CN108872016B - Liquid dynamic viscosity measuring platform based on electroosmosis principle - Google Patents
Liquid dynamic viscosity measuring platform based on electroosmosis principle Download PDFInfo
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- CN108872016B CN108872016B CN201810769980.XA CN201810769980A CN108872016B CN 108872016 B CN108872016 B CN 108872016B CN 201810769980 A CN201810769980 A CN 201810769980A CN 108872016 B CN108872016 B CN 108872016B
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
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Abstract
The invention discloses a liquid dynamic viscosity measuring platform based on an electroosmosis principle, which comprises a box body, two adjustable infrared light sources, a first power supply polar plate, a second power supply polar plate, an experiment bracket and an electroosmosis tube, wherein the box body is provided with a first infrared light source and a second infrared light source; the box body is a rectangular box body, and a movable box cover is arranged above the box body; the experimental bracket is arranged in the middle of the box body along the long edge direction, and the upper part of the experimental bracket supports the electroosmosis tube; the two adjustable infrared light sources are respectively arranged on the front side and the rear side of the experimental bracket along the long edge direction; the first power supply polar plate and the second power supply polar plate are respectively arranged at the left side and the right side of the experiment bracket; the two adjustable infrared light sources, the first power supply polar plate and the second power supply polar plate are connected by leads and led out of the box body through wire holes on the side of the box; the experimental support is composed of two support legs and a scale bar, wherein the support legs are provided with semicircular gaps, and patch thermocouples are adhered inside the semicircular gaps; the electroosmotic tube is arranged on the patch thermocouple in the semicircular notch. The invention has the advantages of simple structure, convenient operation and high accuracy, and can give the characteristic of the liquid viscosity changing along with time.
Description
Technical Field
The invention belongs to the field of fluid measurement, relates to a fluid dynamic viscosity measurement platform, and particularly relates to a liquid dynamic viscosity measurement platform based on an electroosmosis principle.
Background
Viscosity is one of the important physical properties of fluids, which reflects the behavior of liquid flow, and is an important standard feature in the food, petroleum and other industries. Measuring the viscosity and fluidity of fluids is of great importance in industrial production and basic research. At present, methods for measuring the viscosity of a fluid include a capillary method, a sedimentation method, a rotation method, a vibration method, and the like. Many industrial enterprises require different viscosity grades for different types of viscous liquids used in different applications. Some of the measurement can be carried out at normal temperature, but some measurement has use value only when the measurement is carried out at high temperature. The viscosity is greatly influenced by the temperature, and the conventional viscosity measurement means measures the viscosity at a single temperature and cannot obtain the characteristic that the viscosity of the liquid changes along with the temperature.
Electroosmosis is one of the electrokinetic phenomena, which refers to the phenomenon in which a liquid moves relative to a stationary solid phase in contact with it under the action of an electric field. Generally, the solution will move in a certain direction under the action of an electric field. Electroosmosis is generally used in electroosmosis technology, and is commonly used in industry to enhance fluid mixing in a micro flow channel, drive out moisture in products, prepare porous media materials, control liquid film movement in biochips, and other practical applications.
Because the viscosity of the liquid is related to the temperature, most of the existing methods for measuring the viscosity of the liquid can only measure the viscosity at a single temperature, so the experimental device can measure the change characteristic of the viscosity of the liquid along with the temperature by utilizing the electroosmosis principle and combining the infrared heating technology. The measuring method of the device is a viscosity measuring method which is convenient to operate, economical and reliable, and provides guiding significance for solving different liquid viscosities at different temperatures.
Disclosure of Invention
The invention overcomes the defects in the prior art, and aims to provide the liquid dynamic viscosity measuring platform based on the electroosmosis principle.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid dynamic viscosity measuring platform based on an electroosmosis principle comprises a box body, two adjustable infrared light sources, a first power supply polar plate, a second power supply polar plate, an experiment support and an electroosmosis tube; the box body is a rectangular box body made of insulating materials, and a movable box cover is arranged above the box body; the experimental support is arranged in the middle of the box body along the long edge direction, and the electroosmosis tube is supported at the upper part of the experimental support; the two adjustable infrared light sources are respectively arranged on the front side and the rear side of the experiment bracket along the long edge direction; the first power supply polar plate and the second power supply polar plate are respectively arranged on the left side and the right side of the experiment bracket; the two adjustable infrared light sources, the first power supply polar plate and the second power supply polar plate are connected by leads and led out of the box body through wire holes on the side of the box;
the experimental support is composed of two support legs and a scale bar, wherein the scale bar takes 5 mm as an interval scale; a semicircular notch is formed in the middle of the upper end of the support leg, and a patch thermocouple is adhered to the inside of the semicircular notch; the electroosmotic tube is arranged on the patch thermocouple in the semicircular notch; a rectangular through hole is formed in the lower portion of the semicircular notch, and two ends of the scale bar are inserted into the rectangular through hole; the patch thermocouples are connected by leads and led out of the box body through wire holes on the side of the box.
Furthermore, the electroosmosis tube is a micro-fluid pipeline and is a siphon made of glass materials, the middle of the siphon is a pipeline with the diameter of 0.1-0.5 mm, and liquid drops of liquid to be detected are filled in the pipeline in the test.
Furthermore, the case lid is transparent glass material, just the cross-section of case lid presents the convex lens shape to play the effect of magnifying glass, be convenient for the observation of liquid and scale.
Compared with the prior art, the invention has the following advantages: simple structure, convenient operation, accuracy height can give the liquid viscosity characteristic of changing over time.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3(a) is a top view of the experimental scaffold, (b) is a front view of the experimental scaffold and (c) is a side view of the experimental scaffold;
FIG. 4 is a view showing the structure of an electroosmosis test tube;
FIG. 5 is a schematic front view of the cover (a) and a schematic side view of the cover (b);
fig. 6 is a schematic diagram of the working principle of the present invention.
Reference numerals: 1-an experiment box body, 2-a box cover, 3-an adjustable infrared light source, 4-a power supply pole plate A, 5-an experiment support, 6-an electroosmotic tube, 7-a power supply pole plate B, 1-1-a wire hole, 5-1-a support foot, 5-2-a scale bar, 5-3-a patch thermocouple, 5-3-1-a thermocouple lead, 6-1-a siphon and 6-2-liquid drops.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the invention discloses a liquid dynamic viscosity measuring platform based on an electroosmosis principle, which comprises a box body 1, two adjustable infrared light sources 3, a first power supply pole plate 4, a second power supply pole plate 7, an experiment bracket 5 and an electroosmosis tube 6, wherein the box body is provided with a plurality of adjustable infrared light sources; the box body 1 is a rectangular box body made of insulating materials, and a movable box cover 2 is arranged above the box body; the experimental support 5 is arranged in the middle of the box body 1 along the long edge direction, and the electroosmosis tube 6 is supported at the upper part of the experimental support 5; the two adjustable infrared light sources 3 are respectively arranged on the front side and the rear side of the experiment bracket 5 along the long edge direction; the first power supply polar plate 4 and the second power supply polar plate 7 are respectively arranged at the left side and the right side of the experiment bracket 5; the two adjustable infrared light sources 3, the first power supply polar plate 4 and the second power supply polar plate 7 are connected by leads and led out of the box body 1 through a wire hole 1-1 on the side of the box;
as shown in (a), (b) and (c) of fig. 3, the experimental support 5 is composed of two support legs 5-1 and a scale bar 5-2, and the scale bar 5-2 is a scale with 5 mm as an interval, as shown in fig. 3 (a); a semicircular notch is formed in the middle of the upper end of the support leg 5-1, and as shown in fig. 3(c), a patch thermocouple 5-3 is adhered to the inside of the semicircular notch 5-3; the electroosmotic tube 3 is arranged on a patch thermocouple 5-3 in the semicircular notch; a rectangular through hole is formed in the lower portion of the semicircular gap, and two ends of the scale bar 5-2 are inserted into the rectangular through hole as shown in fig. 3 (b); the patch thermocouples 5-3 are connected by leads 5-3-1 and led out of the box body 1 through wire holes 1-1 on the side of the box;
as shown in FIG. 4, the electroosmotic tube 3 is a microfluidic pipeline and is a siphon made of glass material, the middle of the siphon 6-1 is a pipeline with the diameter of 0.1-0.5 mm, and liquid drops 6-2 of liquid to be detected are filled in the pipeline in the test.
As shown in fig. 5 (a) and (b), the cover 2 is made of transparent glass material, and the cross section of the cover 2 is in the shape of a convex lens, as shown in fig. 5(b), so as to function as a magnifying glass for facilitating the observation of liquid and scales.
Working principle of the invention
Electroosmosis is the phenomenon in which droplet particles move under the influence of a magnetic field. According to the existing research, under the condition of existence of a sinusoidal electric field, the moving speed expression of micro-liquid on the wall surface is as follows:
wherein the content of the first and second substances,ris the dielectric constant of a liquid, ζ0The zeta potential of the wall surface is-0.1V, η is the dynamic viscosity of the liquid, and E is the amplitude of the tangential electric field.
Integrating equation (1) over a half-period yields:
then there are:
the invention uses the electroosmosis principle as shown in figure 6, a sinusoidal alternating current voltage is loaded on a first power supply pole plate and a second power supply pole plate, so that an alternating electric field is formed in the electroosmosis tube, the wall surface speed of liquid drops shows sinusoidal change under the action of the electric field, the liquid drops are driven to reciprocate in a siphon tube, according to the formula (2),rand ζ0For known physical parameters, the electric field intensity E can be obtained by the voltage amplitude applied to the first power supply plate and the second power supply plate, and S is the maximum distance for the droplet to move. In the experiment, the distance S between the left pole position and the right pole position of the liquid drop can be obtained by observing the scales of the left pole position and the right pole position of the liquid drop, so that the dynamic viscosity coefficient of the liquid is obtained by calculation.
The method of use of the invention is illustrated below:
before measurement, liquid to be measured is firstly introduced into a siphon shown in fig. 4, liquid drops are moved to a position close to the middle in the siphon in a suction mode and the like, then the electroosmosis tube is placed on an experiment support, low-frequency alternating voltage is added between a first power supply pole plate and a second power supply pole plate, the voltage frequency is 0.1-0.2 Hz, the voltage amplitude is gradually increased from 0, the moving condition of the liquid drops is observed through a box cover, and scales corresponding to the left pole position and the right pole position of the liquid drop moving are checked. The two are selected to have a difference of 10 graduation lines, the maximum displacement of the liquid drop movement is 5 cm, and S is 5 cm. Recording the voltage amplitude loaded on the power supply plate A and the power supply plate B under the condition, and adopting the voltage amplitudeThe value is divided by the distance between the two plates to obtain the electric field intensity amplitude E at this time. The dielectric constants of S, E and the liquid dropletrAnd substituting the formula (2) to obtain the dynamic viscosity coefficient of the liquid. And further measuring the temperature of the electroosmosis tube at the moment according to the patch thermocouple lead-out wire to obtain the viscosity coefficient of the liquid at the temperature.
Starting the adjustable infrared light source under the condition of keeping the alternating voltage unchanged, firstly adopting lower heating power, measuring the temperature change of the electroosmosis tube through the thermocouple, and recording the temperature value after the temperature is stable. And (3) obtaining the maximum displacement S of the movement of the liquid drop through the scales corresponding to the left extreme position and the right extreme position of the movement of the liquid drop, and calculating the dynamic viscosity coefficient of the liquid at the temperature according to the formula (2).
Gradually increasing the power of the adjustable infrared light source, repeating the steps to obtain the dynamic viscosity coefficients of the liquid at different temperatures, and finally obtaining the temperature-dependent change characteristic of the viscosity of the liquid.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (2)
1. A liquid dynamic viscosity measuring platform based on electroosmosis principle is characterized in that: the device comprises a box body, two adjustable infrared light sources, a first power supply polar plate, a second power supply polar plate, an experiment support and an electroosmosis tube; the box body is a rectangular box body made of insulating materials, and a movable box cover is arranged above the box body; the experimental support is arranged in the middle of the box body along the long edge direction, and the electroosmosis tube is supported at the upper part of the experimental support; the two adjustable infrared light sources are respectively arranged on the front side and the rear side of the experiment bracket along the long edge direction; the first power supply polar plate and the second power supply polar plate are respectively arranged on the left side and the right side of the experiment bracket; the two adjustable infrared light sources, the first power supply polar plate and the second power supply polar plate are connected by leads and led out of the box body through wire holes on the side of the box;
the experimental support is composed of two support legs and a scale bar, wherein the scale bar takes 5 mm as an interval scale; a semicircular notch is formed in the middle of the upper end of the support leg, and a patch thermocouple is adhered to the inside of the semicircular notch; the electroosmotic tube is arranged on the patch thermocouple in the semicircular notch; a rectangular through hole is formed in the lower portion of the semicircular notch, and two ends of the scale bar are inserted into the rectangular through hole; the patch thermocouples are connected by leads and led out of the box body through wire holes on the side of the box;
the electroosmosis tube is a microfluid pipeline and is a siphon made of glass materials, the middle of the siphon is a pipeline with the diameter of 0.1-0.5 mm, and liquid drops of liquid to be detected are filled in the pipeline in the test.
2. The electroosmotic-principle-based liquid dynamic viscosity measurement platform of claim 1, wherein: the case lid is transparent glass material, and the cross-section of case lid presents convex lens shape.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033879A (en) * | 1987-10-07 | 1989-07-12 | 中国科学院长春应用化学研究所 | Electrical viscosimeter |
| US5301540A (en) * | 1993-05-17 | 1994-04-12 | Wlodzimierz Pilacinski | Probe for measuring the viscosity of liquids |
| EP1072879A2 (en) * | 1999-07-26 | 2001-01-31 | Alvise Cortinovis | Method and equipment for the determination of general and capillary viscosity of blood |
| CN101303288A (en) * | 2008-03-05 | 2008-11-12 | 东华大学 | Device and method for on-line detecting serum viscosity using capillary tube method |
| JP2009042100A (en) * | 2007-08-09 | 2009-02-26 | National Institute Of Advanced Industrial & Technology | Viscosity measuring method |
| DE102008031772A1 (en) * | 2008-07-04 | 2010-01-14 | Continental Automotive Gmbh | Device for measuring viscosity and thickness of fluids, has bending vibration with carrier tongue, and two electrodes, which are connected with piezo-ceramic |
| CN102590033A (en) * | 2012-01-18 | 2012-07-18 | 浙江大学 | Device for measuring flow characteristics and electrokinetic parameters of ionic liquid solution micropipe |
| CN102944500A (en) * | 2012-11-07 | 2013-02-27 | 重庆大学 | Passageway device and system for detecting viscosity of liquid as well as application thereof |
| CN105932151A (en) * | 2016-05-17 | 2016-09-07 | 湖北大学 | Micro-fluidic chip for viscosity testing, and preparation method |
| CN107941657A (en) * | 2017-11-29 | 2018-04-20 | 陕西易阳科技有限公司 | A kind of liquid viscosity measuring system |
-
2018
- 2018-07-13 CN CN201810769980.XA patent/CN108872016B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033879A (en) * | 1987-10-07 | 1989-07-12 | 中国科学院长春应用化学研究所 | Electrical viscosimeter |
| US5301540A (en) * | 1993-05-17 | 1994-04-12 | Wlodzimierz Pilacinski | Probe for measuring the viscosity of liquids |
| EP1072879A2 (en) * | 1999-07-26 | 2001-01-31 | Alvise Cortinovis | Method and equipment for the determination of general and capillary viscosity of blood |
| JP2009042100A (en) * | 2007-08-09 | 2009-02-26 | National Institute Of Advanced Industrial & Technology | Viscosity measuring method |
| CN101303288A (en) * | 2008-03-05 | 2008-11-12 | 东华大学 | Device and method for on-line detecting serum viscosity using capillary tube method |
| DE102008031772A1 (en) * | 2008-07-04 | 2010-01-14 | Continental Automotive Gmbh | Device for measuring viscosity and thickness of fluids, has bending vibration with carrier tongue, and two electrodes, which are connected with piezo-ceramic |
| CN102590033A (en) * | 2012-01-18 | 2012-07-18 | 浙江大学 | Device for measuring flow characteristics and electrokinetic parameters of ionic liquid solution micropipe |
| CN102944500A (en) * | 2012-11-07 | 2013-02-27 | 重庆大学 | Passageway device and system for detecting viscosity of liquid as well as application thereof |
| CN105932151A (en) * | 2016-05-17 | 2016-09-07 | 湖北大学 | Micro-fluidic chip for viscosity testing, and preparation method |
| CN107941657A (en) * | 2017-11-29 | 2018-04-20 | 陕西易阳科技有限公司 | A kind of liquid viscosity measuring system |
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