The determination of properties of magnetic fluids using ultrasound propagation measurement data. I. Experimental equipment and measurement technique. Experimental results

A. N. Vinogradov - V. V. Gogosov - G. S. Nikol'skii - A. A. Usanov - S. N. Tsurikov

Abstract
Acoustic properties of a dodekane-based magnetic fluid sample have been studied experimentally. The ultrasound propagation velocity and absorption coefficient were measured in the frequency range of 12...2000 MHz and at T = −10...lOO^° C. We also measured the density and viscosity of the magnetic fluid. It has been found that the ultrasound velocity within the limits of double experimental errors does not depend on frequency and decreases at increasing temperature.Absorption coefficient normalized to the squared frequency decreases at increasing frequency and exhibits a nonmonotonous behaviour when temperature changes. There is a decrease of both the magnet fluid density and viscosity at increasing temperature. Tabls 5, figs 2, refs 13.