Magnetic traveling-stripe-forcing: enhanced transport in the advent of the Rosensweig instability

TL;DR

This paper introduces a contactless ferrofluid pumping method using a spatio-temporally modulated magnetic field that enhances fluid transport through resonance with surface waves, validated by X-ray measurements and theoretical analysis.

Contribution

It presents a novel magnetic forcing technique that significantly improves ferrofluid transport by exploiting surface wave resonance phenomena.

Findings

Resonance enhances ferrofluid transport efficiency.

X-ray measurements confirm the pressure gradient and fluid ramp.

Theoretical analysis explains the dispersion relation influence.

Abstract

A new kind of contactless pumping mechanism is realized in a layer of ferrofluid via a spatio-temporally modulated magnetic field. The resulting pressure gradient leads to a liquid ramp, which is measured by means of X-rays. The transport mechanism works best if a resonance of the surface waves with the driving is achieved. The behavior can be understood semi-quantitatively by considering the magnetically influenced dispersion relation of the fluid.