Method for measuring surface tension coefficient of liquid by virtue of liquid discharge of hollow cylinder

Abstract

The invention discloses a method for measuring the surface tension coefficient of liquid by virtue of liquid discharge of a hollow cylinder and relates to measurement of physical parameters. The technical scheme is as follows: the bottom part of the hollow cylinder is sealed, the upper end of the hollow cylinder is opened, the outer radius of the hollow cylinder is R, and the average density of the hollow cylinder is 0.5-0.8 times the density of the liquid; liquid is injected into a water overflowing groove, when no liquid drips at the tail end of a flow guiding channel, the mass m1 of a water cup is measured, and then the water cup is put just below the tail end of the flow guiding channel; the mass m of the hollow cylinder is measured, the hollow cylinder is slowly put into the water overflowing groove, when no liquid drips from the tail end of the flow guiding channel, the mass m2 of the water cup containing the liquid is measured, and the surface tension coefficient sigma of the liquid is equal to (m-(m2-m1))*g / (2pi R). The method disclosed by the invention has the beneficial effects of simple structure, low cost and easiness in operation.

Description

technical field [0001] The invention relates to the measurement of physical parameters, especially the measurement of the surface tension coefficient of liquids. Background technique [0002] Common methods for measuring the surface tension coefficient of liquids are: maximum bubble pressure method, capillary method, pull-off method, etc. The measurement methods are either relatively complicated, such as the maximum bubble pressure method, pull-off method; or the measurement accuracy is not high, although the capillary method is simple , but the liquid surface is curved, and the height of the liquid column is not accurate enough. Since the liquid surface outside the capillary also rises along the tube wall outside the capillary, it is difficult to determine the coordinate value of the horizontal position of the liquid surface, which leads to the determination of the inside of the capillary. The height difference of the liquid column is more difficult. Contents of the inven...

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Problems solved by technology

[0002] Common methods for measuring the surface tension coefficient of liquids are: maximum bubble pressure method, capillary method, pull-off method, etc. The measurement method is either complicated, such as the maximum bubble pressure method, pull-off method; or the measurement accuracy is not high, although the capillary method is simple , but the liquid surface is curved, and the height of the liquid column is not accurate enough. Since the liquid surface outside the capillary also rises along the tube wall outside the capillary, it is difficult to determine the coordinate value of the horizontal position of the liquid surface, which leads to the determination of the inside of the capillary. The height difference of the liquid column is more difficult

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