The liquid-solid change phase method for the experiment of inverse ferrofluis topology

Abstract

Inverse ferrofluids refers to ferrofluids containing micron grade nonmagnetic particles. The typical inverse ferrofluids include nanowires, MAGIC fluids, magnetic complex fluids, magnetorheological fluids and bubbles. We will give a new kind of experimental method, namely liquid-solid phase change method. The liquid containing magnetic particles stirred uniformly is poured into the funnel of the experimental device, which forms a natural flow under the action of its own gravity. After that, the whole experimental device was placed in a low temperature environment. When the temperature of ferrofluids was lower than the crystal temperature of paraffin wax, the flow process stopped naturally. The experimental method is mainly through the experimental observation of the fluid dynamic behavior after the low transparency liquid or the opaque milky liquid with the addition of micron particles, which can overcome the limitation of the PIV, which can only observe the hydrodynamic behavior of particles added to the transparent liquid.