A Method for Measuring Liquid Viscosity Coefficient Using Spring Ball System

Abstract

The invention discloses a method for measuring the viscosity coefficient of a liquid by using a small spring ball system. In the method, small balls with similar diameters and successively increasing densities are connected with light springs with similar length and rigidity to form a spring small ball system. Immerse the system in the experimental liquid whose viscosity coefficient is to be tested, release it twice at the center of the liquid surface, and measure the falling time of the spring ball system as a whole passing through the two measuring points in the liquid to be tested. The internal action of the ball system and the external load balance relationship are used to obtain the viscosity coefficient of the liquid. Compared with the existing method, the present invention is convenient and quick, easy to judge whether the ball has reached the stage of uniform falling, easy to control the falling shape of the system, simple equipment required, suitable for theoretical research on liquid viscosity coefficient, and also suitable for physical experiment teaching.

Description

technical field [0001] The invention relates to a physical experiment method, in particular to a method for measuring the viscosity coefficient of a liquid by using a small spring ball system. Background technique [0002] The measurement experiment of liquid viscosity coefficient is one of the important confirmatory experiments in university physics. The measurement methods mainly include falling ball method, falling needle method, capillary method and rotation method. Intuitive, easy for students to understand the physical meaning of liquid viscosity coefficient, and become a widely used measurement method of liquid viscosity coefficient. [0003] The advantage of the falling ball method is that it is easy to operate, but the disadvantage is that the error of the measurement result is relatively large. According to the research in the literature "Research on the Error of Measuring Liquid Viscosity Coefficient by Falling Ball Method" ("Laboratory Science", Volume 17, Issue...

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Problems solved by technology

However, the equipment of the needle drop method is complicated, and because before launching, the permanent magnet of the transmitter and the falling needle are magnetically attracted, and the upper end of the falling needle is spherical, which cannot be completely sealed with the horizontal end surface of the transmitter magnet, causing the needle to fall before launching. There is a deflection angle with the vertical direction, and the gravity of the falling needle is much smaller than the magnetic force, so it cannot be corrected by gravity

When launching, the transmitter forcibly distances itself from the falling needle, causing the falling needle to fall under gravity. At this moment, the entire instrument is under force, which interferes with the falling direction of the falling needle, and cannot effectively guarantee the falling angle and posture of the falling needle.

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