Transport of paramagnetic liquids under nonuniform high magnetic field

From recent investigations, the magnetic force generated by a heterogeneous high magnetic field has been highlighted, in particular by levitating systems. This paper is devoted to describing a new method for the analysis of the magnetic properties of liquids by using the magnetic force. This technique has consisted of observing and measuring the transport of a paramagnetic or diamagnetic liquid under the gradient of high magnetic fields. The theoretical approach of this phenomenon has been developed taking into account the fluid motion expanding in an axially symmetrical magnetic field. From this investigation, a typical experiment has been carried out by injecting a small amount of paramagnetic copper sulfate solution in a cell settled inside the bore of a superconducting magnet. Consequently, the accordance between the experimental results and the theoretical expectations has led to the determination of the magnetic susceptibility of the solution in a short time.