Method for generating electromagnetic force with temporal and spatial variation in conducting liquid by adopting fluid driving

Abstract

The invention relates to a method for generating electromagnetic force with temporal and spatial variation in a conducting liquid by adopting fluid driving, and belongs to the technical field of electromagnetic metallurgy, preparation of semiconductor materials, chemical industry and glass industry. The method comprises the following steps: firstly, a cylindrical cavity body is formed in a conducting liquid, wherein the cavity body is provided with a driving fluid channel port, a turbine blade is arranged in the cylindrical cavity body, and a permanent magnet and the turbine blade are fixed oppositely; the driving fluid enters or flows out from a channel port of the cavity body according to the cycle P, drives the turbine blade to rotate forward or backward according to the cycle P, and drives the permanent magnet to rotate, and a rotary magnetic field for cyclic variation in direction is generated; and eddy current is generated in the conducting liquid at the periphery outside the cavity body, the rotary magnetic field and the eddy current interact, and the electromagnetic force is generated so as to drive or stir the conducting liquid. An electromagnetic driver formed by adopting the method provided by the invention can be used in a metal condensation process to improve macrosegregation, a metal alloying process as well as the field for preparing gradient materials, composite materials and the like.

Description

technical field [0001] The invention relates to a method for generating a time-space-varying electromagnetic force in a conductive liquid driven by a fluid, and belongs to the technical fields of electromagnetic metallurgy, semiconductor material preparation, chemical industry and glass industry. Background technique [0002] Due to the restriction of the skin effect, the traditional electromagnetic actuation technology is extremely limited in the actuation effect for larger-sized conductive liquids. The patent (application number: 201210039850.3) proposes a method of using fluid as the driving medium to generate electromagnetic force in a conductive liquid, replacing the electric or mechanical drive in the prior art with fluid drive, so as to simplify the structure of the electromagnetic drive and increase the design flexibility. flexibility, and expand the application range of electromagnetic drives. However, the traditional electromagnetic drive technology and the above ...

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Problems solved by technology

However, the traditional electromagnetic drive technology and the above method have the following disadvantages: the magnetic field has a single form, and the generated electromagnetic force has a relatively fixed spatial distribution, so the flow field of the driven conductive fluid generally does not change with time, and the spatial distribution of the electromagnetic force in the conductive liquid Poor adjustability has the following disadvantages:

[0003] (i) For the solidification of alloys, due to the fixed forced convection mode of the metal liquid, the solute redistribution effect is poor, and studies have shown (Wang Xiaodong et al., Materials Forum, Vol. 508, pp. 163-168): sometimes inappropriate The action of electromagnetic field not only cannot eliminate the concentration segregation, but also increases the concentration segregation, directly destroying the service performance of the material;

[0004] (ii) A stable thermal boundary layer is formed in the conductive fluid, and the heat transfer effect is poor when sufficient heat transfer is required;

[0005] (iii) A stable fluid flow boundary layer is formed in the conductive fluid, and the conductive liquid cannot be stirred sufficiently;

[0006] (iv) A designable higher electromagnetic force density gradient field cannot be obtained as required

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