Experimental device and method for measuring liquid viscosity coefficient through U-shaped tube

Abstract

The invention discloses an experimental device and method for measuring a liquid viscosity coefficient through a U-shaped tube. The experimental device is composed of the U-shaped tube, a thin filament, a pulley block, a driving small ball, a driven small ball and experimental liquid. By analyzing the linkage movement of the two small balls connected to the two ends of the thin filament on the two sides of the U-shaped tube, and the liquid viscosity coefficient is obtained under the condition that the liquid density is not precisely measured and buoyancy is not calculated. According to the experimental method, by means of the stress of the small balls in the balanced state and the Stokes formula, the relation between the liquid viscosity coefficient and the terminal velocity of the small balls is acquired. The experimental method further includes the step that by changing the liquid level height, measuring the terminal velocity of the small balls and changing the average density of the driven small ball, the Reynolds number of the viscosity coefficient is corrected. The experimental device and method are clear in principle, equipment is simple, operation is fast, the falling speed of the driving small ball is effectively controlled by arranging the driven small ball, and the experimental device and method are suitable for measuring the liquid viscosity coefficient of small-viscosity liquid and are also suitable for physical experiment teaching.

Description

technical field [0001] The invention relates to a physical experiment device and method, in particular to an experimental device and method for measuring the viscosity coefficient of a liquid with a U-shaped tube. Background technique [0002] The viscosity coefficient is a physical quantity that expresses the properties of fluids. Measuring the viscosity coefficient of a liquid is of great significance to fields such as hydraulic engineering, petroleum engineering, and even medical engineering. For example, to study the energy loss of long-distance transport of liquids, the resistance of liquids during the diving process of underwater probes, the relationship between human blood viscosity and circulation speed, etc., it is necessary to first obtain the viscosity coefficient of the relevant liquids. At present, the falling ball method is often used to measure the viscosity coefficient of the liquid with a large viscosity coefficient in the laboratory. The falling ball metho...

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Problems solved by technology

In actual operation, due to the difference of the experimental balls, the experimental environment changes, and the discreteness of the experimental data is generally large.

[0005] Finally, in the experimental teaching, it is found that when the viscosity coefficient of the experimental liquid is small, the commonly used experimental balls have a large tailing speed, which not only makes the Reynolds number of the experimental environment too large, but also requires Reynolds number correction, and also makes the small ball It is difficult to accurately measure the tailing speed, which affects the accuracy of the experiment

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