The surface tension tester under the UHV power company can help many power workers conduct various power tests more conveniently.
The principle of surface tension testing is mainly to measure the tension on the surface of a liquid, in order to understand the surface properties and quality of the liquid. The following is a detailed explanation of the principle of surface tension testing:
1、 Basic concepts of surface tension
Surface tension is the interaction force between liquid molecules, manifested as the phenomenon of liquid forming a thin film on the surface. This force causes the liquid surface to have a tendency to shrink to the minimum area. The size of surface tension determines the dispersion, wetting, adhesion, foam, penetration, gelling and other characteristics of various liquid substances.
2、 The main principle of surface tension testing
The principle of surface tension testing is to determine the surface properties and quality of a liquid by measuring its surface tension. Common testing methods include contact angle method, hydrostatic pressure method, buoyancy method, bubble pressure method, lifting ring method, hanging drop method, etc. These methods each have their own characteristics, and suitable testing methods can be selected according to different needs.
Contact angle method: Calculate surface tension by measuring the contact angle formed when a liquid comes into contact with a solid surface. The larger the contact angle, the smaller the surface tension.
Bubble pressure method: Forming bubbles in liquid by applying pressure, measuring the pressure difference at the time of bubble rupture to calculate surface tension. The bubble pressure method is applicable to various liquids, including molten metals and molten salts.
Hanging ring method: The surface tension is calculated by measuring the tension required for the metal ring immersed in the liquid surface to detach from the liquid surface. The hanging ring method is suitable for measuring the surface tension of pure liquids, but it should be noted that the surface tension has a time effect.
Suspension drop method: Determine surface tension and contact angle based on the shape of the droplet. The hanging drop method is essentially a type of droplet shape method, which includes both hanging drop and lying drop methods.
3、 The Importance of Surface Tension Testing
Surface tension testing is of great significance for the application, production, quality control, and other aspects of liquids. Testing can help understand the surface properties of liquids and provide effective guidance for their applications. Meanwhile, surface tension testing is also an important means of product development and quality control, which can help optimize product performance and improve production efficiency
4、 Technical indicators for surface tension testing
The technical indicators of a surface tension meter include measurement range, indication error, resolution, repeatability error, etc. For example, the measurement range is usually 1-500mN/m, the indication error is 1%, and the resolution can reach 0.1mN/m or 0.01mN/m. When selecting testing instruments, it is necessary to comprehensively consider factors such as the nature and shape of the test object, as well as the accuracy of the testing requirements.
5、 Summary
The principle of surface tension testing is to determine the surface properties and quality of a liquid by measuring its surface tension. In practical applications, appropriate testing methods and instruments can be selected according to different needs. Surface tension testing is of great significance for the application, production, quality control, and other aspects of liquids.
