CN112710587A - Cone plate rotary type high-viscosity non-Newtonian fluid viscometer and viscosity detection method - Google Patents
Cone plate rotary type high-viscosity non-Newtonian fluid viscometer and viscosity detection method Download PDFInfo
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- CN112710587A CN112710587A CN202011537169.2A CN202011537169A CN112710587A CN 112710587 A CN112710587 A CN 112710587A CN 202011537169 A CN202011537169 A CN 202011537169A CN 112710587 A CN112710587 A CN 112710587A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/0026—Investigating specific flow properties of non-Newtonian fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/006—Determining flow properties indirectly by measuring other parameters of the system
- G01N2011/008—Determining flow properties indirectly by measuring other parameters of the system optical properties
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Abstract
The invention discloses a conical plate rotating type high-viscosity non-Newtonian fluid viscometer and a viscosity detection method, wherein the conical plate rotating type high-viscosity non-Newtonian fluid viscometer comprises a support, wherein a rotating platform and a stator are fixed on the support, the stator is positioned above the rotating platform, the rotating platform is used for placing non-Newtonian fluid, the conical plate rotating type high-viscosity non-Newtonian fluid viscometer also comprises an elastic hollow cylinder, the top of the elastic hollow cylinder is connected with the support, the bottom of the elastic hollow cylinder is connected with the stator, a torque measurement grating is arranged on the elastic hollow cylinder, the torque measurement grating is connected with an optical fiber, the optical fiber is coupled with an FB; a temperature sensor is arranged on the working surface of the stator, and a rotating speed sensor is arranged on the rotating platform; the temperature sensor and the rotating speed sensor are connected with the controller.
Description
Technical Field
The invention discloses a cone plate rotary type high-viscosity non-Newtonian fluid viscometer and a viscosity detection method.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
non-Newtonian fluids are widely used in chemical, food and biomedical fields, such as blood, aviation engine fuel, edible oil, flour, etc. Therefore, the method is particularly important for detecting the viscosity of the non-Newtonian fluid. At present, the main flow of the non-Newtonian fluid viscosity detection method is a rotation method, a capillary method, a falling ball vibration method and the like, wherein the rotation method is most commonly used due to the characteristics of simple and convenient use, accurate measurement and high reproducibility.
The principle of the rotary non-Newtonian fluid viscometer is that when relative motion occurs between a fluid and an adjacent object, the object can be subjected to a resisting moment of the fluid, so that the torque or the rotating speed of the object is changed, and the viscosity of the fluid can be determined according to the change of the torque and the rotating speed. The traditional rotation method structure is mostly in a cylinder type, and the main reasons influencing the measurement accuracy of the cylinder type non-Newtonian fluid viscometer are as follows: shear heat, wherein the rotating fluid continuously rotates on the surface of the measuring object to generate heat which has a great relationship with viscosity to influence the measuring precision; the edge effect is called as the edge effect, and the additional viscous moment generated between the fluid and the contact object, especially in the non-Newtonian fluid, the edge effect has a large influence on the measurement accuracy; and the problems of small detection range and overlarge dosage of the fluid reagent generally exist. Therefore, the cone-plate rotating type high-viscosity non-Newtonian fluid viscometer is designed, and the cone-plate stator can effectively solve the edge effect, reduce the generation of shear heat and reduce the dosage of a fluid reagent, so that the cone-plate rotating type high-viscosity non-Newtonian fluid viscometer is more suitable for detecting the viscosity of the non-Newtonian fluid.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention discloses a conical plate rotary type high-viscosity non-Newtonian fluid viscometer.
The technical scheme adopted by the invention is as follows:
the invention provides a conical plate rotating type high-viscosity non-Newtonian fluid viscometer which comprises a support, wherein a rotating table and a stator are fixed on the support, the stator is positioned above the rotating table, the rotating table is used for holding non-Newtonian liquid, the conical plate rotating type high-viscosity non-Newtonian fluid viscometer also comprises an elastic hollow cylinder, the top of the elastic hollow cylinder is connected with the support, the bottom of the elastic hollow cylinder is connected with the stator, a torque measurement grating is arranged on the elastic hollow cylinder, the torque measurement grating is connected with an optical fiber, the optical fiber is coupled with an FBGA demodulation module through a coupler, and the FBGA demodulation module is connected with an upper computer; a temperature sensor is arranged on the working surface of the stator, and a rotating speed sensor is arranged on the rotating platform; and the temperature sensor and the rotating speed sensor are connected with the controller.
In a second aspect, the present invention is based on the cone-plate rotating high-viscosity non-newtonian fluid viscometer, and further provides a viscosity detection method for the cone-plate rotating high-viscosity non-newtonian fluid viscometer, which comprises the following steps:
firstly, dripping non-Newtonian fluid to be measured into a rotating platform, immersing a stator, starting a temperature sensor on the stator to detect the temperature of the fluid, starting a motor when the temperature reaches a rated temperature, starting the rotating platform to rotate, and measuring the rotating speed by a rotating speed sensor; the rotating table drives the non-Newtonian fluid to rotate in the rotating process, so as to drive the stator to rotate along the central shaft, and the elastic hollow cylinder connected above the stator also rotates along with the stator; the torque measuring grating detects torque information, the optical fiber is coupled with the FBGA demodulation module through the coupler, and the FBGA demodulation module is connected with an upper computer to finish torque information uploading and information processing; when the rotating speed reaches the rated rotating speed, starting to record a torque value, processing by an upper computer and carrying out nonlinear compensation to obtain a viscosity value, and displaying on the upper computer; if the viscosity of the non-Newtonian fluid exceeds the measurement range of the viscometer, an alarm is triggered.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
1. the viscometer disclosed by the invention adopts the Fiber Bragg Grating (FBG) as a sensing element, and has the advantages of high precision, electromagnetic interference resistance, corrosion resistance, acid and alkali resistance, explosion resistance, flame resistance and the like.
2. The design of the viscometer is carried out based on a rotation method, and the method is particularly suitable for non-Newtonian fluids, and has the advantages of simple and convenient use, accurate measurement and high reproducibility.
3. The single chip microcomputer system is used for automatically acquiring, processing and displaying information, and the on-line detection of the viscosity is realized.
4. The conical plate type stator is used, the edge effect can be effectively solved, the generation of shear heat is reduced, the using amount of a fluid reagent is reduced, and the non-Newtonian fluid viscosity detection device is more suitable for detecting the viscosity of non-Newtonian fluid.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a general block diagram of the system of the present invention;
FIG. 2 is a schematic view of the overall structure of the present invention;
FIG. 3 is a partial schematic view of FIG. 2 of the present invention;
in the figure: the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only. 1. The device comprises a fastening nut, 2. a rectangular support, 3. a rectangular base, 4. a cylindrical support, 5. a flange, 6. a torsion measuring grating, 7. an elastic hollow cylinder, 8. a cylindrical support, 9. a conical stator, 10. a temperature sensor, 11. an electric rotating platform and 12. a rotating speed sensor.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described in the background of the invention, the prior art has the defects, and in order to solve the technical problems, the invention provides a conical plate rotating type high-viscosity non-Newtonian fluid viscometer.
In a typical embodiment of the present invention, as shown in fig. 3, the conical plate rotary high-viscosity non-newtonian fluid viscometer provided by the present invention comprises a horizontally disposed rectangular base 3 and a vertically disposed rectangular support 2, wherein the rectangular support 2 is mounted on the rectangular base 3, an electric rotary table 11 is disposed on the top of the rectangular support 2, a horizontal rod is disposed on the rectangular support 2, the bottom of the horizontal rod is connected to the top of an elastic hollow cylinder 7 through a flange, and the bottom of the elastic hollow cylinder 7 is connected to a conical stator 9 through a flange; the elastic hollow cylinder 7 is provided with a torsion measuring grating 6, the torsion measuring grating 6 is connected with an optical fiber, the optical fiber is coupled with an FBGA demodulation module through a coupler, and the FBGA demodulation module is connected with an upper computer.
The conical stator 9 on be equipped with temperature sensor 10 electric rotating platform 11 on be equipped with speed sensor 12, temperature sensor 10, speed sensor 12 link to each other with the AD converter, the AD converter link to each other with the controller, the controller with host computer communication.
Further, the electric rotating table 11 in this embodiment is a lower motor-carrying part, the lower part rotates, the liquid is discharged in the middle, the upper stator deflects due to the liquid, and then the grating obtains the torque according to the deflection of the stator.
Specifically, the viscometer sensing structure is composed of a sensing element, a transduction structure and a contact part, the embodiment adopts an FBG (torsion grating) as the sensing element, and the viscosity value is reflected by Bragg wavelength shift; an elastic hollow cylinder 7 is used as a key transduction structure, and a torsion measurement grating is adhered to the inner wall of the elastic hollow cylinder 7; specifically, the torsion measuring grating is vertically adhered to the inner wall of the elastic hollow cylinder 7, the distance between the torsion measuring grating and the upper flange and the distance between the torsion measuring grating and the lower flange are the same, and torque measurement is carried out according to the change of the torsion measuring grating in the viscosity detection process.
The physical structure of the contacting part, i.e. the stator, is selected according to the actual contacting environment. The stator is divided into two types, one is ordinary carbon steel, and the other is high-precision corrosion-resistant stainless steel.
The sensing structure can obtain different torsional strain conditions caused by the change of the viscosity value of the liquid.
The electric rotating table 11 in the rotating method is classified into various types according to different detection systems, such as an axial cylinder type, a flat type, a conical plate type, and the like, because the accuracy of the measurement of the non-newtonian fluid by the axial cylinder type is affected by a gap distance and the like, and the constitutive equation of the non-newtonian fluid is unknown and is not easy to obtain. The cone plate type is characterized in that the shear stress, the shear rate and the viscosity of any position in a gap formed between the cone and the flat plate are independent of the radial position and the axial position, and the cone plate type is very suitable for measuring the viscosity of non-Newtonian fluid. A conical tip is attached to the lower end of a cylindrical stator, and a viscosity detection platform is improved from a coaxial cylindrical type to a conical plate type.
The overall frame of the viscometer system is shown in fig. 1 and mainly comprises six modules, namely an FBG torque detection module, a temperature measurement module, a rotating speed detection module, a main control board module, a power supply module and a liquid crystal display module. The main control board module is a sensor control center and is responsible for controlling and calling each module, and is also a sensor data acquisition and processing center and is responsible for acquiring data of the torque, temperature and rotating speed detection module and calculating viscosity information, sending an instruction to the display module, displaying measurement results of the temperature, the rotating speed, the viscosity and the like on the liquid crystal display screen, and judging whether to send a viscosity alarm instruction.
The method for detecting the viscosity by using the viscometer system comprises the following steps:
firstly, the non-Newtonian fluid to be measured is dripped into the electric rotating platform, the stator is immersed, the temperature sensor on the stator starts to detect the temperature of the fluid at the moment, when the temperature reaches the rated temperature, the motor is started, the electric rotating platform starts to rotate, and the rotating speed is measured by the rotating speed sensor. Because of the existence of frictional force, electric rotating platform can drive non-Newtonian fluid at rotatory in-process and rotate, and then drives the stator and take place to rotate along the center pin, and the hollow cylinder of elasticity that the stator top is connected also rotates thereupon, installs on the hollow cylinder of elasticity and surveys and turn round the grating, can detect moment of torsion information. The optical fiber is coupled with the FBGA demodulation module through the coupler, and the FBGA demodulation module is connected with the upper computer to finish torque information uploading and information processing. And when the rotating speed reaches the rated rotating speed, starting to record a torque value, processing by an upper computer and carrying out nonlinear compensation to obtain a viscosity value, and displaying on the upper computer. If the viscosity of the non-Newtonian fluid exceeds the measurement range of the viscometer, an alarm is triggered.
The invention adopts a Lagrange linear interpolation method to compensate the nonlinear error in the viscosity detection process and improve the precision.
In the viscosity measurement process, due to the fact that the structure of a viscometer, environmental factors, a measurement model and the like can generate nonlinear errors, the method adopts a Lagrange linear interpolation method to compensate the nonlinear errors in the viscosity measurement process, and the accuracy of results is guaranteed.
A nonlinear compensation model of a Lagrange linear interpolation method:
first assume an interval xk,xk+1]The end point values of the interval are respectively as follows: y isk＝f(xk)，yk+1＝f(xk+1) Then linear interpolation polynomial L1(x) Satisfies the following conditions: l is1(x)＝yk，L1(xk+1)＝yk+1。y＝L1(x) The expression of (c) can be expressed as:
the formulas 1-1 and 1-2 are two expression modes of Lagrange method, namely a point-diagonal formula and a two-point formula. The pre-compensation data of the viscometer is taken as input in the formula, namely (x)k,yk) (ii) a The data measured by the standard viscometer is used as output, namely (x)k+1,yk+1) Then, the Lagrange linear model can be solved through the formulas (1-1) and (1-2) to obtain the target polynomial L1(x) The method is used for compensating the non-linearity error of the viscosity of the non-Newtonian fluid.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The cone plate rotating type high-viscosity non-Newtonian fluid viscometer is characterized by further comprising an elastic hollow cylinder, wherein the top of the elastic hollow cylinder is connected with the support, the bottom of the elastic hollow cylinder is connected with the stator, a torque measuring grating is mounted on the elastic hollow cylinder, the torque measuring grating is connected with an optical fiber, the optical fiber is coupled with an FBGA demodulation module through a coupler, and the FBGA demodulation module is connected with an upper computer; a temperature sensor is arranged on the working surface of the stator, and a rotating speed sensor is arranged on the rotating platform; the temperature sensor and the rotating speed sensor are connected with the controller, the controller is communicated with the upper computer, and the controller controls the rotating platform.
2. The cone plate rotating high viscosity non-newtonian fluid viscometer of claim 1 in which the lower end of the stator is conical.
3. The cone plate rotating high viscosity non-newtonian fluid viscometer of claim 1 in which the torsion grating is affixed to the inside wall of the elastic hollow cylinder.
4. The cone plate rotary high viscosity non-newtonian fluid viscometer of claim 3 in which the torque measurement grating is centered on the interior wall in the elevation direction.
5. The cone and plate rotating high viscosity non-newtonian fluid viscometer of claim 1 in which the rotating table is rotated by a motor controller, the motor being connected to the controller.
6. The cone plate rotary high-viscosity non-Newtonian fluid viscometer of claim 1 in which said host computer is connected to an alarm device.
7. The method for measuring viscosity of a cone-plate rotary high-viscosity non-Newtonian fluid viscometer of claim 1,
firstly, dripping non-Newtonian fluid to be measured into a rotating platform, immersing a stator, starting a temperature sensor on the stator to detect the temperature of the fluid, starting a motor when the temperature reaches a rated temperature, starting the rotating platform to rotate, and measuring the rotating speed by a rotating speed sensor; the rotating table drives the non-Newtonian fluid to rotate in the rotating process, so as to drive the stator to rotate along the central shaft, and the elastic hollow cylinder connected above the stator also rotates along with the stator; the torque measuring grating detects torque information, the optical fiber is coupled with the FBGA demodulation module through the coupler, and the FBGA demodulation module is connected with an upper computer to finish torque information uploading and information processing; when the rotating speed reaches the rated rotating speed, starting to record a torque value, processing by an upper computer and carrying out nonlinear compensation to obtain a viscosity value, and displaying on the upper computer; if the viscosity of the non-Newtonian fluid exceeds the measurement range of the viscometer, an alarm is triggered.
8. The method for measuring the viscosity of a cone-plate rotary high-viscosity non-Newtonian fluid viscometer of claim 1, wherein Lagrangian linear interpolation is used to compensate for non-linear errors in the viscosity measurement process.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011537169.2A CN112710587A (en) | 2020-12-23 | 2020-12-23 | Cone plate rotary type high-viscosity non-Newtonian fluid viscometer and viscosity detection method |
| BE20215348A BE1027878B1 (en) | 2020-12-23 | 2021-04-30 | Rotary conical plate viscometer for high viscosity non-Newtonian fluids and method for detecting viscosity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011537169.2A CN112710587A (en) | 2020-12-23 | 2020-12-23 | Cone plate rotary type high-viscosity non-Newtonian fluid viscometer and viscosity detection method |
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| CN112710587A true CN112710587A (en) | 2021-04-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340631A (en) * | 2021-05-17 | 2021-09-03 | 西安交通大学 | Torsional vibration testing device and signal analysis method |
| CN116983865A (en) * | 2023-09-28 | 2023-11-03 | 成都理工大学 | Thickening device and method for realizing uniform solidification of liquid and particle solidified plugging material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340631A (en) * | 2021-05-17 | 2021-09-03 | 西安交通大学 | Torsional vibration testing device and signal analysis method |
| CN113340631B (en) * | 2021-05-17 | 2024-05-24 | 西安交通大学 | Torsional vibration testing device and signal analysis method |
| CN116983865A (en) * | 2023-09-28 | 2023-11-03 | 成都理工大学 | Thickening device and method for realizing uniform solidification of liquid and particle solidified plugging material |
| CN116983865B (en) * | 2023-09-28 | 2023-12-19 | 成都理工大学 | Thickening device and method for realizing uniform solidification of liquid and particle solidified plugging material |
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| Publication number | Publication date |
|---|---|
| BE1027878B1 (en) | 2022-04-19 |
| BE1027878A1 (en) | 2021-07-12 |
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