Document Type

Article

Journal/Book Title/Conference

journal of Magnetohydrodynamics

Publication Date

1-1-2010

Abstract

In the cryogenic realm, liquid oxygen (LOX) possesses a natural paramagnetic susceptibility and does not require a colloidal suspension of particles for practical application as a magnetic working fluid. Commercial ferrofluids have performed well in industrial applications, but expanding their workable range to low temperatures requires a suitable selection of the carrier fluid, such as LOX. In this chapter, the equation of motion for the pure fluid is derived and applied to a slug of LOX being displaced by a pulsed magnetic field. Its theoretical performance is compared to actual experimental data with discussion on empirical parameters, sensitivity to measurement uncertainty, and geometric similarity. The 1.1 T pulse of magnetic flux density produced oscillations in the slug of 6-8 Hz, generating up to 1.4 kPa of pressure change in a closed section when the slug acted like a liquid piston. The experiments and theoretical model demonstrate that LOX could be used as a magnetic working fluid in certain applications.

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