Method for measuring surface tension coefficient of liquid through discharging liquid by hollow cylinder

Abstract

The invention provides a method for measuring the surface tension coefficient of liquid through discharging liquid by a hollow cylinder, relates to physical parameter measurement and adopts the technical scheme that one hollow cylinder is adopted, the outer radius of the hollow cylinder is radius Out, the inner radius of the hollow cylinder is radius In, and the average density of the hollow cylinder is 0.5-0.8 times of liquid density; liquid is injected into an overflow trough until the liquid overflows from a guide ditch on the edge of the upper end of the overflow trough into a water cup at the lower end of the guide ditch, the mass m1 of the water cup is measured when liquid stops dripping from the bottom end of the guide ditch, and then, the water cup is put right below the bottom end of the guide ditch; the mass m of the hollow cylinder is measured, the hollow cylinder is slowly put in the overflow trough, liquid flows into the water cup from the bottom end of the guide ditch, and the mass m2 of the water cup holding the liquid is measured when no liquid drips from the bottom end of the guide ditch, and the surface tension coefficient of the liquid sigma=[m-(m2-m1)]*g / [2*pi*(R In+R Out)], wherein g refers to gravity acceleration. The method has the benefits of simple structure, low cost and easy 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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