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Acoustic sensing of hydrodynamic vortex flow

Ezersky A., Gromov P., Soustov P., Chernov V.

Hydroacoustics

2005

Vol. 8

47-52

We report the results of experiments of sound scattering by a vortex flow formed behind a grid of vertical cylinders placed in an air flow. The experiments were carried out in a low turbulence wind tunnel at a low Reynolds number. The vortex flow was formed behind a grid of 3-10 of hollow cylinders with the d=2 mm and length 30 mm. During the experiments we could change the gap between the cylinders g=L/d (where L is a distance between the cylinders surfaces) from 3 to 5. The experiments showed that at a certain value of g vortex flows behind different cylinders could synchronize and this effect could be easily detected by means of distant acoustic sensing. This result was also confirmed by means of direct measurements of velocity field of the vortex flow.

Rotation motion of particles in sound field

Didenkulov I., Ezersky A., Selivanovsky D., Chernov V.

Hydroacoustics

2003

Vol. 6

167--170

It is known that sound field produces longitudinal oscillation motion of medium. If there are floating particles in a medium those particles oscillate together with liquid. In this paper we consider dynamics of floating particles, which have rotational oscillations in acoustic field. This novel phenomena produces additional sound attenuation due to viscous damping. In the present paper this effect is analytically described. The expression for sound attenuation in suspensions of such particles and estimations of the value of the effect are obtained, and possible applications are discussed.