SU1045081A1 - Liquid surface property measuring device - Google Patents

Abstract

1. A DEVICE FOR ENHANCING A SURFACE LIQUID CONTAINING SUBSTITUTES, containing a cyping body, a hydraulic system for forming a drop of test liquid connected to it, and a liquid adhesion sensor, different in that with a chain of obtaining a continuous dependence of surface properties on time, the body is equipped with a removable cover with a calibrated vertical profile with a removable cover with a calibrated vertical setting with a calibrated cover with time, 1. , the upper surface of which is made with the possibility of forming a given contact area of a drop with this surface, and the pressure sensor is fixed under the opening iem, vshopnennym in the lid. 2. The device according to claim 1, which is due to the fact that, in order to obtain a continuous dependence of surface tension on time, the hole in the shaft is filled with a sharp edge. 3. The device according to claim 1, of tpk cha (L, y e e so that, in order to obtain a continuous dependence of the wetting angle on time, the upper surface of the lid is made flat.

Description

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The invention relates to a counter; one can measure the technique, in particular, devices for the intention of physicists to determine the parameters of solutions of surfactants, and can be used for kinematics of surface loading. raiH fluid and wetting angle.

It is known a device for measuring the surface tension of power generation by MeTooj MaKCiDviaJTbHoro in a gas bubble, which is associated with an electric and pneumatic metering circuit, two calibrated calipers and a time for the existence of a disconnected phase, and a pattern with a pattern that is already applied to the pattern, and a pattern that is not applied to the pattern, and a pattern with a pattern that is already applied to the phase of the pattern, which is already applied to the phase of the pattern, which is already applied to the phase of the pattern, which is used by the pattern, it is not necessary to set the pattern and then to apply a pattern to the pattern of the pattern that is not applied to, in a pattern that is, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern with a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern, in a pattern to a pattern from a section to a section of a pattern in a pattern

The inconsistency of the indicated arrangement is the impossibility of obtaining a continuous dependence of the surface tension in time and the uncertainty of the measurement process. This is due to the fact that

Measurement of the specific phase of the existence of the surface of the phase separation should be carried out by a process one after the other: about the gas bubbles from each channel of the device, as well as the confidence of the resultants in time.

It is also known a device for regressing the wetting angle, containing a micrometer and a micro volume cap container, in which the graduated solid material is squeezed out of the studied solid material, and the height of the drop cap is not greater than the maximum, and the maximum height of the drop cap is not the maximum, and the maximum height of the drop is not the most, and calculate the marginal utopia

wettable 2. I

The disadvantage of this device is about

caused by the impossibility of obtaining the dependence of the wetting angle of solutions of surface-active substances from time-1.

The closest to the proposed system is the measurement of the surface properties of the flukes by the measured greatest pressure in the drop of the social index of the chinformation body, combined with it the hyravpical system of formation of the drop and the subsequent operation of the dropping of the body. From a vertical hole in the body, a drop of the investigated capacity is squeezed out and the largest

The main requirement is the formation of a droplet, with the help of which, on the basis of the corresponding analytical dependency, the value of the surface purulent strain of the GB J is calculated.

A disadvantage of the known device is the discreteness of the obtained measurement results over time, due to the fact that the time interval between two successive moments of reaching the maximum crescent in a drop has a finite value.

The purpose of the invention is to provide the possibility of obtaining a continuous dependence of the surface properties of a fluid on time,

The goal is achieved by the fact that, in a device for measuring the surface properties of blinker containing a cylindrical body, a hydraulic system connected to it to form the 1 SPACE of the test liquid and a liquid pressure sensor, the housing has a removable cover with a calibrated vertical hole, which is designed to form a predetermined the contact area of the caps with this surface, and the pressure sensor is fixed under the hole made in the lid.

In order to obtain a continuous dependence of the surface tension on the time, the hole in the roof was made. with sharp, grooved, calibrated edge,

In order to obtain a continuous dependence of the wetting angle on time, the lid is made of a material to be deposited, and the upper surface of the collar is located in the vice horizontal plane.

FIG. 1 shows the schema of the proposed device; in fig. 2 shows the cover of the lid when using a device for measuring surface tension; in fig. 3 - the same, when using the device of the central intention of the wetting angle.

A device for measuring the surface properties of liquids consists of a corpus 1 with a vertical aperture 2, In the lower part of the aperture 2, a membrane strain gauge and a second flow pressure sensor 3 are installed, the outputs of which are connected through connector 4, the gravitational system of droplet formation of a given volume includes a coarse volume indicator a drop consisting of a cylinder 5B of the housing 1, a piston 6 and an aperture 7 connecting the internal cavity of the cylinder 5 with the cavity 2. The exact drop volume includes a calibrated needle 8, a precision emeschenie in the pipe 9 which schestvp carried out using the handle 1D. A cover 11 is installed at the top of the hole 2, which varies depending on the measurement gauge. A calibrated hole 12 is inserted at the top of the lid. Between the body 1 and the cover 11 is installed a separate slot 13. Fastening the cover. 11 to the housing 1 is carried out by means of a ring 14. A micrometer 16 is mounted on the stand 15, and a pivoting horizontal plate 1 made of a material not wetted by the liquid under study. The plane of the bottom surface of the plate 17 coincides with the plane of the sharp edge of the cover 11 (Fig. 2) when measuring surface tension, or with the plane of the upper surface of the cover 11 (Fig. 3) when measuring the wetting angle. The horizontal position of the instrument is made using p. guirovochnyh screws 18 and indicator 1 horizontality. The filling of the hisphalphic system with the tested liquid makes an opening 20, which during the measurement process is plugged with a stopper 21. With the aim of reducing the evaporation rate from the surface of the drop formed, after rotating the plate 17, the lid 22 is measured. The surface properties of the liquid are measured using the proposed device as follows. With the cover 11 removed and the liquid in the absence of the test fluid inside the instrument's hydraulic system, the adjusting screws 18 and the indicator 19 establish the device’s strictly horizontal position. The membrane level of the pressure sensor 3 is measured with a micrometer 16. Close the opening 2 with the lid 11 using the ring 14. Again, using the micrometer 16, measure the level of the exit plane of the flange. 12, and determine the distance from the membrane sensor 3 to the plane of the edge of the calibrated orifice t Fill the test liquid through the hole 20 into the internal cavity of the hydraulic system, and close the hole 20 with the stopper 21. By displacing the piston 6 in the coarse cylinder 5 By dropping the drop to the left, internal ashiness 2 is dropped until a drop meniscus is formed from the calibrated hole 11. By rotating the plate 17 around the stand 15, the drop formed is cut off so as to remove the part of the fluidism that lies beyond the cut plane of the output calibrated opening 12 of the cover 11. Then by precision adjustment of the calibrated needle 8 with the handle 10 left into the inside of the cavity 2 with the test with a hole, above the cut-off plane of the hole 12, form a drop of a strictly specified volume V, which, when measuring the surface tension, the rasters of the cell V / r- - 1, and wetting angle at HsjiepeHioi. k is from the ratio (), where g is the inner radius of the calibrated sharp edge of the outlet 12, d –g is the difference between the densities of the slug in the drop and the surrounding gas, and the surface tension neddkost in le After that, the resulting drop is closed by the lid 22 and continuously measured the pressure in the droplet over the required period of time. By I connecting the second instrument to the connector & Mu 4 The value of the surface tension on the basis of the measured pressure & Neither P, in the case of the cap 11 according to Fig. 2, is calculated using the dependence τ, 0.5793-0.2256 -pj, 0132-1 obtained by solving on a computer a system of equations describing the shape of the drop surface at V f g 1, Value- wetting angle 0 at the basis of the measured pressure P in the case of a cap 11 in accordance with FIG. 3 is calculated using the dependence e oirco5 p + (-1-P) (o, 52f4-0,2464P4 -Y, 2269P, PAjfl where P; - / - 0.5141 The device allows you to measure the edges of wetting as more is less than 90 °, however, the value of 6 is not constant during the measurement,

Thus | on the basis of continuously measured pressure in icaime, as well as the most significant 4-g, G of d-d, with the help of a pre-assembled device, it is possible to continuously adjust the tension

It is the edge of the wetting of clean liquid and solutions of surface-active substances from time to time, which increases the information content of measurements and the possibility of automagizing them.

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Claims (3)

1. DEVICE FOR MEASURING SURFACE PROPERTIES OF LIQUIDS, comprising a cylindrical body, a hydraulic system for generating a drop of a test liquid and a liquid pressure sensor connected to it, characterized in that in order to obtain a continuous dependence of surface properties on time, the body is equipped with a removable cover with a calibrated vertical hole, '' the upper surface of which is made with the possibility of forming a predetermined area of contact of the drop with this surface, and the pressure sensor is fixed under the hole Formed in the cap .. 2. The device according to π, 1, with the fact that, with the chain for obtaining a continuous dependence of surface tension on time, the hole in the lid is made with a sharp edge. 3. The device according to π. 1, and with the fact that, with the chain of obtaining a continuous dependence of the contact angle of wetting on time, the upper surface of the lid is made flat.