Abstract
Investigation was made on an effect of the kinematic viscosity of a liquid on a swirl motion of the liquid in a cylindrical vessel. The swirl motion appeared when the liquid was agitated by bottom gas injection. Water and silicone oil were used as the working fluids. Particular attention was paid to the period, Ts, amplitude, A, starting time, Ts, s, damping time, Ts, d of the swirl motion. The preferable occurrence condition of the swirl motion was also determined. The occurrence region was expressed in terms of the aspect ratio and gas flow rate. It became narrow as the kinematic viscosity of liquid increased. An empirical equation was newly proposed for the amplitude, A. Empirical equations proposed previously for the remaining parameters, Ts, Ts, s Ts, d were applicable under the present experimental conditions.
