Abstract
Contactless separation of particles, droplets, or bubbles in solid-liquid, solid-solid, liquid-liquid, and gas-liquid systems can be achieved using electric and magnetic fields. Dielectric levitation and magnetohydrostatic separation techniques exemplify such separation processes. In this paper, the analogy between dielectric and magnetic levitation in non-uniform fields is exploited to provide general conditions for stable, contactless suspension of particles, droplets, or bubbles. Certain general properties of axisymmetric (cusped) electric and magnetic fields are used to obtain general equations of motion for levitated objects.
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