Interaction between magnetic field and electric current in conductive fluid

An electromagnetic pump is a device that uses the interaction of magnetic field and electric current in conductive fluid to make the fluid subject to electromagnetic force to generate pressure gradient, so as to promote fluid movement. In practice, it is mostly used to pump liquid metal, so it is also called liquid metal electromagnetic pump. The electromagnetic pump can be divided into AC pump and DC pump according to the form of power supply; According to the way of current feeding in liquid metal, it can be divided into conductive electromagnetic pump and inductive electromagnetic pump; According to different structures, it can be divided into planar pump and cylindrical pump. In the conductive pump, the current is directly transmitted to the liquid metal by the external power through the electrodes on both sides of the pump ditch; In the induction pump, the current is induced by the alternating magnetic field. The electromagnetic pump has no rotating parts, simple structure, good sealing and reliable operation, so it is used to transport some toxic heavy metals, such as mercury, lead, etc. in the chemical and printing industries; In the atomic power industry, it is used to transport metals with particularly active chemical properties, such as sodium, potassium, sodium potassium alloys; It can be used as a quantitative pump for active metals such as aluminum and magnesium in casting enterprises, but now it is mainly used by large enterprises such as military industry. The disadvantage of electromagnetic pump is its low efficiency, which has not been widely used in smelting and casting industries.

2015

11-19

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