Numerical simulations for the rheological characteristics of emulsions under several conditions including temperature, shear rate, surfactant concentration and droplet size

Se Bin Choi, Jung Shin Lee, Seung Joo Baik, Joon Sang Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

An emulsion system was simulated under simple shear rates to analyse its rheological characteristics using the lattice Boltzmann method. The relative viscosity of an emulsion under a simple shear flow along with changes in temperature, shear rate, surfactant concentration and droplet size was calculated. The relative viscosity of emulsions decreased with increase in temperature. The shear thinning phenomena explaining the inverse proportion between shear rate and viscosity were observed. An increase in the surfactant concentration caused an increase in the relative viscosity for a decane-in-water emulsion, because the increased deformation caused by the decreased interfacial tension significantly influenced the wall shear stress. An increase in droplet size caused a decrease in the relative viscosity and smaller shear thinning behaviour because of decreased aggregational and repulsive forces within the emulsion system.

Original languageEnglish
Pages (from-to)896-900
Number of pages5
JournalMicro and Nano Letters
Volume9
Issue number12
DOIs
Publication statusPublished - 2014 Dec 1

Fingerprint

Emulsions
Surface-Active Agents
Shear deformation
emulsions
Surface active agents
surfactants
viscosity
shear
Viscosity
Computer simulation
shear thinning
Shear thinning
simulation
Temperature
temperature
Shear viscosity
Shear flow
shear flow
shear stress
Surface tension

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "An emulsion system was simulated under simple shear rates to analyse its rheological characteristics using the lattice Boltzmann method. The relative viscosity of an emulsion under a simple shear flow along with changes in temperature, shear rate, surfactant concentration and droplet size was calculated. The relative viscosity of emulsions decreased with increase in temperature. The shear thinning phenomena explaining the inverse proportion between shear rate and viscosity were observed. An increase in the surfactant concentration caused an increase in the relative viscosity for a decane-in-water emulsion, because the increased deformation caused by the decreased interfacial tension significantly influenced the wall shear stress. An increase in droplet size caused a decrease in the relative viscosity and smaller shear thinning behaviour because of decreased aggregational and repulsive forces within the emulsion system.",
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Numerical simulations for the rheological characteristics of emulsions under several conditions including temperature, shear rate, surfactant concentration and droplet size. / Choi, Se Bin; Lee, Jung Shin; Baik, Seung Joo; Lee, Joon Sang.

In: Micro and Nano Letters, Vol. 9, No. 12, 01.12.2014, p. 896-900.

Research output: Contribution to journalArticle

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