Device for measuring liquid surface tension coefficient through tearing-off method
A liquid surface tension and measuring device technology, applied in the field of physics teaching experiments, can solve the problems of inability to further study the specific influence of temperature, limit the in-depth development of academic research, and make it difficult to observe the change of tension, so as to avoid the premature rupture of the liquid film and slow change , the effect of small error
Inactive Publication Date: 2018-11-16
重庆知遨科技有限公司
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Problems solved by technology
Due to the rapid change of the tension before and after the liquid film breaks, it is not easy to observe the change of the tension before and after the break through the real-time display digital display
Moreover, in experimental teaching, students tend to use the difference between the maximum value of force and the stable value of force after fracture as the measurement value of surface tension, which will also lead to inaccurate measurement
[0006] 3. The existing measurement system has no heating and temperature control devices, and cannot carry out variable temperature experiments, and temperature is an influencing factor of the surface tension of liquids, so it is impossible to further study the specific influence of temperature on the surface tension of liquids, thus limiting the in-depth academic research carry out
Method used
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[0017] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0018] Such as figure 1 , 2 As shown, a pull-off liquid surface tension coefficient measuring device includes a suspension ring 1 and a base 4, wherein the suspension ring 1 is hoisted on a force-sensitive sensor 2, and the force-sensitive sensor 2 is installed on a bracket 3, which is fixedly installed on the base 4 superior. The bracket 3 is a "ten" shape structure, and the force sensitive sensor 2 is installed on the horizontal section.
[0019] Just below the suspension ring 1 is provided a petri dish 5 for containing the liquid to be tested, and the petri dish 5 is a glass vessel. The petri dish 5 is placed on an externally purchased heating sheet 6, and the heating sheet 6 is installed on the top surface of the placement platform 7. When the heating sheet 6 is energized, it can heat the liquid in the petri dish 5, thereby adjusting the temperature of...
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The invention discloses a device for measuring a liquid surface tension coefficient through an tearing-off method. A piston and an iron core are arranged in an outer cover; the upper ends of the two parts are fixed to the bottom surface of a placing table; the lower part of the piston is in sliding fit with an inner hole of a sleeve; the bottom of the sleeve is fixed to the top surface of a support seat; an opening in the bottom of the sleeve is connected with one end of a flexible pipe; two branch pipes are arranged at the other end of the flexible pipe; one branch pipe is connected with a one-way valve; the other branch pipe is connected with a flow limiting valve; the two branch pipes are connected with a liquid through hole in the bottom of a liquid tank; the liquid tank is filled withliquid; the upper part of the liquid tank is in sliding fit with a compression block. Through the device for measuring liquid surface tension coefficient through the tearing-off method, a hydraulic manner is used for enabling a lifting ring to lift a liquid film; the liquid film is slow and uniform in change and small in vibration, so that the defect that the liquid film is broken in advance dueto vibration in the existing manual operation manner can be effectively avoided, and the measurement accuracy is ensured.
Description
technical field [0001] The invention belongs to the field of physics teaching experiments, in particular to a device for measuring the surface tension coefficient of a pull-off method liquid. Background technique [0002] The experiment of measuring the surface tension of a liquid by the pull-off method is a classic experimental project in the "General University Physics Experiment". The measurement system used in this experiment is very conventional and mature. It is used to measure the surface tension coefficient of a liquid, and a force-sensitive sensor is used as a force sensor to measure force Variety. In the experimental measurement system, the force-sensitive sensor is fixed, and the lifting ring is suspended on the force-sensitive sensor. The rising liquid level contacts the lifting ring, and the ring-shaped liquid film is pulled up on the lifting ring. As the liquid level gradually drops, the force on the force sensor changes accordingly. The force change on the f...
Claims
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IPC IPC(8): G01N13/02
CPCG01N13/02G01N2013/0283
Inventor 罗洪梅龚恒翔
Owner 重庆知遨科技有限公司