Direct Numerical Simulation of Magnetic Particles Suspended in a Newtonian Fluid Exhibiting Finite Inertia Under SAOS

Mohammad Reza Hashemi, M.T. Manzari, Rouhollah Fatehi

Research output: Contribution to journalArticle

2 Citations (Scopus)
5 Downloads (Pure)

Abstract

A direct numerical simulation approach is utilized to understand the oscillatory shear rheology of a confined suspension of magnetic chains formed by paramagnetic circular cylinders under the influence of an external magnetic field. The common assumption of gap-spanning chains made in the literature is relaxed in this work, so that a fully suspended (periodic) array of magnetic chains is formed. In this sense, the effective rheological parameters are only influenced through a layer of fluid adjacent to the walls. All tests are conducted at very low but finite particle Reynolds numbers, and typical inertial effects are discussed. The main aim of the present study is to investigate the apparent viscoelasticity of the system as a function of the external magnetic field and frequency of the input strain. This work concentrates on cases with large blockage ratio in order to have pronounced viscoelastic behaviours.
Original languageEnglish
Pages (from-to)8-22
Number of pages15
JournalJournal of non-Newtonian fluid mechanics
Volume256
Early online date13 Mar 2018
DOIs
Publication statusPublished - Jun 2018

Fingerprint

Newtonian fluids
Direct numerical simulation
Newtonian Fluid
direct numerical simulation
inertia
Inertia
Magnetic fields
External Field
Fluids
Viscoelasticity
Circular cylinders
Magnetic Field
Rheology
Suspensions
Reynolds number
viscoelasticity
circular cylinders
Circular Cylinder
rheology
magnetic fields

Keywords

  • Magnetorheology
  • Small amplitude oscillatory shear
  • Magnetic chains suspension

Cite this

Direct Numerical Simulation of Magnetic Particles Suspended in a Newtonian Fluid Exhibiting Finite Inertia Under SAOS. / Hashemi, Mohammad Reza; Manzari, M.T.; Fatehi, Rouhollah.

In: Journal of non-Newtonian fluid mechanics, Vol. 256, 06.2018, p. 8-22.

Research output: Contribution to journalArticle

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AB - A direct numerical simulation approach is utilized to understand the oscillatory shear rheology of a confined suspension of magnetic chains formed by paramagnetic circular cylinders under the influence of an external magnetic field. The common assumption of gap-spanning chains made in the literature is relaxed in this work, so that a fully suspended (periodic) array of magnetic chains is formed. In this sense, the effective rheological parameters are only influenced through a layer of fluid adjacent to the walls. All tests are conducted at very low but finite particle Reynolds numbers, and typical inertial effects are discussed. The main aim of the present study is to investigate the apparent viscoelasticity of the system as a function of the external magnetic field and frequency of the input strain. This work concentrates on cases with large blockage ratio in order to have pronounced viscoelastic behaviours.

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