A Liquid Viscosity Test Method Based on Droplet Mechanical Vibration

Abstract

The invention relates to a liquid viscosity test method based on liquid drop mechanical vibration. The method concretely comprises the following steps that a hydrophobic substrate is placed on a ultrasonic probe of a Doppler ultrasonic instrument; liquid drops are generated on the hydrophobic substrate through a microinjector; the liquid drops are vibrated through a vibration triggering device with an automatic rebounding function; then, the vibration triggering device rebounds; the liquid drops generate free vibration; the free vibration of liquid drop surface capillary waves is converted into ultrasonic wave Doppler frequency shift signals by a non-focusing continuous wave Doppler method through the ultrasound probe, and the signals are amplified; a computer signal processing module collects and processes the Doppler frequency shift signals to obtain a liquid drop free vibration characteristic pattern; the free vibration characteristic pattern is subjected to fitting to obtain the decay rate of the liquid drop amplitude along with the time; further, the liquid viscosity is obtained through calculation. When the method is used for measuring the liquid drop viscosity, the responsespeed is high; the application range is wide; the reliability is high; the equipment is portable; the cost performance is high; the reagent consumption is little.

Description

technical field [0001] The invention belongs to the technical field of measuring liquid physical and chemical properties, and in particular relates to a liquid viscosity testing method based on liquid droplet mechanical vibration. Background technique [0002] Viscosity is an important physical characteristic of liquid, which is the internal friction force between molecules when the liquid is subjected to external force. In many fields, viscosity is one of the important parameters to characterize product quality. The traditional measurement methods of viscosity are mainly based on mechanical principles, such as capillary method, falling ball method and rotation method. Although the accuracy of the rotation method is high, for the determination of some blended polymers, since it can only measure the dynamic viscosity and cannot characterize the static viscosity, the blending state may be destroyed, and the capillary method cannot obtain accurate viscosity for some non-Newton...

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Problems solved by technology

Although the accuracy of the rotation method is high, for the determination of some blended polymers, since it can only measure the dynamic viscosity and cannot characterize the static viscosity, the blending state may be destroyed, and the capillary method cannot obtain accurate viscosity for some non-Newtonian fluids. value

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