Device for releasing pellets in liquid viscosity coefficient experiment

Abstract

The invention provides a device releasing a small ball in a liquid viscosity coefficient experiment, which belongs to the field of application of an alternating current electromagnet and comprises a magnetic field generating device, a control module, a first potentiometer, a second potentiometer, a switch K0 and a direct current power source E; an anode of the direct current power source E is connected with a power source input end of an inversion control module by the switch K0 and the second potentiometer; a cathode of the direct current power source E is connected with a grounding end of the inversion control module of which an output end is connected with the magnetic field generating device by the first potentiometer; the magnetic field generating device mainly comprises a metal core and a coil winding the metal core; a lower end of the metal core is a sharp end. The sharp end of the metal core wound by the metal coil adsorbs the small ball, when an alternating current in the metal coil is slowly reduced, the metal core is demagnetized to enable the small steel ball stained with glycerol to fall along the axis of a graduate, thus solving the problem of large error and inconvenience in operation in the existing liquid viscosity coefficient experiment.

Description

technical field [0001] The invention relates to the application field of an AC electromagnet, in particular to a device for releasing small balls in liquid viscosity coefficient experiments. Background technique [0002] At present, most of the measurement of the viscosity coefficient of liquid adopts the Stokes formula and utilizes the falling ball method to measure, even if the small steel ball freely falls into the graduated cylinder filled with glycerin (with a larger viscosity coefficient) along the vertical direction, and Falling along the central axis, the falling time is measured by the upper and lower lasers, and then the viscosity coefficient of the liquid is obtained. In order to ensure that the small steel ball is along the central axis of the measuring cylinder, a guide tube is often placed on the test stand. [0003] In principle, during the measurement of the viscosity coefficient of glycerin, the small steel ball should be covered with glycerin, but when it ...

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Problems solved by technology

[0004] The invention provides a device for releasing small balls in the liquid viscosity coefficient experiment, which solves the problems of large error and inconvenient operation in the existing liquid viscosity coefficient experiment

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