Paramagnetic liquid bridge in a gravity-compensating magnetic field

Abstract

Magnetic levitation was used to stabilize cylindrical columns of a paramagnetic liquid in air between two solid supports.The maximum achievable length to diameter ratio R_,× was -(3.10 ± 0.07), very close to the Rayleigh-Plateau limit of_. For smaller R, the stability of the column was measured as a function of the Bond number, which could be continuously varied by adjusting the strength of the magnetic field.

Rayleigh-Taylor Instability Experiments with Precise and Arbitrary Control of the Initial Interface Shape

“…To date experiments have been based mainly on physical motion of the cell [5,7,10 -15]. These protocols suffer from jitter and not-well-controlled initial conditions and tend to be poorly suited for establishing initial interface perturbations that involve a specific single mode or spectrum of modes [13,16].In this Letter we demonstrate how an extension of our magnetic levitation technique [17,18] enables us to finetune the initial conditions. We accomplish this by affixing precisely shaped magnetically permeable materials to the outside of the fluid cell, which perturb the magnetic force and thereby the shape of the interface.…”

Creating non-planar static interfaces with magnetic fields

“…Fluids 10, 2208(1998). By doping water with MnCl 2 , the susceptibility χ of a fluid can be changed from diamagnetic to paramagnetic and its magnitude increased drastically.…”

Stability of Magnetically Levitated Liquid Bridges of Arbitrary Volume Subjected to Axial and Lateral Gravity

“…Figure 1 shows the experimental arrangement for the horizontal bridges; the geometry for the vertical bridges is analogous, and is shown in Ref. (5). The magnetic force per unit volume is given by…”

“…Since then the stability and the shapes of these zones have continued to be of scientific interest (2). Conventional liquid bridge experiments are typically performed in a Plateau tank (3), wherein the bridge is surrounded by an immiscible, near-density-matched bath; in a space-borne environment (4); or recently using magnetic levitation of a paramagnetic fluid (5). The effect of gravity is typically expressed in terms of the dimensionless Bond number B, which is defined as B ϭ gd 2 /4, where g is the gravitational acceleration, is the density difference between the bridge and surrounding medium, and is the surface tension at the fluid-bath interface.…”