Relative viscosity of emulsions in simple shear flow: Temperature, shear rate, and interfacial tension dependence

Se Bin Choi, Joon Sang Lee

Research output: Contribution to journalArticle

Abstract

We simulate an emulsion system under simple shear rates to analyze its rheological characteristics using the lattice Boltzmann method (LBM). We calculate the relative viscosity of an emulsion under a simple shear flow along with changes in temperature, shear rate, and surfactant concentration. The relative viscosity of emulsions decreased with an increase in temperature. We observed the shear-thinning phenomena, which is responsible for the inverse proportion between the shear rate and viscosity. An increase in the interfacial tension caused a decrease in the relative viscosity of the decane-in-water emulsion because the increased deformation caused by the decreased interfacial tension significantly influenced the wall shear stress.

Original languageEnglish
Pages (from-to)677-682
Number of pages6
JournalTransactions of the Korean Society of Mechanical Engineers, B
Volume39
Issue number8
DOIs
Publication statusPublished - 2015 Aug

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Shear flow
Shear deformation
Emulsions
Surface tension
Viscosity
Temperature
Shear viscosity
Shear thinning
Shear stress
Surface active agents
Water

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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AB - We simulate an emulsion system under simple shear rates to analyze its rheological characteristics using the lattice Boltzmann method (LBM). We calculate the relative viscosity of an emulsion under a simple shear flow along with changes in temperature, shear rate, and surfactant concentration. The relative viscosity of emulsions decreased with an increase in temperature. We observed the shear-thinning phenomena, which is responsible for the inverse proportion between the shear rate and viscosity. An increase in the interfacial tension caused a decrease in the relative viscosity of the decane-in-water emulsion because the increased deformation caused by the decreased interfacial tension significantly influenced the wall shear stress.

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