Liquid surface tension coefficient measuring method

A technology of liquid surface tension and measurement method, applied in surface tension analysis and other directions, can solve the problems of inconvenient measurement and inaccurate measurement, and achieve the effect of simple and accurate measurement method

Inactive Publication Date: 2020-03-27
SICHUAN UNIV
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Problems solved by technology

[0002] The methods used to measure the surface tension coefficient of liquids include capillary method, drop weight method and pull-off method, etc. The capillary method needs to measure the angle (contact angle) between the liquid surface and the tube wall, which is not easy to measure; It is a dynamic measurement. Some liquid will shrink back in the drop weight method, and some liquid will adhere to the pull ring in the pull-off method, resulting in inaccurate measurement.

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Embodiment Construction

[0011] According to the method of measuring the surface tension coefficient of the liquid by the drop weight method, the relationship between the mass m of the droplet and the diameter d of the dropper (the outer diameter if it is infiltrated, and the inner diameter if it is not infiltrated) satisfies m*g=π*d*σ , that is, σ=m*g / (π*d); the existing problem is: when the liquid breaks into droplets, part of the liquid will shrink back, causing the mass m of the dripping droplets to decrease, which requires correction, and also As a result, the measurement method is inconvenient and even difficult to understand.

[0012] The present invention discusses this problem from another angle. The dripping of the liquid is caused by the insufficient surface tension of the liquid to hold the liquid, that is, the pressure (pressure) of the liquid column. Therefore, we discuss it from the perspective of pressure. : Liquid has surface tension on the upper surface of the container and the outle...

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Abstract

A liquid surface tension coefficient measuring method relates to measurement of liquid physical parameters and adopts the technical scheme that a spirit bubble is arranged on the bottom surface of theinner side of a cylindrical container, a water outlet pipe is fixed on the bottom surface of the cylindrical container, and the outer diameter of an outlet of the water outlet pipe is d; the inner bottom surface of the cylindrical container is horizontal; a recovery container is arranged below the outlet of the water outlet pipe of the cylindrical container; liquid is injected into the cylindrical container until liquid drops flow to the recovery container from the outlet of the water outlet pipe, the distance h between the liquid level at the upper end and the horizontal plane of the outletis measured when no liquid drops drop from the outlet of the water outlet pipe, and the diameter of the inner side of the cylindrical container is more than 100 times of the outer diameter of the outlet of the water outlet pipe; the surface tension coefficient sigma of the liquid is equal to rho * g * h * d / 4, rho is the density of the liquid, and g is the gravitational acceleration. The measurement method is simple and accurate.

Description

technical field [0001] The invention relates to the measurement of liquid physical parameters, especially the measurement of liquid surface tension coefficient. Background technique [0002] The methods used to measure the surface tension coefficient of liquids include capillary method, drop weight method and pull-off method, etc. The capillary method needs to measure the angle (contact angle) between the liquid surface and the tube wall, which is not easy to measure; It is a dynamic measurement. Some liquid will shrink back in the drop weight method, and some liquid will adhere to the pull ring in the pull-off method, resulting in inaccurate measurement. Contents of the invention [0003] The present invention measures the surface tension coefficient of the liquid from the perspective of pressure (that is, steady state, static state). [0004] The technical solution adopted by the present invention to realize the purpose of the invention is: a method for measuring the su...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/02
CPCG01N13/02
Inventor 胡再国
Owner SICHUAN UNIV
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