CN112577853B - Method for measuring viscosity of magnetic liquid - Google Patents
Method for measuring viscosity of magnetic liquid Download PDFInfo
- Publication number
- CN112577853B CN112577853B CN202110214981.XA CN202110214981A CN112577853B CN 112577853 B CN112577853 B CN 112577853B CN 202110214981 A CN202110214981 A CN 202110214981A CN 112577853 B CN112577853 B CN 112577853B
- Authority
- CN
- China
- Prior art keywords
- magnetic
- viscometer
- magnetic liquid
- viscosity
- inductance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses a method for measuring the viscosity of magnetic liquid, wherein two ends of a viscometer are respectively connected in series on a magnetic liquid circulating loop, a cable of the viscometer is electrically connected with an inductance tester, the inside of the viscometer is of a hollow structure, the magnetic liquid flows through the inside of the viscometer, when the viscosity of the flowing magnetic liquid changes, the inductance values at the two ends of the viscometer also correspondingly change, the inductance values at the two ends of the viscometer and the viscosity of the magnetic liquid flowing through the inside of the viscometer are in a linear relation, and real-time data are transmitted to a control system for further analysis and processing through the connection of the inductance tester and a serial bus. The invention has simple structure, high measurement precision and stable data, does not influence the stability of the components and the flow of the magnetic liquid, and is easy to clean and maintain.
Description
Technical Field
The invention relates to the technical field of viscosity measurement of magnetic liquid, in particular to a method for measuring the viscosity of the magnetic liquid.
Background
The magnetic liquid is also called magnetic fluid, ferromagnetic fluid or magnetic liquid, is a novel functional material, and has the liquidity of liquid and the magnetism of solid magnetic material. The colloidal liquid is a stable colloidal liquid formed by mixing magnetic solid particles with the diameter of nanometer level (below 10 nanometers), base carrier liquid (also called medium) and a surfactant. The fluid has no magnetic attraction in a static state, and shows magnetism under the action of an external magnetic field, so that the fluid has wide application in practice and high academic value in theory. The magnetic fluid produced by the nano metal and alloy powder has excellent performance, and can be widely applied to the fields of magnetic fluid sealing, shock absorption, medical instruments, sound regulation, optical display, magnetic fluid mineral separation and the like under various severe conditions.
The magnetic liquid polishing technology is an advanced optical cold processing technology, and the viscosity of the magnetic liquid directly influences the processing effect. When the magnetic liquid is exposed to the air, the moisture in the magnetic liquid can be slowly evaporated, so that the viscosity of the magnetic liquid is increased until the magnetic liquid becomes solid; the viscosity value of the magnetic liquid can be reduced by adding water into the magnetic liquid; during the processing, the viscosity of the magnetic liquid needs to be controlled to a proper and stable level by a certain means so as to achieve the optimal processing effect. In actual production, if the control of the viscosity of the magnetic liquid is to be realized, the viscosity value needs to be quantified firstly, and the viscosity value needs to be obtained in real time in the processing process, which is almost impossible to be realized by the traditional chemical measurement method, the traditional magnetic liquid viscosity measurement is mostly contact-type measurement, for example, according to the principle that the flow rates of liquids with different viscosities are different, the liquid flow passing through a specific mechanism within a certain time is measured, or the liquid level change is measured by using a floating mark method, etc., so as to calculate the viscosity value, and the measurement method has the following disadvantages:
(1) the structure is complex, the volume is large, and the cost is high;
(2) is not easy to clean and maintain;
(3) the measurement precision is low;
(4) contact measurements can affect liquid composition stability and flow stability;
therefore, a non-contact method is provided, the viscosity of the magnetic liquid is converted into an electric signal, then the electric signal is digitized and transmitted to a control system, and the viscosity value of the magnetic liquid is calculated, so that the defects can be effectively avoided.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for measuring the viscosity of magnetic liquid, which comprises the following steps:
s1: with the viscometer both ends respectively concatenate on magnetic fluid circulation loop, the viscometer's cable with inductance test appearance electric connection, the viscometer includes trachea and enameled copper wire, be hollow structure in the viscometer, the trachea flows through there is magnetic fluid, the trachea outer lane is around there being many circles of enameled copper wire, enameled copper wire both ends respectively with inductance test appearance electric connection, magnetic fluid flows through in the viscometer, when the magnetic fluid viscosity of flowing through produces the change, the inductance value at viscometer both ends also can take place corresponding change thereupon, the inductance value at viscometer both ends is linear relation with the magnetic fluid viscosity of flowing through in the viscometer, does further analysis and handles with real-time data transmission to control system through inductance test appearance and serial bus connection.
S2: based on S1, the serial bus of the inductance tester transmits the real-time data to the control system for further analysis processing, including calculation of the viscosity of the magnetic fluid according to the inductance calculation formula:
wherein:
L 0 : coil inductance value (in units of H);
L: coil length (in m);
N: the number of turns of the coil;
S: cross-sectional area (unit m) of spiral coil2）；
μ: magnetic permeability (unit H/m) of the magnetic core inside the spiral coil;
k: a Changon coefficient;
the magnetic permeability μ is equal to the ratio of the magnetic induction B to the magnetic field strength H in the magnetic medium, i.e., μ = B/H. Commonly used is the relative permeability of the magnetic medium, which is defined as permeability μ and vacuum permeability μ0The ratio of (A) to (B) is as follows:
For paramagnetic substance
For diamagnetic substances
But both differ from 1 by a factor of 1, in most cases the relative permeability of the conductor is equal to 1, in ferromagnetic materials the relationship between B and H is a non-linear hysteresis loop, not a constant, related to H, with values much greater than 1, due to the magnetic fluidThe magnetic material contains ferromagnetic components, and the relative magnetic permeability of the magnetic material is far greater than 1; according to the principle that the magnetic permeability mu is equal to the ratio of the magnetic induction B to the magnetic field strength H in the magnetic medium, namely mu = B/H, and the magnetic induction can be linearly superposed, for the magnetic liquid with uniformly distributed ferromagnetic components, the proportion or the density of the ferromagnetic components and the relative permeability of the magnetic liquid are in a linear relationship, and therefore the viscosity value of the magnetic liquid can be obtained.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention has simple structure and low cost, magnetic liquid flows through the interior of the air pipe, when the viscosity of the flowing magnetic liquid changes, the inductance values at the two ends of the enameled copper wire can correspondingly change, the inductance values at the two ends of the enameled copper wire and the viscosity of the magnetic liquid flowing through the viscometer are in a linear relation, real-time data are transmitted to a control system for further analysis and calculation through a serial bus connected with an inductance tester, the viscosity value of the magnetic liquid is obtained according to an inductance calculation formula, the magnetic liquid flows in the air pipe in the whole measuring process, the magnetic liquid does not need to be directly contacted with other chemical detection devices, the measuring precision is high, the data are stable, the stability of the components and the flow stability of the magnetic liquid are not influenced, and the whole device is easy to clean and maintain.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a schematic view of the viscometer structure of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
As shown in fig. 1 to 2, a method for measuring the viscosity of a magnetic liquid includes an air tube 1 and an enameled copper wire 2.
The viscometer includes trachea 1 and enameled copper wire 2, the trachea outer lane is around there being many circles of enameled copper wire 2, 2 both ends of enameled copper wire and inductance tester electric connection, concatenate the viscometer both ends respectively on magnetic liquid circulation loop, the trachea 1 internal flow has magnetic liquid, when the magnetic liquid viscosity that flows through produces the change, the inductance value at 2 both ends of enameled copper wire also can take place corresponding change thereupon, the inductance value at 2 both ends of enameled copper wire is linear relation with the magnetic liquid viscosity that flows through in the viscometer, be connected with serial bus through inductance tester and make further analysis and processing with real-time data transmission to control system.
According to an inductance calculation formula:
wherein:
L 0 : coil inductance value (in units of H);
L: coil length (in m);
N: the number of turns of the coil;
S: cross-sectional area (unit m) of spiral coil2）；
μ: magnetic permeability (unit H/m) of the magnetic core inside the spiral coil;
k: a Changon coefficient;
the magnetic permeability μ is equal to the ratio of the magnetic induction B to the magnetic field strength H in the magnetic medium, i.e., μ = B/H. Commonly used is the relative permeability of the magnetic medium, which is defined as permeability μ and vacuum permeability μ0The ratio of (A) to (B) is as follows:
For paramagnetic substance
For diamagnetic substances
But both differ a little from 1, in most cases the conductorThe relative permeability of the magnetic liquid is equal to 1, in a ferromagnetic substance, the relation between B and H is a nonlinear hysteresis loop, is not a constant and is related to H, the value of the hysteresis loop is far greater than 1, and the relative permeability of the magnetic liquid is far greater than 1 because the magnetic liquid contains ferromagnetic components; according to the principle that the magnetic permeability mu is equal to the ratio of the magnetic induction B to the magnetic field strength H in the magnetic medium, namely mu = B/H, and the magnetic induction can be linearly superposed, for the magnetic liquid with uniformly distributed ferromagnetic components, the proportion or the density of the ferromagnetic components and the relative permeability of the magnetic liquid are in a linear relationship, and therefore the viscosity value of the magnetic liquid can be obtained.
The working principle of the invention is as follows: inside magnetic fluid flowed through trachea 1, when the magnetic fluid viscosity that flows through produced the change, the inductance value at 2 both ends of enamelled copper line also can take place corresponding change thereupon (arrow point to be the direction of flowing through of magnetic fluid), the inductance value at 2 both ends of enamelled copper line is linear relation with the magnetic fluid viscosity that flows through in the trachea 1, be connected real-time data transmission to control system through inductance tester and serial bus and do further analytical calculation processing, calculate the viscosity value of formula according to the inductance and obtain magnetic fluid, whole measurement process magnetic fluid all flows at trachea inside, need not other chemical detection device of direct contact, and measurement accuracy is high, data are stable, do not influence magnetic fluid composition stability and flow stability, whole device also easily washs and maintains.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and therefore, modifications, equivalent changes, improvements, etc. made in the claims of the present invention are still included in the scope of the present invention.
Claims (1)
1. A method for measuring the viscosity of a magnetic liquid is characterized in that: the method comprises the following steps:
s1: the method comprises the following steps that two ends of a viscometer are respectively connected in series on a magnetic liquid circulation loop, a cable of the viscometer is electrically connected with an inductance tester, the viscometer comprises an air pipe and an enameled copper wire, the inside of the viscometer is of a hollow structure, magnetic liquid flows through the air pipe, a plurality of circles of enameled copper wires are wound around the outer ring of the air pipe, two ends of the enameled copper wire are respectively electrically connected with the inductance tester, the magnetic liquid flows through the viscometer, when the viscosity of the flowing magnetic liquid changes, the inductance values at two ends of the viscometer can correspondingly change, the inductance values at two ends of the viscometer and the viscosity of the flowing magnetic liquid in the viscometer are in a linear relation, and real-time data are transmitted to a control system through the connection of the inductance tester and a serial bus for further analysis and processing;
s2: based on S1, the serial bus of the inductance tester transmits the real-time data to the control system for further analysis processing, including calculation of the viscosity of the magnetic fluid according to the inductance calculation formula:
wherein:
L 0 : coil inductance value, unit H;
L: coil length, in m;
N: the number of turns of the coil;
S: cross-sectional area of the spiral coil, unit m2；
μ: magnetic permeability of a magnetic core inside the spiral coil, unit H/m;
k: a Changon coefficient;
the magnetic permeability mu is equal to the ratio of magnetic induction intensity B to magnetic field intensity H in the magnetic medium, namely mu = B/H;
commonly used is the relative permeability of the magnetic medium, which is defined as permeability μ and vacuum permeability μ0The ratio of (A) to (B) is as follows:
For paramagnetic substance
For diamagnetic substances
But both of them are almost different from 1, in most cases, the relative permeability of the conductor is equal to 1, in ferromagnetic materials, the relation between B and H is a nonlinear hysteresis loop, is not a constant and is related to H, the value is far greater than 1, and the relative permeability is far greater than 1 because the magnetic liquid contains ferromagnetic components; according to the principle that the magnetic permeability mu is equal to the ratio of the magnetic induction B to the magnetic field strength H in the magnetic medium, namely mu = B/H, and the magnetic induction can be linearly superposed, for the magnetic liquid with uniformly distributed ferromagnetic components, the proportion or the density of the ferromagnetic components and the relative permeability of the magnetic liquid are in a linear relationship, and therefore the viscosity value of the magnetic liquid can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110214981.XA CN112577853B (en) | 2021-02-26 | 2021-02-26 | Method for measuring viscosity of magnetic liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110214981.XA CN112577853B (en) | 2021-02-26 | 2021-02-26 | Method for measuring viscosity of magnetic liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112577853A CN112577853A (en) | 2021-03-30 |
| CN112577853B true CN112577853B (en) | 2021-06-15 |
Family
ID=75114065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110214981.XA Active CN112577853B (en) | 2021-02-26 | 2021-02-26 | Method for measuring viscosity of magnetic liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112577853B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209356359U (en) * | 2018-12-14 | 2019-09-06 | 沈阳建筑大学 | A kind of magnetorheological liquid viscosity test device |
| CN111426614A (en) * | 2020-04-30 | 2020-07-17 | 中国工程物理研究院机械制造工艺研究所 | Magnetorheological polishing solution iron powder concentration detection device based on mutual inductance method |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD225214A1 (en) * | 1983-06-29 | 1985-07-24 | E M Arndt Uni Greifswald | METHOD FOR DETERMINING RHEOLOGICAL NUMBERS |
| SU1153270A1 (en) * | 1983-12-12 | 1985-04-30 | Опытное Конструкторско-Технологическое Бюро "Кристалл" С Опытным Производством Ленинградского Технологического Института Им.Ленсовета | Measuring unit of rotary bell-type magnetoviscometer |
| SU1441265A1 (en) * | 1987-03-30 | 1988-11-30 | Специальное проектно-конструкторское бюро "Промавтоматика" | Rotary viscometer |
| SE460995B (en) * | 1987-06-18 | 1989-12-11 | Nils Anders Brage | Appts. for rheological characterisation of material |
| SU1539592A1 (en) * | 1987-12-18 | 1990-01-30 | Азербайджанский политехнический институт им.Ч.Ильдрыма | Device for measuring parameters of liquid media |
| CN2099316U (en) * | 1991-05-23 | 1992-03-18 | 北京理工大学 | Viscosity measuring instrument for ferromagnetic fluid |
| SE507102C2 (en) * | 1996-06-26 | 1998-03-30 | Protell Ab | Method and device at rheometer |
| US20100139374A1 (en) * | 2008-12-03 | 2010-06-10 | Dermody Daniel L | Methods for rheological testing of multiple samples and systems therefor |
| RU2416089C1 (en) * | 2010-03-31 | 2011-04-10 | Государственное образовательное учреждение высшего профессионального образования "Юго-Западный государственный университет" (ЮЗГУ) | Procedure for determination of viscosity of magnetic fluid or magnetic colloid |
| CN202275038U (en) * | 2011-11-01 | 2012-06-13 | 浙江师范大学 | Device for testing rheological property of extrusion rotary disc type magnetorheological fluid |
| CN104515718B (en) * | 2013-09-30 | 2017-09-29 | 中国兵器工业第五二研究所 | Magnetic liquid magnetizes viscosity determining procedure and device |
| CN104897523B (en) * | 2015-05-15 | 2018-02-09 | 上海交通大学 | A kind of magnetic liquid rheological equationm of state test system and method |
| CN105547910B (en) * | 2015-12-09 | 2018-10-16 | 浙江大学 | The measuring device and method of low temperature slurries apparent viscosity physical property are obtained in conjunction with density measure |
| CN110160914A (en) * | 2018-02-10 | 2019-08-23 | 宁波市华顺磁业有限公司 | A kind of magnetic liquid viscous damping property test device |
| CN108679234B (en) * | 2018-07-04 | 2023-11-17 | 清华大学 | Rotary rheometer measuring system suitable for rheological property of magnetic liquid |
| CN109541014B (en) * | 2018-12-26 | 2022-09-06 | 河南工业大学 | Magnetic nanoparticle quality detection method based on magnetic signals |
| CN210894009U (en) * | 2019-07-31 | 2020-06-30 | 湖南工业大学 | non-Newtonian fluid online rheological property testing device |
-
2021
- 2021-02-26 CN CN202110214981.XA patent/CN112577853B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209356359U (en) * | 2018-12-14 | 2019-09-06 | 沈阳建筑大学 | A kind of magnetorheological liquid viscosity test device |
| CN111426614A (en) * | 2020-04-30 | 2020-07-17 | 中国工程物理研究院机械制造工艺研究所 | Magnetorheological polishing solution iron powder concentration detection device based on mutual inductance method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112577853A (en) | 2021-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0427018A2 (en) | Measuring device for measuring the speed of a fluid | |
| CN104807511B (en) | A kind of pipeline flowmeter | |
| CN106501636A (en) | A kind of electric performance testing device of micro-nano granules magnetic assembling and its method of testing | |
| CN111426614A (en) | Magnetorheological polishing solution iron powder concentration detection device based on mutual inductance method | |
| Kolin | Electromagnetic velometry. I. A method for the determination of fluid velocity distribution in space and time | |
| CN206488822U (en) | Suitable for the electromagnetic flowmeter of low flow velocity | |
| CN114113296A (en) | Magnetic signal acquisition device, magnetic sensitive immunity detection device and detection method | |
| CN112577853B (en) | Method for measuring viscosity of magnetic liquid | |
| CN101493184A (en) | Clearance structure magnetic fluid flow control device | |
| Embs et al. | Measuring the transverse magnetization of rotating ferrofluids | |
| RU2709703C1 (en) | Method of measuring magnetic field parameters | |
| CN105402298B (en) | Electromagnetic damper equilibrium feedback system | |
| CN102645642B (en) | Temperature property testing device of amorphous metal fibers | |
| US3693440A (en) | Electromagnetic flowmeter | |
| Ghadiri et al. | Experimental investigation on laminar convective heat transfer of nano ferrofluids under constant and alternating magnetic field | |
| CN114113297A (en) | Magnetic signal acquisition device, magnetic sensitive immunity detection device and detection method | |
| CN207623273U (en) | A kind of antipollution CTD conductivity probes | |
| Crainic et al. | Ferrofluids flow transducer for liquids | |
| Emelyanov et al. | Estimation of physical parameters of magnetic nanoparticles | |
| RU2591277C1 (en) | Magnetic flow meter of liquid metal | |
| CN206321715U (en) | A kind of electric performance testing device of micro-nano granules magnetic assembling | |
| CN110044542B (en) | Inductance type magnetic liquid micro-differential pressure sensor based on slider-crank mechanism | |
| Moodley et al. | A Critical Analysis of the Hot-wire Technique for Thermal Conductivity Measurements of Thermal Nanofluids. | |
| Al Jarrah et al. | Magnetic Coupling of Two Coils Due to Flow of Pure Water Inside Them–Double Coil Volumetric Flow Sensor | |
| SU756284A1 (en) | Conductometric transformer-type transducer with liquid coupling turn |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Nianming Inventor after: Cheng Shuai Inventor before: Liu Nianming Inventor before: Li Wenjian |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230718 Address after: 215345 Room 2, No. 108, Shuanghe Road, Dianshanhu Town, Kunshan City, Suzhou City, Jiangsu Province Patentee after: Langxin (Suzhou) Precision Optics Co.,Ltd. Address before: Room 101, building 10, zone a, phase VI industrial building, jindaoyuan, 169 Huizhi Middle Road, high tech Development Zone, Changsha, Hunan 410000 Patentee before: Hunan craftsman Shichuang Intelligent Machine Co.,Ltd. |
|
| TR01 | Transfer of patent right |