Экспериментальное изучение колебательного движения жидкости в быстро вращающемся горизонтальном цилиндре под действием силы тяжести

The dynamics of liquid and heavy granular medium inside a rapidly rotating horizontal cylinder partially filled with liquid is experimentally studied. Multiphase system granular medium – liquid – air is centrifuged. Gravity induces oscillatory liquid motion near the sand which provokes the onset of spatially periodic quasi-stationary hills extended along the axis of rotation. The oscillatory liquid motion is studied with use of high-speed camera Optronis CamRecord CL600x2. The spectral analysis of experimental data documents that frequency of liquid oscillations near the granular medium is determined by rotation rate and velocity of inertial waves. The experimental results on liquid velocity are in qualitative agreement with theoretical predictions. The obtained results are necessary to determine governing parameters in the problem of liquid – sand interface stability.