A system and method for testing rheological properties of magnetic liquids

Abstract

The invention provides a magnetic fluid rheological property test system and method. The test system comprises a motor control part, a torque signal acquisition part, a temperature acquisition part, an excitation part, a shear chamber, a support part, a signal acquisition system and an analysis system. The method includes: adding a to-be-tested fluid into the shear chamber, energizing an excitation coil with direct current to generate a magnetic field so as to change the properties of the to-be-tested fluid; setting the rotation speed of a servo motor, at the same time acquiring the friction torque transferred by the to-be-tested fluid through a torque sensor, collecting the motor rotation speed and torque into an analysis system, and calculating the rheological property parameters of the to-be-tested fluid by means of the shear chamber roller size, the shear chamber gap, the motor rotation speed and the friction torque; and at the same time, testing the properties of the to-be-tested fluid at different temperatures with a temperature sensor mounted in the shear chamber, and feeding back the to-be-tested fluid temperature in real time. The system and the method provided by the invention can measure the properties of some fluid like ferrofluid, magnetorheological fluid and the like under an applied magnetic field condition, and provide the property parameters of the test fluid for analysis, calculation and design.

Description

technical field [0001] The invention relates to the field of analysis and research of fluid properties, in particular to a system and method for analyzing and testing changes in fluid properties when an external magnetic field is applied. Background technique [0002] With the advancement of technology, ferrofluid, magnetorheological fluid and other smart fluids whose properties can be changed by an external magnetic field have been widely used in industrial production. The characteristic of this type of fluid is that ferromagnetic particles are dispersed in a certain matrix. When an external magnetic field is applied, the ferromagnetic particles will undergo changes such as accumulation and chain formation under the influence of the magnetic field, and the fluid can rapidly change its properties macroscopically. After the magnetic field is removed, the fluid can recover its general characteristics in a very short time and can be used repeatedly. At the same time, by changi...

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Problems solved by technology

Existing general fluid property testing instruments, such as ordinary rheometers, etc., cannot obtain the properties of the measured liquid when there is an external magnetic field

For example, the retrieved patent CN102713560B (detector and method for obtaining rheological property values) about rheological testing involves testing the rheological properties of ordinary liquids, but it is still unable to test the fluid properties when there is an external magnetic field

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