CN110193318A - A kind of nano-fluid anti-agglomeration method based on optoacoustic effect - Google Patents
A kind of nano-fluid anti-agglomeration method based on optoacoustic effect Download PDFInfo
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- CN110193318A CN110193318A CN201910474919.7A CN201910474919A CN110193318A CN 110193318 A CN110193318 A CN 110193318A CN 201910474919 A CN201910474919 A CN 201910474919A CN 110193318 A CN110193318 A CN 110193318A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/55—Mixing liquids with solids the mixture being submitted to electrical, sonic or similar energy
- B01F23/551—Mixing liquids with solids the mixture being submitted to electrical, sonic or similar energy using vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
- B01F31/70—Drives therefor, e.g. crank mechanisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
- B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
- B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
- B01F31/89—Methodical aspects; Controlling
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- Dispersion Chemistry (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The nano-fluid anti-agglomeration method based on optoacoustic effect that the invention proposes a kind of, for solving the agglomeration traits using nano particle in the cooling mechanical processing process of nano-fluid.Nano-Au solution tank is fixed on to the end of silica fibre; silica fibre is placed on above nano-fluid; open simultaneously nanosecoud pulse laser; pulse laser is coupled into silica fibre from upper end through lens; the nanogold particle of silica fibre end can generate the microcavity shaped like volcanic crater under the irradiation of laser; and microcavity can undergo quick, periodic volume expansion and contraction, to generate the ultrasonic wave of orientation, realize optoacoustic conversion；Ultrasonic wave can make nano-fluid oscillating so as to effectively prevent nanoparticle agglomerates.Motion platform drives silica fibre and nano-Au solution tank mobile, realizes the anti-agglomeration of different zones nano-fluid.Using CCD real-time monitoring, and motion platform is driven in due course, to effectively, quickly, accurately solve the agglomeration traits of nano-fluid.
Description
Technical field
The present invention relates to a kind of method for preventing nano-fluid from reuniting, especially a kind of nano-fluids based on optoacoustic effect
Anti-agglomeration method.
Background technique
Nano-fluid, which refers to, to be distributed to metal or non pinetallic nano particle in the conventional liquids heat transferring medium such as water, oil, system
For at uniform, stable, high thermal conductivity novel heat exchange medium.Nano-fluid is in the energy, chemical industry, automobile, building, microelectronics, information
Equal fields obtain extensive prospect, to become the research hotspot of the various fields such as material, physics, chemistry, thermal conduction study.
Due to the characteristic of nano-fluid augmentation of heat transfer, it is allowed to just gradually be applied to play lubrication in mechanical processing process
Effect.But when nano-fluid is stood for a long time, simultaneously there is sedimentation phenomenon in nano particle therein aggregate easy to form, reunites
Body directly affects the heat transfer cooling efficiency of nano-fluid.Publication No. " CN108499202 A " entitled " prevents from changing
The patent of invention of the device that nano-fluid particle agglomeration settles in hot systems ", which discloses one kind, prevents nano-fluid in heat-exchange system
The device of particle agglomeration sedimentation, principle are that some protrusions are arranged in inner wall of the pipe, when fluid flows Shi Huiyu pipe in pipeline
Collision is generated between road inner wall protrusion, to prevent the reunion and sedimentation of nano particle, which solves to a certain extent
The problem of nano-fluid reunion sedimentation.But the technical solution still has the following problems: the impact force between fluid and tube wall
It is difficult to change the nanoparticle agglomerates problem in area, pipeline center；And it is limited by the layout density of inner wall of the pipe protrusion, nanometer stream
Collision frequency between body and tube wall is very low, and inevitably still there are nanoparticle agglomerates for near-wall.
Publication No. " CN103418159 A " entitled " prevents nanometer during supercritical fluid quick expansion
The patent of invention of the new method that particle is reunited again ", which discloses one kind, prevents nanoparticle method of agglomeration again, and principle is to utilize
RESS technology deposits one layer of organic thin film in specific nanoparticle surface, solves nano particle group to a certain extent
Poly- problem.But the technical solution still has the following problems: it is specific using nanoparticle type handled by RESS technology,
The limited amount of single treatment nanoparticle, and the technique of RESS technology and technological parameter are difficult to control.
Summary of the invention
To solve existing issue, the nano-fluid anti-agglomeration method based on optoacoustic effect that the invention proposes a kind of is used for
Solve the agglomeration traits using nano particle in the cooling mechanical processing process of nano-fluid.Its main working process is that pulse swashs
Light is coupled into silica fibre from upper end through lens, and the nanogold particle of silica fibre end can generate shape under the irradiation of laser
Such as the microcavity at volcanic crater, and microcavity can undergo quick, periodic volume expansion and contraction, to generate the ultrasonic wave of orientation；
Ultrasonic wave can make nano-fluid oscillating so as to effectively prevent nanoparticle agglomerates；Motion platform drives silica fibre and receives
Rice gold solution tank is mobile, and uses CCD real-time monitoring, and drive motion platform in due course, realizes different zones nano-fluid
Anti-agglomeration so effectively, quickly, accurately solve nano-fluid agglomeration traits.
To achieve the goals above, the technical solution adopted by the present invention is divided into the following steps: step 1: will be by nanometer
Nano-Au solution made of gold particle is packed into nano-Au solution tank, and nano-Au solution tank is fixed on to the end of silica fibre；
Silica fibre is installed on the moving platform, is placed on above nano-fluid.Step 2: the output energy of nanosecoud pulse laser is set
Amount adjusts the focal position of lens, adjustment motion platform, CCD and computer control system, and is allowed to mutually coordinated.Step 3:
Nanosecoud pulse laser is opened, pulse laser is coupled into silica fibre from upper end through lens, the quartzy light under the irradiation of laser
Nanogold particle in fine end nano-Au solution tank can generate the microcavity shaped like volcanic crater, and microcavity can undergo the quick, period
The volume expansion and contraction of property, to generate the ultrasonic wave of orientation, ultrasonic wave can make nano-fluid oscillating so as to effective
It prevents nanoparticle agglomerates or disperses the nano particle reunited.Step 4: opening CCD, in real-time monitoring nano-fluid
The distribution of grain；When nano particle is reunited, the optical signal that the light-sensitive element above CCD is perceived dies down, and will
Monitoring result sends computer control system to.Step 5: computer control system is according to the signal of CCD real-time Transmission, in due course
Start motion platform and silica fibre is moved to reunion region together with nano-Au solution tank, the nanogold in nano-Au solution tank
The ultrasonic activation that grain generates, to disperse the nano particle reunited in nano-fluid, the reunion for effectively solving nano-fluid is asked
Topic.
The concentration of nano-Au solution contained by nano-Au solution tank is 0.3 ~ 0.6 mg/ml, and the size of nanogold particle is
40~60 nm。
The wavelength of nanosecoud pulse laser is 527 nm, its pulsewidth is 150 ns, repetition rate is 1 kHz, mean power
For 120 ~ 130 mW.
When adjusting the focal position of lens, it is ensured that the laser pulse that nanosecoud pulse laser issues is coupled into silica fibre
Energy coupling coefficient be greater than 0.5.
Silica fibre is the multimode fibre that core diameter is 500 ~ 1000 μm；CCD is photodetector, i.e. Charged Couple
Device, image-sensitive unit number are 5000 × 1.
Nanosecoud pulse laser, lens and silica fibre are respectively mounted on the moving platform.
Compared with prior art, the invention has the following advantages:
Validity is high.Nanogold particle can undergo quick, periodic volume expansion and receipts under the irradiation of pulse laser
Contracting, to generate ultrasonic wave.Ultrasonic wave can make the nano-fluid higher-order of oscillation so as to effectively prevent nanoparticle agglomerates, and
So that the nano particle reunited is evenly dispersed into base fluid, so that nano-fluid be effectively prevent to reunite.
2. applicability is wide.According to the difference of nano-Au solution concentration contained by nano-Au solution tank, the focusing of lens is adjusted
The difference of the output energy of position and setting nanosecoud pulse laser, can make based on ultrasonic wave caused by optoacoustic effect
Suitable for most nano-fluid agglomeration traits.
3. being quick on the draw.The optical signal that light-sensitive element above CCD perceives dies down, and can give computer control system and refer to
It enables, starts motion platform in due course for silica fibre and be moved to reunion region together with nano-Au solution tank, in nano-Au solution tank
The ultrasonic activation that nanogold particle generates, can disperse the nano particle reunited in nano-fluid, precisely solve and receive
The agglomeration traits of meter Liu Ti.
4. convenient and simple for operation.It only needs to be arranged the output energy of nanosecoud pulse laser and adjusts the focusing of lens
Position, it will be able to ultrasonic wave be generated based on optoacoustic effect, ultrasonic wave high-frequency vibration solves the agglomeration traits of nano-fluid, operation letter
Folk prescription is just.
Detailed description of the invention
Fig. 1 is the method for the present invention simplified diagram.
Fig. 2 is light path schematic diagram in optical fiber of the present invention.
Fig. 3 is optoacoustic conversion schematic diagram of the present invention.
Mark of the figure 1 above into Fig. 3 are as follows: 1-nanosecoud pulse laser, 2-lens, 3-silica fibres, 4-nanometers
Gold solution tank, 5-nano-fluids.
Claims (6)
1. a kind of nano-fluid anti-agglomeration method based on optoacoustic effect, which is characterized in that its step are as follows:
Step 1: the nano-Au solution made of nanogold particle is packed into nano-Au solution tank (4), and by nano-Au solution tank
(4) it is fixed on the end of silica fibre (3)；Silica fibre (3) is installed on the moving platform, is placed on above nano-fluid (5)；
Step 2: the output energy of setting nanosecoud pulse laser (1) adjusts the focal position of lens (2), and adjustment movement is flat
Platform, CCD and computer control system, and it is allowed to mutually coordinated；
Step 3: opening nanosecoud pulse laser (1), and pulse laser is coupled into silica fibre (3) from upper end through lens (2),
Nanogold particle under the irradiation of laser in silica fibre (3) end nano-Au solution tank (4) can be generated shaped like volcanic crater
Microcavity, and microcavity can undergo quick, periodic volume expansion and contraction, to generate the ultrasonic wave of orientation, ultrasonic wave can make
Nano-fluid oscillating is obtained so as to effectively prevent nanoparticle agglomerates or disperse the nano particle reunited；
Step 4: opening CCD, the distribution of particle in real-time monitoring nano-fluid (5)；When nano particle is reunited,
The optical signal that light-sensitive element above CCD is perceived dies down, and sends monitoring result to computer control system；
Step 5: computer control system starts motion platform for silica fibre (3) according to the signal of CCD real-time Transmission in due course
It is moved to reunion region together with nano-Au solution tank (4), the ultrasonic wave vibration that the nanogold particle in nano-Au solution tank (4) generates
It is dynamic, to disperse the nano particle reunited in nano-fluid (5), effectively solve the agglomeration traits of nano-fluid (5).
2. a kind of nano-fluid anti-agglomeration method based on optoacoustic effect according to claim 1, it is characterised in that: nanometer
The concentration of nano-Au solution contained by gold solution tank (4) is 0.3 ~ 0.6 mg/ml, and the size of nanogold particle is 40 ~ 60 nm.
3. wanting 1 to seek a kind of nano-fluid anti-agglomeration method based on optoacoustic effect according to right, it is characterised in that: nanosecond
The wavelength of laser (1) is 527 nm, its pulsewidth is 150 ns, repetition rate is 1 kHz, mean power is 120 ~ 130 mW.
4. wanting 1 to seek a kind of nano-fluid anti-agglomeration method based on optoacoustic effect according to right, it is characterised in that: adjustment
When the focal position of lens (2), it is ensured that the laser pulse that nanosecoud pulse laser (1) issues is coupled into silica fibre (3)
Energy coupling coefficient is greater than 0.5.
5. a kind of nano-fluid anti-agglomeration method based on optoacoustic effect according to claim 1, it is characterised in that: quartz
Optical fiber (3) is the multimode fibre that core diameter is 500 ~ 1000 μm；CCD is photodetector, i.e. charge-coupled device, image-sensitive
Unit number is 5000 × 1.
6. a kind of nano-fluid anti-agglomeration method based on optoacoustic effect according to claim 1, it is characterised in that: nanosecond
Pulse laser (1), lens (2) and silica fibre (3) are respectively mounted on the moving platform.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910474919.7A CN110193318B (en) | 2019-06-03 | 2019-06-03 | Nano-fluid agglomeration preventing method based on photoacoustic effect |
| PCT/CN2019/110844 WO2020244111A1 (en) | 2019-06-03 | 2019-10-12 | Photoacoustic effect-based method for preventing nanometer fluid from agglomerating |
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| CN201910474919.7A CN110193318B (en) | 2019-06-03 | 2019-06-03 | Nano-fluid agglomeration preventing method based on photoacoustic effect |
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| CN110193318A true CN110193318A (en) | 2019-09-03 |
| CN110193318B CN110193318B (en) | 2020-05-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111872737A (en) * | 2020-07-30 | 2020-11-03 | 李波 | Nano-fluid agglomeration preventing device for machining |
| WO2020244111A1 (en) * | 2019-06-03 | 2020-12-10 | 长沙理工大学 | Photoacoustic effect-based method for preventing nanometer fluid from agglomerating |
| CN112317450A (en) * | 2020-10-27 | 2021-02-05 | 天津大学 | Ultrasonic fixed-point cleaning device and method based on photoacoustic jet flow effect |
| CN112317285A (en) * | 2020-10-27 | 2021-02-05 | 天津大学 | High-directivity optical fiber photoacoustic transducer and method |
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2019
- 2019-06-03 CN CN201910474919.7A patent/CN110193318B/en active Active
- 2019-10-12 WO PCT/CN2019/110844 patent/WO2020244111A1/en active Application Filing
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| JPH09122611A (en) * | 1995-10-31 | 1997-05-13 | Toppan Printing Co Ltd | Ultrasonic cleaning apparatus |
| CN204469632U (en) * | 2015-01-29 | 2015-07-15 | 北京科技大学 | A kind of composite ultraphonic even-dispersing device |
| WO2017204441A1 (en) * | 2016-05-25 | 2017-11-30 | 부경대학교 산학협력단 | Nanoparticle dispersing apparatus using ultrasonic streaming and shock waves |
| CN206566846U (en) * | 2017-03-15 | 2017-10-20 | 贵州理工学院 | A kind of ultrasonic disperse device of temperature-controllable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020244111A1 (en) * | 2019-06-03 | 2020-12-10 | 长沙理工大学 | Photoacoustic effect-based method for preventing nanometer fluid from agglomerating |
| CN111872737A (en) * | 2020-07-30 | 2020-11-03 | 李波 | Nano-fluid agglomeration preventing device for machining |
| CN112317450A (en) * | 2020-10-27 | 2021-02-05 | 天津大学 | Ultrasonic fixed-point cleaning device and method based on photoacoustic jet flow effect |
| CN112317285A (en) * | 2020-10-27 | 2021-02-05 | 天津大学 | High-directivity optical fiber photoacoustic transducer and method |
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| Publication number | Publication date |
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| WO2020244111A1 (en) | 2020-12-10 |
| CN110193318B (en) | 2020-05-29 |
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