as a single particle. With these simulations we are able to obtain new insights and a better understanding for this ordering behavior.

AB - In this thesis we report on simulations of colloidal ordering phenomena in shearthinning viscoelastic fluids under shear flow. Depending on the characteristics of the fluid, the colloids are observed to align in the direction of the flow. These string-like structures remain stable as long as the shear rate exceeds a critical value. This phenomenon has been subject of study for over 30 years, both theoretically and experimentally, because of to its importance in many technological processes, as for example in the food and cosmetics industry. Nevertheless, the mechanism driving the colloids to the aligned configuration has not yet been elucidated. The goal of this study is to simulate the alignment of colloids during shear flow in polymeric fluids with viscoelastic behavior. Besides that, colloid migration in confined systems was also investigated. A coarse-grained method based on Brownian dynamics was used, where every polymeric chain is modeled as a single particle. With these simulations we are able to obtain new insights and a better understanding for this ordering behavior.

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M3 - PhD Thesis - Research UT, graduation UT

SN - 978-90-365-3479-6

PB - Universiteit Twente

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Santos de Oliveira IS. Simulations of flow induced ordering in viscoelastic fluids. Enschede: Universiteit Twente, 2012. 137 p. Available from, DOI: 10.3990/1.9789036534796