Polygonal eddy current demonstration device
A demonstration device, polygonal technology, applied to educational appliances, instruments, teaching models, etc., can solve the problems of not being a liquid eddy current demonstration device, and achieve the effect of simple device structure, increased interactivity and playability, and simple operation
Pending Publication Date: 2021-04-23
NANKAI UNIV
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Problems solved by technology
However, it is an electromagnetic eddy current demonstration device. By energizing the coil group and generating a magnetic field, due to electromagnetic induction, an eddy current will be formed inside the metal ring. According to Lenz's law, the metal ring will move upward quickly and knock on the top of the guide rod. gong to demonstrate the vortex phenomenon to the audience, but it is not a liquid vortex demonstration device
Method used
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Effect test
Embodiment 1
[0031] Inject colored water into the cylinder, the height from the water surface to the bottom of the cylinder is 56mm, and the blue-black diluted ink used in this embodiment. Start the motor, start to slowly increase the motor speed, and observe the shape of the water vortex at the bottom of the drum.
[0032] 1. When the motor speed is adjusted to 30-53r / min, an elliptical eddy current can be observed at the bottom of the drum. get as image 3 The experimental phenomenon diagram at the speed of 35 is shown.
[0033] 2. When the motor speed is adjusted to 54-86r / min, a triangular eddy current can be observed at the bottom of the drum. get as Figure 4 The experimental phenomenon diagram when the rotation speed is 58r / min is shown.
[0034] 3. When the motor speed is adjusted to 87-100r / min, a quadrilateral eddy current can be observed at the bottom of the drum. get as Figure 5 The experimental phenomenon diagram when the rotation speed is 93r / min is shown.
[0035] 4....
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The invention relates to a polygonal eddy current demonstration device, which comprises a base bracket, a barrel (3), a disc (5), a waterproof rotating shaft (6), a motor (10), a motor speed regulator (7) and a coupler (8), and is characterized in that the base bracket is used for fixing the motor, the barrel and the motor speed regulator; the disc and the waterproof rotating shaft are fixed in the barrel; and the motor is fixed to the lower portion of the base bracket and connected with the base bracket through a coupler. The motor speed regulator is fixed to the base bracket and connected with the motor. A certain amount of water is filled in the barrel, the motor is started, the rotating speed of the motor is controlled through the motor speed regulator, and polygonal eddy phenomena such as ellipses, triangles and quadrangles can be observed in the barrel under certain conditions. The device is simple, the phenomenon is visual, the stability is good, and understanding and demonstration of the eddy current phenomenon are facilitated.
Description
technical field [0001] The invention belongs to the field of demonstration physical instrument production, and in particular relates to a polygonal eddy current demonstration device, which utilizes asymmetric perturbation to generate symmetry breaking, thereby generating polygonal eddy current phenomena. Background technique [0002] The liquid vortex refers to the water swirl generated when the liquid is driven by external rotation. Under certain conditions, the shape of the liquid surface becomes polygon-like. This is mainly due to the fact that when the liquid is perturbed by the asymmetrical perturbation of the azimuth wave number and frequency, the gravity wave and the centrifugal wave function produce multiple solutions (2 or 3), and resonance will be formed between some solutions, which leads to symmetry The property is broken, causing the liquid surface to show a polygonal process from circular axisymmetric to severely deformed, and form a polygonal vortex. [0003...
Claims
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IPC IPC(8): G09B23/12
Inventor 王晓杰李明浩王槿陈宗强赵春红孙骞孔勇发
Owner NANKAI UNIV