Hydrodynamics and acoustics of gas inclusions in a magnetic fluid in the field of a ring magnet

Magnetic, acoustic and thermophysical phenomena in magneto-liquid systems have found application in the design of magneto-liquid sealers, shock absorbers, sensitive triaxial accelerometers, densitometers, and a number of other progressive devices. For the experiments, a special setup was created using a system of high-speed video recording of the experimental results, as well as with the registration of electromagnetic and acoustic disturbances with subsequent processing. For a series of samples of magnetic fluid, an experiment was conducted on the pressing of the air cavity, as a result of which gas bubbles were separated. The electromagnetic and acoustic disturbances arising during the ascent of a non-magnetic bubble in a magnetic fluid were recorded. Using well-known expressions, based on these data, bubble sizes were determined. The obtained data are compared with the results of video recording. Conclusions are drawn about the influence of the physical parameters of the magnetic fluid and the configuration of the magnetic field on the diameter of the resulting bubbles.