ИСТИНА

The paper presents the experimental data, characterizing the transport of plastic markers on the free surface of composite vortex. The experiment was performed in the cylinder with internal diameter 29.4 cm. The smooth disk rotates at the bottom of the container. Frequency of rotation of a disk is equal 100 or 500 RPM. Before the beginning of experiment the con-tainer is filled with the decontaminated water. Depth of a layer of a liquid was 40 cm [1]. Fig. 1. The plastic markers used in the experiment (the big square (2 cm), the star and the probe (3 cm)). On a liquid surface the floating marker was located (Fig.1). Three types of markers were used in the experiment: the first one – a polypropylene test tube (height of 3 cm, a diameter of 8 mm) weighted by a lead grain for vertical orientation in a liquid, the second – polypropylene flat squares of 2 cm side, the third – polypropylene star with four rays (size about 1.5 cm). Video-registration was spent by means of the digital camcorder Panasonic NV-MX500 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. Fig. 2. The dependence of the marker rotation frequency on the marker rotation frequency around the center of the vortex a) probe b) square. Three experiments were conducted. In the first two experiments, the single marker was placed on the surface of the vortex. In the first – a probe, the second – a square. Experiments have shown that when the marker moves around the center of the vortex, rotation around its own axis appears, and the frequency of turns around its own axis is dependent on the frequen-cy of turns around the center of the vortex. In Fig. 2. are these dependents a) for the marker-probe and b) for the marker-square. Each graph is based on the results of three not dependent experiments. The data show that the relationship is stable reproduced in both cases. Fig. 3. The experiment with three markers (probe, star, square): the dependence of the own marker rotation frequency ω on the marker rotation frequency around the center of the vortex Ω. Fig. 3 shows the data of the experiment in which the surface of the vortex was placed simultaneously three different marker types (tube, star and square). During the markers movement the square, which has the largest area, occupied a central position in the vortex, more subtle marker-star rotates alongside, and a marker-probe is rotated on the periphery pe-riodically pushes back the first two markers. In all experiments, dependents of the own marker rotation frequency ω on the marker rotation frequency around the center of the vortex Ω have the same shape. REFERENCES 1. Budnikov A. A., Zharkov P. V., Chashechkin Yu. D. Experimental modeling of the shifting of floating objects in “garbage islands” // Moscow University Physics Bulletin. July 2012, V. 67, Issue 4, P. 403 – 408. DOI: 10.3103/S0027134912040042