Influence of electromagnetic boundary conditions onto the onset of dynamo action in laboratory experiments

TL;DR

This paper investigates how different electromagnetic boundary conditions, including walls with varying properties and ferro-fluid motion, influence the initiation of dynamo action in laboratory experiments.

Contribution

It introduces a comprehensive analysis of boundary effects on dynamo onset, considering diverse wall properties and ferro-fluid dynamics, which was not extensively studied before.

Findings

Boundary properties significantly affect dynamo threshold.

Ferro-fluid motion alters magnetic field generation.

Different wall conductivities and permeabilities modify dynamo behavior.

Abstract

We study the onset of dynamo action of the Riga and Karlsruhe experiments with the addition of an external wall, the electro-magnetic properties of which being different from those of the fluid in motion. We consider a wall of different thickness, conductivity and permeability. We also consider the case of a ferro-fluid in motion.