FIELD: hydrodynamics.
SUBSTANCE: method can be used as educational aid when studying transient processes in rotating fluid. Redox system is solved in fluid; fluid is poured into reservoir made in form of body of rotation with vertical axis of symmetry; registering electrode and ancillary electrode, which area exceeds the registering electrode's active area, are submerged into fluid. Both electrodes are connected to opposite poles of dc voltage supply; registering electrode is fixed independently on reservoir; reservoir is driven into rotation to work with permanent angular speed. Electric current flowing through registering electrode is measured as function of time. Beginning of increment in current is used as sign of coming of front of rotation of fluid from reservoir's wall to place of disposition of active part of registering electrode. Time delay in current rise is measured after reservoir begins to rotate. Measured delay time is used to judge on radial speed of front of rotation of fluid. Disturbance in monotonous rise of current in time, which rise has shape of current oscillations, is presented as sign axial symmetry of flow due to formation of axes oriented in opposition. Period of oscillation of current is compared with period of rotation of reservoir. Coincidence of both periods is interpreted as resonance with vortex localization in coordinate system, which coordinate system rotates together with reservoir. Registering electrode is made in form of electro-conducting band. Band has active and console parts along its length; both parts are submerged into fluid. Console part is covered with isolating film. One end of console part is fastened to vertical rod for putting rod in coincidence with axis of rotation of reservoir. End of console part, remote from rod, has longitudinal curve and it adjoins active part in form of plate oriented along axis of rotation of reservoir.
EFFECT: demonstration of vortex resonance phenomenon.
23 cl, 55 dwg
