| Abstract: | The effect of the sinkhole position on the formation of nonstationary vortex funnels during fluid outflow from a tank whose diameter is much greater than the sinkhole diameter is studied experimentally. The devices for filling the tank were so designed that the opening of a sinkhole on the axis of a cylindrical tank immediately after it had been filled did not lead to the formation of a vortex funnel during fluid outflow. The formation of vortex funnels, when before the sinkhole was opened a disk immersed in the fluid was rotated, is investigated. In this case, a certain time after the outflow started, above the sinkhole a vortex funnel was formed. This time measured by means of digital filming depended on the sinkhole position and increased with the distance between the sinkhole and the axis. The results obtained make it possible to conclude that the symmetry strongly affects the process of vortex funnel formation. |
