Method for measuring surface tension coefficient of liquid through liquid drainage of semi-spherical shell with bottom hole

A liquid surface tension, liquid measurement technology, applied in the direction of surface tension analysis, etc., can solve the problems of inaccurate measurement of liquid column height, low measurement accuracy, difficult coordinate values, etc., to achieve simple structure, reduce measurement range and accuracy. Requirement, high cost effect

Inactive Publication Date: 2015-03-11
SICHUAN UNIV
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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

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  • Method for measuring surface tension coefficient of liquid through liquid drainage of semi-spherical shell with bottom hole
  • Method for measuring surface tension coefficient of liquid through liquid drainage of semi-spherical shell with bottom hole
  • Method for measuring surface tension coefficient of liquid through liquid drainage of semi-spherical shell with bottom hole

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[0008] A hollow (hollow) hemispherical shell 2, sealed by two hemispherical surfaces with a common center, the radius of the inner sphere is R 内 , the radius of the outer sphere is R 外 , the bottom of the hollow hemispherical shell 2 has a through hole 1, because it is a hemispherical shell, that is, the radius of the outer circle of the ring where the hemispherical shell opening 3 is located is R 外 , the radius of the inner circle is R 内 , the outer side of the hemispherical shell 2 and the inner side of the outer side, the best design is that the material of the bottom is thick and the material of the upper end is thin (the deformation occurs inside the cavity surrounded by the inner and outer hemispherical surfaces, and does not affect the hemispherical shape of the hemispherical shell 2 outside The shape of the surface), and distributed symmetrically about the central axis (rotating body), such as figure 2 Shown, just make its center of gravity shift to the bottom of he...

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Abstract

The invention relates to the measurement of physical parameters, in particular to a method for measuring the surface tension coefficient of a liquid through liquid drainage of a semi-spherical shell with a bottom hole. The method adopts the technical scheme that the inside semi-spherical radius of the hollow semi-spherical shell is R inside, the outside semi-spherical radius of the hollow semi-spherical shell is R outside, and a through hole is formed in the bottom of the hollow semi-spherical shell; the average density of the semi-spherical shell is 0.5 to 0.8 time of the liquid density; the liquid is injected into an overflow trough until the liquid overflows to a cup at the lower end of a guide trench through the guide trench at the upper edge of the overflow trough; when the liquid stops dripping at the tail end of the guide trench, the mass m1 of the cup is measured, and the cup is then placed under the tail end of the guide trench; the mass m of the semi-spherical shell is measured; the semi-spherical shell is slowly placed into the overflow trough, and the mass m2 of the cup accommodating the liquid is measured when no liquid drips at the tail end of the guide trench; the liquid surface tension coefficient sigma=[m-(m2-m1)]*g/[2*pi*(R2 outside+R2 inside)], R2 inside is the radius of the inside contact circle of the liquid level and the spherical shell, and R2 outside is the radius of the outside contact circle of the liquid level and the spherical shell. The method has the benefits 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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Application Information

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IPC IPC(8): G01N13/02
Inventor 李娟胡再国何原饶大庆雍志华罗明蓉穆万军邹旭敏王维果梁雅庭程艳刘石丹于白茹李伟梁小冲李紫源田野中朱俊
Owner SICHUAN UNIV
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