What is the working principle of Magnetic stirrer?

Answer 1

A magnetic stirrer is helpful for dissolving solids in liquids. As there are several different appearances, all of them will at least have a base with a speed-controlled spinning magnet inside and an exterior stirring bar. You place the stirring bar into a flask or beaker by tenderly sliding it beside the wall of the container. To avert fracture, don't drop the bar onto the bottom of the container. Place the container on the stirrer base and turn the speed control knob to its lowest set. Use enough speed to start the bar turning in the container. If using exact volumes, as with a volumetric flask, be sure take the measurements before adding the stirring bar.When stirring is finished, keep the stirring bar in the container by draft the liquid into another container. Carefully wash the original container and the stirring bar.

Answer 2

he electromagnetic stirrer utilizes the principle of a linear motor and differs　from the conventional mechanical and decompression types as it is a noncontact stirrer in which no part touches the molten metal. As shown in the diagram, a coil installed at the bottom of the furnace generates a moving magnetic field (H) if a 3 phase AC voltage is applied to this coil (inductor). Electric power force is generated in the molten metal due to the action of the magnetic field (magnetic flux) and causes induction current (I) to flow (Fleming's right hand rule). This current then acts with the magnetic field of the inductor to induce electromagnetic force (F) in the molten metal according to Fleming's left hand rule. As this thrust moves in the direction of the moving magnetic field, the molten metal also moves. In other words, an stirring action is applied. Furthermore, as this thrust has components in the horizontal direction and in the vertical direction, the molten metal flows diagonally upwards and results in a uniform temperature in both the top and bottom layers of the molten metal.

　

Answer 3

The function of a stirrer is to agitate liquids for speeding up reactions or improving mixtures. The picture on the left is a magnetic stirrer used with hot plates. The picture on the right is a typical glass stirrer used in beakers or test tubes.

Answer 4

A magnetic stir bar is used to stir a mixture on a stir plate. The stir plate contains a magnet that spins, causing the magnetic stir bar to spin and stir the mixture. Many hot plates also have this feature built in.

Answer 5

A magnetic stirrer works by using a rotating magnetic field to create a vortex in a liquid solution. This vortex causes the liquid to mix and stir without the need for a mechanical stirring device. The stir bar, typically made of Teflon-coated magnetic material, is placed in the solution and is rotated by the magnetic field generated by the stir plate.

Answer 6

a) Stirring a solution with the magnetic stirrer

b) Simultaneously heating the same solution

Answer 7

A stir plate has a revolving magnetic field which forces the stir bar to spin and stir whatever liquid you have.

Answer 8

A magnetic sitter is a device used in a laboratory that employs a magnetic field to cause a stir bar immersed in a liquid to spin very quickly - stirring it.

Answer 9

A magnetic stirrer is used when mixing water and sulfuric acid. Depending on the size of the stirrer is what determines how much of the liquid you can mix.