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Method for measuring liquid surface tension based on axisymmetrical liquid drop profile curve and volume

A technology of contour curve and measurement method, applied in the direction of surface tension analysis, etc., can solve problems such as difficult to use interfacial tension test, limit the test range, etc., and achieve the effect of simplifying the test complexity

Inactive Publication Date: 2013-04-03
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the sessile drop method, when the liquid interfacial tension is small, the contact angle formed between the droplet and the surface of the auxiliary test platform is small, making this method difficult to test the interfacial tension of liquids with low interfacial tension
The above two points limit the test scope of this method

Method used

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  • Method for measuring liquid surface tension based on axisymmetrical liquid drop profile curve and volume
  • Method for measuring liquid surface tension based on axisymmetrical liquid drop profile curve and volume
  • Method for measuring liquid surface tension based on axisymmetrical liquid drop profile curve and volume

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Effect test

Embodiment 1

[0032] Embodiment 1 (known ρ=1000kgm 3 ,g=9.8m / s 2 , Sessile drop method, the standard interfacial tension of the liquid is 72mN / m)

[0033] In order to verify the correctness of the proposed measurement method, this embodiment uses the method of this patent to measure and calculate the parameters of the simulated droplet profile curve to obtain the interfacial tension of the liquid, and compare the interfacial tension with the one used in the simulation. The standard value of liquid interfacial tension is compared to verify the correctness of the measurement method. Documentation [M.Hoorfar andA.W.Neumann, Adv.Colloid Interf.Sci.121,25(2006)] shows that the axisymmetric drop profile curve obtained by the experiment satisfies the Laplace equation, so the simulation based on the Laplace equation obtains The theoretical droplet profile curve is correct, so measuring the profile curve can illustrate the correctness of the measurement method. The simulated droplet profile curve...

Embodiment 2

[0034] Embodiment 2 (known ρ=800kg / m 3 ,g=9.8m / s 2 , pendant drop method, the standard interfacial tension of the liquid is 10mN / m)

[0035] In order to verify the correctness of the proposed measurement method, this embodiment uses the method of this patent to measure and calculate the parameters of the simulated droplet profile curve to obtain the interfacial tension of the liquid, and compare the interfacial tension with the one used in the simulation. The standard value of liquid interfacial tension is compared to verify the correctness of the measurement method. Documentation [M.Hoorfar andA.W.Neumann, Adv.Colloid Interf.Sci.121,25(2006)] shows that the axisymmetric drop profile curve obtained by the experiment satisfies the Laplace equation, so the simulation based on the Laplace equation obtains The theoretical droplet profile curve is correct, so measuring the profile curve can illustrate the correctness of the measurement method. The simulated droplet profile curve...

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Abstract

The invention relates to a method for measuring liquid surface tension based on an axisymmetrical liquid drop profile curve and a volume. The method comprises the steps that image collecting equipment is used for shooting a picture of a liquid drop spreading on the upper surface of an auxiliary testing platform or a picture of a liquid drop hung below the surface of an axisymmetrical auxiliary support placed horizontally; the picture is processed to extract the liquid drop profile curve; a measuring point is selected from the liquid drop profile curve; geometric parameters on the liquid drop profile curve, which are relevant to the selected measuring point, are measured; the liquid drop volume from the selected measuring point to the liquid drop peak is worked out according to the liquid drop profile curve; and the liquid surface tension can be worked out directly or by using formulae gamma=(rhogVR-piRrhogr<2>H) / (2pir<2>-2piRrsin theta) or gamma=(rhogVR-piRrhogr<2>H) / (2piRrsin theta-2pir<2>) according to the measured geometric parameters and the volume. According to the method, image defects close to a contact line between the liquid drop profile curve and the surface of the auxiliary testing platform are avoided by the preferable measuring point.

Description

technical field [0001] The present invention relates to the technical field of performance testing of liquids or high-temperature melts, etc., and particularly refers to a method for measuring liquid interfacial tension by measuring the geometric parameters of the axisymmetric droplet profile curve and the liquid volume calculated based on the droplet profile curve. It is suitable for the case where the small droplet formed by the measured liquid is on the surface of the auxiliary measurement platform and the contact angle formed by the droplet profile curve and the surface of the auxiliary measurement platform is greater than 30°, or the small droplet is suspended on the axisymmetric auxiliary support surface (such as The measurement of liquid interfacial tension under the condition of symmetrical needle tube) is especially suitable for the measurement and analysis of liquid interfacial tension with only a small volume and extreme conditions such as high temperature and high p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/02
Inventor 李健金卫凤
Owner JIANGSU UNIV
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