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An electromagnetic pump is a pump that moves
A magnetic field (brc) always exists around the current (I)-carrying conductor. When this current-carrying conductor is subjected to an external magnetic field (Bap), the conductor experiences a force perpendicular to the direction of I and Bap. This is because the magnetic field produced by the conductor and the applied magnetic field attempt to align with each other. A similar effect can seen between two ordinary magnets.
This principle is used in an electromagnetic pump. The current is fed through a conducting liquid. Two permanent magnets are arranged to produce a magnetic field Bap as shown in the figure. The supplied current has a current density (J) and the magnetic field associated with this current can be called "Reaction magnetic Field (brc)". The two magnetic fields Bap and brc attempt to align with each other. This causes mechanical motion of the fluid.
The Electromagnetic Pump
Lecture Demonstration Manual, University of Melbourne (archived)
Analysis and Design of Electromagnetic Pump
2010
Carli Precimeter GmbH (archived) Pumps {{Electromagnetism-stub
liquid metal
A liquid metal is a metal or a metal alloy which is liquid at or near room temperature.
The only stable liquid elemental metal at room temperature is mercury (Hg), which is molten above −38.8 °C (234.3 K, −37.9 °F). Three more ...
, molten salt
Molten salt is salt which is solid at standard temperature and pressure but enters the liquid phase due to elevated temperature. Regular table salt has a melting point of 801 °C (1474°F) and a heat of fusion of 520 J/g.Journal of Chemical T ...
, brine, or other electrically conductive
Electrical resistivity (also called specific electrical resistance or volume resistivity) is a fundamental property of a material that measures how strongly it resists electric current. A low resistivity indicates a material that readily allow ...
liquid using electromagnetism
In physics, electromagnetism is an interaction that occurs between particles with electric charge. It is the second-strongest of the four fundamental interactions, after the strong force, and it is the dominant force in the interactions of ...
.
A magnetic field is set at right angles to the direction the liquid moves in, and a current is passed through it. This causes an electromagnetic force that moves the liquid.
Applications include pumping molten solder
Solder (; NA: ) is a fusible metal alloy used to create a permanent bond between metal workpieces. Solder is melted in order to wet the parts of the joint, where it adheres to and connects the pieces after cooling. Metals or alloys suitable ...
in many wave soldering
Wave soldering is a bulk soldering process used for the manufacturing of printed circuit boards. The circuit board is passed over a pan of molten solder in which a pump produces an upwelling of solder that looks like a standing wave. As the ci ...
machines, pumping liquid-metal coolant, and magnetohydrodynamic drive
A magnetohydrodynamic drive or MHD accelerator is a method for propelling vehicles using only electric and magnetic fields with no moving parts, accelerating an electrically conductive propellant ( liquid or gas) with magnetohydrodynamics. The ...
.
Working principle
A magnetic field (brc) always exists around the current (I)-carrying conductor. When this current-carrying conductor is subjected to an external magnetic field (Bap), the conductor experiences a force perpendicular to the direction of I and Bap. This is because the magnetic field produced by the conductor and the applied magnetic field attempt to align with each other. A similar effect can seen between two ordinary magnets.
This principle is used in an electromagnetic pump. The current is fed through a conducting liquid. Two permanent magnets are arranged to produce a magnetic field Bap as shown in the figure. The supplied current has a current density (J) and the magnetic field associated with this current can be called "Reaction magnetic Field (brc)". The two magnetic fields Bap and brc attempt to align with each other. This causes mechanical motion of the fluid.
Einstein–Szilard electromagnetic pump
Designed for the Einstein–Szilard electromagnetic refrigerator (not the pumplessEinstein refrigerator
The Einstein–Szilard or Einstein refrigerator is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his form ...
), it uses electromagnetic induction to move conductive liquid metal without electrodes, to compress a working gas
For fluid power, a working fluid is a gas or liquid that primarily transfers force, motion, or mechanical energy. In hydraulics, water or hydraulic fluid transfers force between hydraulic components such as hydraulic pumps, hydraulic cylinder ...
, pentane. It is a liquid linear induction motor
A linear induction motor (LIM) is an alternating current (AC), asynchronous linear motor that works by the same general principles as other induction motors but is typically designed to directly produce motion in a straight line. Characteristica ...
.
See also
*Magnetic flow meter
A ''magnetic flow meter'' (mag meter, electromagnetic flow meter) is a transducer that measures fluid flow by the voltage induced across the liquid by its flow through a magnetic field. A magnetic field is applied to the metering tube, which resu ...
*Magnetohydrodynamic drive
A magnetohydrodynamic drive or MHD accelerator is a method for propelling vehicles using only electric and magnetic fields with no moving parts, accelerating an electrically conductive propellant ( liquid or gas) with magnetohydrodynamics. The ...
References
Bibliography
*Baker, Richard S., Tessier, Manuel J. ''Handbook of Electromagnetic pump technology''. 1987. osti 5041159. oclc 246618050.External links
The Electromagnetic Pump
Lecture Demonstration Manual, University of Melbourne (archived)
Analysis and Design of Electromagnetic Pump
2010
Carli Precimeter GmbH (archived) Pumps {{Electromagnetism-stub