ИСТИНА

The behavior of the grasped subjects in atmosphere, and at ocean vortices, at times is unpredictable. Theoretical research of shifting of the irregular form fragments by non-stationary vortical currents practically isn't developed, owing to complexity of process. Laboratory modeling of process in controllable external conditions can appear useful in an estimation of influence of major factors, for example, on dynamics of a plastic garbage stain and its separate components in the ocean. Impurity carrying over in upper layer is influenced by large-scale vortical currents, excitement and a wind. At the first stage interest represents studying of influence not uniform distribution of vorticity. Such currents are realized in various laboratory installations of circulating type. Convenient object of researches is the superficial current which is formed by the rotating disk established at the bottom of the cylindrical container. The purpose of the given work – studying of various forms floating particles dynamics on a surface of the compound vortex modeling vortical system with a drain in the center and inflow of a liquid on periphery in controllable external conditions. Basis of laboratory installation is the container – the cylinder which height is seventy cm. and internal diameter is twenty-nine and a half cm. At the bottom of the container the smooth disk rotates. Diameter of a disk is 5 cm., a thickness is 2 mm. The top edge of a disk settles down on distance 2 cm. from a container bottom. At level of the top edge the falsh-bottom is established. Frequency of rotation of a disk is equal five hundred turns per minute. Before the beginning of experiment the container is filled with the decontaminated water. Depth of a layer of a liquid in the given experiments was (40)forty sm. On a liquid surface the floating marker was located. Two types of markers were used in the experiment: the first one – a polypropylene test tube (height of 3 cm, a diameter about 8 mm) weighted by a lead grain for vertical orientation in a liquid, the second – polypropylene flat squares of 2 cm side. Video-registration was spent by means of the digital camcorder located vertically over the center of container. Recording of movement of a marker began with the moment of a start of motion of a marker and proceeded during all experiment. Video processing in Adobe Photoshop shell program allowed to track trajectories of particles (fig. 2.) and their angular position, label position on a cover, and also to measure angular velocities, as around the center of the container Ω and their own ω. The trajectory of a square marker is smoother. Apparently this is due to the influence of the vertical size of the marker on the trajectory. One of the most important parameters in the marker transfer is the dependence of the angular velocity of the marker rotation around the center on the own angular velocity (fig.3). For each marker was conducted three experiments, the results of treatment are presented. It is seen that the experimental data consistently reproduced. Type of these dependences most coincides with the exponential. There are approximations for the entire dataset for each type of marker. Conclusions: 1. Installation for measurements with reproduced conditions is created. 2. The cycle of experiences on studying of trajectories of solid markers in a compound vortice is executed. 3. The marker rotates both round the center and round own axis. 4. The instant center of rotation of a current is displaced concerning the center of symmetry of the container. 5. The dependence of the angular velocity of the marker rotation around the center on the own angular velocity is defined.