Long time viscosity of dilute magnetorheological dispersions under periodic magnetic perturbations

TL;DR

This study experimentally investigates how periodic magnetic perturbations influence the viscosity of dilute magnetorheological dispersions, revealing significant viscosity increases dependent on perturbation parameters and cluster structure rearrangements.

Contribution

It introduces experimental evidence on the impact of periodic magnetic perturbations on the viscosity of dilute magnetorheological dispersions, highlighting the dependence on amplitude, frequency, and timing.

Findings

Viscosity increases with periodic magnetic perturbations.

Changes depend on amplitude, frequency, and timing of the perturbation.

Cluster structure rearrangement explains viscosity variations.

Abstract

The effect of periodic magnetic perturbations on the rheological properties of a low concentration magnetorheological dispersion is studied experimentally. It is found that an important increment in the measured viscosity occurs when in addition to a static field a magnetic periodic perturbation is applied. The magnitude of these changes depend on the amplitude and frequency of the perturbation as well as on the simultaneity of the application of the static field and the perturbation. These findings are discussed in terms of the observed rearrangement of the cluster structure in the dispersion.