CN212872083U - Liquid surface tension coefficient and density synchronous measuring device - Google Patents
Liquid surface tension coefficient and density synchronous measuring device Download PDFInfo
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- CN212872083U CN212872083U CN201922016239.9U CN201922016239U CN212872083U CN 212872083 U CN212872083 U CN 212872083U CN 201922016239 U CN201922016239 U CN 201922016239U CN 212872083 U CN212872083 U CN 212872083U
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Abstract
The invention discloses a liquid surface tension coefficient and density synchronous measuring device. The measuring device comprises a thermostatic chamber and a control display area, wherein temperature sensors are arranged on the peripheral wall surface of the thermostatic chamber, and a high-precision force sensor is arranged on the upper wall surface of the thermostatic chamber. The metal ring, the liquid inlet pipe, the liquid outlet pipe, the buffer base and the beaker are arranged in the thermostatic chamber. The wall surface of the beaker is provided with a liquid level sensor. The control display area comprises a force sensor display screen, a sampling frequency setting button, a pause/start button, a clearing button, a liquid discharge flow rate display screen, a liquid inlet flow rate display screen, a liquid discharge flow rate control button, a liquid inlet flow rate control button, a temperature display screen and a liquid level display screen. And a USB data port is arranged on the side surface of the control display area.
Description
Technical Field
The invention relates to a physical experiment measuring device, in particular to a liquid surface tension coefficient and density synchronous measuring device.
Background
The surface tension of a liquid is caused by unbalanced forces on liquid molecules in the surface layer of the liquid, i.e., the molecules in the surface layer of the liquid are subjected to a resultant force directed towards the interior of the liquid, so that the surface of the liquid has a tendency to contract automatically. The surface tension coefficient of a liquid is an important parameter for the physical properties of a liquid surface. The surface tension coefficient is measured by a method commonly used for the measurement, such as a pull-off method, a static drop method, a rotary drop method, an isopycnic method, and a capillary rise method.
Density is an important parameter required in processes of identifying materials constituting an object, calculating the composition of various substances contained in the object, calculating the internal pressure of a liquid, measuring buoyancy, and the like. The density measurement can be classified into a direct measurement method and an indirect measurement method according to its measurement principle. The direct measurement method mainly comprises a density bottle method, a densimeter method, a hydrostatic balance method and the like, and the indirect measurement method comprises a vibration method, a ray method, an acoustic method and the like.
Disclosure of Invention
A device for synchronously measuring the surface tension coefficient and density of liquid is composed of a constant-temp chamber region and a control display region. The peripheral wall surfaces of the thermostatic chamber are provided with temperature sensors, and the upper wall surface is provided with a high-precision force sensor; the metal ring, the liquid inlet pipe, the liquid outlet pipe, the buffer base and the beaker are arranged in the thermostatic chamber. The wall surface of the beaker is provided with a liquid level sensor. The control display area comprises a force sensor display screen, a sampling frequency setting button, a pause/start button, a clearing button, a liquid discharge flow rate display screen, a liquid inlet flow rate display screen, a liquid discharge flow rate control button, a liquid inlet flow rate control button, a temperature display screen and a liquid level display screen. And a USB data port is arranged on the side surface of the control display area.
The device for synchronously measuring the surface tension coefficient and the density of the liquid comprises the following steps:
opening the thermostatic chamber, and placing the beaker on the buffer base to reduce the shake of the beaker for a long time; switching on a power supply of the measuring device, and pressing a clearing button after the force sensor display screen, the liquid discharge flow rate display screen, the liquid inlet flow rate display screen, the temperature display screen and the liquid level display screen work normally to clear the high-precision force sensor; adjusting the liquid inlet flow rate control button to enable liquid to be measured to flow in along the wall surface of the beaker, and avoiding the liquid inlet column with overlarge flow rate from touching the metal ring; after the liquid level of the liquid to be measured and the liquid level display screen are observed to determine that the liquid to be measured completely submerges the metal ring, adjusting a liquid inlet flow rate control button to stop injecting liquid into the beaker, standing, and observing the readings of the force sensor display screen, the temperature display screen and the liquid level display screen; after the readings are stable, the liquid discharge flow rate control button is adjusted, the liquid to be measured flows out, and the liquid level gradually descends; adjusting a sampling frequency setting button to clearly observe signal change on a display screen of the force sensor, and keeping the sampling frequency unchanged after the adjustment is finished; then, a pause/start button is pressed to start recording data. At the moment, the force sensor display screen displays a curve that the tensile force F value measured by the high-precision force sensor changes along with time t, the pause/start button is pressed after the metal ring breaks the liquid film to be measured, and the liquid discharge flow rate control button is closed. Exporting data from a USB data port, inputting the data into a computer, drawing a curve of the tension F changing along with time t, establishing a mathematical model, and fitting a curve of two stages by using fitting software; and calculating the surface tension coefficient and the density of the liquid to be measured according to the fitting result.
Compared with the prior art, the invention has the following beneficial effects:
the liquid surface tension coefficient and density synchronous measuring device is simple in structure and easy to process and manufacture, and stress changes in the experimental process are observed in real time through the display screen, so that a user can be helped to deeply understand the physical principle. The device is simple in principle, only the change of the pulling force received by the metal ring along with time needs to be measured, then the metal ring is fitted according to the established physical model, and the density and the surface tension coefficient of the liquid to be measured can be obtained simultaneously through the fitting coefficient. Compared with the device and the method for separately measuring the density or the surface tension coefficient, the method saves the measuring time and reduces the cost.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a device for synchronously measuring surface tension coefficient and density of a liquid according to the present invention.
In the figure 1, a thermostatic chamber 2, a temperature sensor 3, a high-precision force sensor 4, a metal ring 5, a liquid inlet pipe 6, a liquid outlet pipe 7, a buffer base 8, a beaker 9, a liquid level sensor 10, a control display area 11, a force sensor display 12, a sampling frequency setting button 13, a pause/start button 14, a clear button 15, a liquid discharge flow rate display screen 16, a liquid inlet flow rate display screen 17, a liquid discharge flow rate control button 18, a liquid inlet flow rate control button 19, a temperature display screen 20, a liquid level display screen 21 and a USB data port.
Detailed Description
The invention is further illustrated with reference to the accompanying drawings:
as shown in figure 1, the device for synchronously measuring the liquid surface tension coefficient and the density comprises a thermostatic chamber 1 and a control display area 10, wherein the wall surfaces of the periphery of the thermostatic chamber 1 are provided with temperature sensors 2, and the upper wall surface is provided with a high-precision force sensor 3; a metal ring 4, a liquid inlet pipe 5, a liquid outlet pipe 6, a buffer base 7 and a beaker 8 are arranged in the thermostatic chamber 1; the wall surface of the beaker 8 is provided with a liquid level sensor 9. The control display area 10 comprises a force sensor display screen 11, a sampling frequency setting button 12, a pause/start button 13, a clearing button 14, a liquid discharge flow rate display screen 15, a liquid inlet flow rate display screen 16, a liquid discharge flow rate control button 17, a liquid inlet flow rate control button 18, a temperature display screen 19, a liquid level display screen 20 and a USB data port 21 on the side surface of the control display area 10.
The use steps of the device for synchronously measuring the surface tension coefficient and the density of the liquid are as follows:
1) the thermostatic chamber 1 is opened, the beaker 8 is placed on the buffer base 7, the long-time shaking of the beaker 8 is reduced, and the power supply of the measuring device is switched on. After the force sensor display screen 11, the liquid discharge flow rate display screen 15, the liquid inlet flow rate display screen 16, the temperature display screen 19 and the liquid level display screen 20 work normally, the clear button 14 is pressed, so that the high-precision force sensor 3 is cleared; the liquid inlet flow rate control button 18 is adjusted to enable liquid to be measured to flow in along the wall surface of the beaker 8, and at the moment, the liquid inlet column with overlarge flow rate is prevented from touching the metal ring 4; after the liquid level of the liquid to be measured and the liquid level display screen 20 are observed to determine that the metal ring 4 is completely immersed in the liquid to be measured, the liquid injection into the beaker 8 is stopped by adjusting the liquid inlet flow rate control button 18, the beaker is kept stand, and the readings of the force sensor display screen 11, the temperature display screen 19 and the liquid level display screen 20 are observed;
2) the stable back of above-mentioned registration adjusts flowing back flow rate control button 17, and the liquid that awaits measuring flows out, and the liquid level descends gradually, adjusts sampling frequency setting button 12 this moment, makes to observe the signal change clearly on force sensor display screen 11, and it will keep sampling frequency unchangeable to pay attention to the back of adjusting this moment, then presses pause/start button 13, begins to record data. At the moment, the force sensor display screen 11 displays a curve that the high-precision force sensor 3 measures the change of the tension F value along with the time t, the pause/start button 13 is pressed down after the metal ring 4 breaks the liquid film to be measured, and the liquid discharge flow rate control button 17 is closed.
Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to the embodiments. It should be understood by those skilled in the art that various additions, substitutions and substitutions may be made without departing from the spirit and scope of the present invention as defined in the following claims.
Claims (2)
1. A liquid surface tension coefficient and density synchronous measuring device comprises a thermostatic chamber and a control display area; the device is characterized by also comprising temperature sensors arranged on the peripheral wall surfaces of the thermostatic chamber, and high-precision force sensors arranged on the upper wall surface; a metal ring, a liquid inlet pipe, a liquid outlet pipe, a buffer base and a beaker are arranged in the thermostatic chamber; a liquid level sensor is arranged on the wall surface of the beaker; the control display area comprises a force sensor display screen, a sampling frequency setting button, a pause/start button, a clearing button, a liquid discharge flow rate display screen, a liquid inlet flow rate display screen, a liquid discharge flow rate control button, a liquid inlet flow rate control button, a temperature display screen and a liquid level display screen; and controlling a USB data port on the side surface of the display area.
2. A device for synchronously measuring the surface tension coefficient and the density of a liquid by using the device as claimed in claim 1, wherein: a buffer base is arranged in the thermostatic chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922016239.9U CN212872083U (en) | 2019-11-20 | 2019-11-20 | Liquid surface tension coefficient and density synchronous measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922016239.9U CN212872083U (en) | 2019-11-20 | 2019-11-20 | Liquid surface tension coefficient and density synchronous measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113376059A (en) * | 2021-05-11 | 2021-09-10 | 南京航空航天大学 | STM32 singlechip intelligent control-based liquid surface tension meter and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113376059A (en) * | 2021-05-11 | 2021-09-10 | 南京航空航天大学 | STM32 singlechip intelligent control-based liquid surface tension meter and use method thereof |
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