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Yielding behavior of model magnetorheological fluids
Jose R Morillas1, Juan de Vicente
1Biocolloid and Fluid Physics Group and Excellence Research Unit 'Modeling Nature' (MNat), Department of Applied Physics, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071 - Granada, Spain. jvicente@ugr.es.
Soft Matter
|April 10, 2019
Summary
Magnetorheological fluid yielding was studied using simulations and experiments. Yield stress is inversely proportional to the sixth power of particle separation, matching experimental results.
Area of Science:
- Materials Science
- Rheology
- Computational Mechanics
Background:
- Magnetorheological (MR) fluids exhibit significant changes in viscosity and yield stress when subjected to a magnetic field.
- Understanding the yielding behavior of MR fluids is crucial for their application in dampers, brakes, and other devices.
- Previous models often simplified particle interactions and lattice structures.
Purpose of the Study:
- To investigate the yielding behavior of magnetorheological fluids using both computational simulations and experimental measurements.
- To analyze the influence of interparticle gap separation on the yield stress in model structures.
- To elucidate the role of magnetic field strength and surface slip effects in experimental observations.
Main Methods:
- Finite element method (FEM) simulations were performed on model structures, specifically monoclinic lattices (simple and body-centered).
- Experiments were conducted using a magnetorheometer to measure the yielding behavior under controlled magnetic fields.
- The study focused on varying the interparticle gap separation in simulations and analyzing magnetic field application and surface slip in experiments.
Main Results:
- FEM simulations revealed that yield stress (τ0) scales with interparticle center-to-center distance (h) as τ0/M² ∝ h⁻⁶, where M is particle magnetization.
- Experimental results showed good agreement with simulation predictions for yield stress.
- The findings were found to be independent of the specific particle packing arrangement and interparticle gap.
Conclusions:
- The study provides a validated model for predicting the yield stress of magnetorheological fluids based on interparticle spacing.
- Both computational and experimental approaches confirm the significant impact of particle magnetization and separation on fluid yielding.
- The research highlights the importance of considering interparticle interactions and magnetic field effects for accurate MR fluid behavior prediction.
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