CN110193318B - Nano-fluid agglomeration preventing method based on photoacoustic effect - Google Patents
Nano-fluid agglomeration preventing method based on photoacoustic effect Download PDFInfo
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- CN110193318B CN110193318B CN201910474919.7A CN201910474919A CN110193318B CN 110193318 B CN110193318 B CN 110193318B CN 201910474919 A CN201910474919 A CN 201910474919A CN 110193318 B CN110193318 B CN 110193318B
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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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Abstract
The invention provides a nano-fluid agglomeration preventing method based on a photoacoustic effect, which is used for solving the agglomeration problem of nano-particles in a nano-fluid cooling machining process. Fixing a nano gold solution tank at the tail end of a quartz optical fiber, placing the quartz optical fiber above the nanofluid, simultaneously opening a nanosecond pulse laser, coupling pulse laser into the quartz optical fiber from the upper end through a lens, generating a microcavity in the shape of a crater under the irradiation of the laser, and subjecting the microcavity to rapid and periodic volume expansion and contraction to generate directional ultrasonic waves and realize photoacoustic conversion; the ultrasonic wave may cause the nanofluid to oscillate so that agglomeration of nanoparticles may be effectively prevented. The motion platform drives the quartz optical fiber and the nano-gold solution tank to move, so that the anti-agglomeration of nano-fluid in different areas is realized. The CCD is adopted for real-time monitoring, and the motion platform is driven in time, so that the agglomeration problem of the nanofluid is effectively, quickly and accurately solved.
Description
Technical Field
The invention relates to a method for preventing nanofluid agglomeration, in particular to a method for preventing nanofluid agglomeration based on a photoacoustic effect.
Background
The nano fluid is a novel uniform, stable and high-heat-conductivity heat exchange medium prepared by dispersing metal or nonmetal nano particles into a traditional liquid heat exchange medium such as water, oil and the like. The nano fluid has wide prospects in the fields of energy, chemical industry, automobiles, buildings, microelectronics, information and the like, so that the nano fluid becomes a research hotspot in a plurality of fields of materials, physics, chemistry, heat transfer science and the like.
The nano fluid is gradually applied to the mechanical processing process to play a role in lubricating and cooling due to the characteristic of enhancing heat transfer of the nano fluid. However, when the nano fluid is left standing for a long time, the nano particles in the nano fluid are easy to form aggregates and have a sedimentation phenomenon, and the aggregates directly influence the heat transfer and cooling efficiency of the nano fluid. The invention patent with the publication number of CN 108499202A and the invention name of a device for preventing nano fluid particles from agglomerating and settling in a heat exchange system discloses a device for preventing nano fluid particles from agglomerating and settling in the heat exchange system. However, the following problems still exist in the technical scheme: the collision force between the fluid and the pipe wall is difficult to change the problem of nanoparticle agglomeration in the central area of the pipe; and due to the arrangement density of the bulges on the inner wall of the pipeline, the collision frequency between the nanofluid and the pipe wall is very low, and the agglomeration of nanoparticles near the pipe wall is inevitable.
The invention patent with the publication number of 'CN 103418159A' and the invention name of 'a new method for preventing nano-particles from re-agglomerating in the process of supercritical fluid rapid expansion' discloses a method for preventing nano-particles from re-agglomerating, which is characterized in that an RESS technology is utilized to deposit a layer of organic film on the surface of specific nano-particles, thereby solving the problem of nano-particle agglomeration to a certain extent. However, the following problems still exist in the technical scheme: the types of nanoparticles treated by the RESS technology are specific, the quantity of nanoparticles treated in one time is limited, and the process and process parameters of the RESS technology are difficult to control.
Disclosure of Invention
In order to solve the existing problems, the invention provides a nano-fluid agglomeration preventing method based on a photoacoustic effect, which is used for solving the agglomeration problem of nano-particles in the machining process of cooling by adopting nano-fluid. The pulse laser enters the quartz fiber from the upper end through the lens in a coupling mode, the nano-gold particles at the tail end of the quartz fiber can generate a microcavity shaped like a crater under the irradiation of the laser, and the microcavity can undergo rapid and periodic volume expansion and contraction, so that directional ultrasonic waves are generated; the ultrasonic wave can enable the nano fluid to oscillate, so that the agglomeration of nano particles can be effectively prevented; the motion platform drives the quartz optical fiber and the nano-gold solution tank to move, adopts CCD to monitor in real time, and drives the motion platform in due time, so that the nano-fluid in different areas is prevented from agglomerating, and the agglomeration problem of the nano-fluid is effectively, quickly and accurately solved.
In order to achieve the purpose, the technical scheme adopted by the invention is divided into the following steps: the method comprises the following steps: loading a nano-gold solution prepared from nano-gold particles into a nano-gold solution tank, and fixing the nano-gold solution tank at the tail end of the quartz optical fiber; the quartz optical fiber is arranged on the motion platform and is placed above the nano fluid. Step two: setting the output energy of the nanosecond pulse laser, adjusting the focusing position of the lens, and adjusting and coordinating the motion platform, the CCD and the computer control system. Step three: opening nanosecond pulse laser, pulse laser gets into quartz fiber from the upper end coupling through the lens, and the nano-gold granule in the terminal nano-gold solution jar of quartz fiber can produce the microcavity like crater under the irradiation of laser, and the microcavity can experience quick, periodic volume expansion and shrink to produce directional ultrasonic wave, thereby the ultrasonic wave can make the oscillation of nanometer fluid can effectively prevent the nanoparticle reunion or dispel the nanoparticle of reunion. Step four: opening the CCD, and monitoring the distribution state of particles in the nanofluid in real time; when the nano particles are agglomerated, the light signal sensed by the photosensitive element on the CCD is weakened, and the monitoring result is transmitted to the computer control system. Step five: the computer control system starts the motion platform to move the quartz optical fiber and the nano-gold solution tank to an agglomeration area in due time according to a signal transmitted by the CCD in real time, and ultrasonic vibration is generated by nano-gold particles in the nano-gold solution tank, so that the agglomerated nano-particles in the nano-fluid are dispersed, and the agglomeration problem of the nano-fluid is effectively solved.
The concentration of the nano-gold solution contained in the nano-gold solution tank is 0.3-0.6 mg/ml, and the size of the nano-gold particles is 40-60 nm.
The nanosecond pulse laser has the wavelength of 527nm, the pulse width of 150ns, the repetition frequency of 1kHz and the average power of 120-130 mW.
When the focusing position of the lens is adjusted, the energy coupling coefficient of laser pulses emitted by the nanosecond pulse laser and coupled into the quartz optical fiber is more than 0.5.
The quartz optical fiber is a multimode optical fiber with the fiber core diameter of 500-1000 mu m; the CCD is a photodetector, i.e., a charge coupler, and the number of image-sensitive cells is 5000 × 1.
The nanosecond pulse laser, the lens and the quartz optical fiber are all arranged on the moving platform.
Compared with the prior art, the invention has the following beneficial effects:
② wide applicability, according to the concentration difference of the nano-gold solution contained in the nano-gold solution tank, the focusing position of the lens is adjusted and the difference of the output energy of the nanosecond pulse laser is set, so that the ultrasonic wave generated based on the photoacoustic effect is suitable for the agglomeration problem of most nano-fluid.
③ is sensitive in reaction, the light signal sensed by the photosensitive element on the CCD is weakened, an instruction is given to a computer control system, the motion platform is started timely to move the quartz optical fiber and the nano-gold solution tank to an agglomeration area, ultrasonic vibration generated by nano-gold particles in the nano-gold solution tank can disperse the agglomerated nano-particles in the nano-fluid, and the agglomeration problem of the nano-fluid is accurately solved.
④ the operation is convenient and simple, the ultrasonic wave can be generated based on the photoacoustic effect only by setting the output energy of the nanosecond pulse laser and adjusting the focusing position of the lens, the agglomeration of the nanofluid is solved by the ultrasonic wave high-frequency vibration, and the operation is simple and convenient.
Drawings
FIG. 1 is a schematic diagram of the process of the present invention.
FIG. 2 is a schematic diagram of the optical path in the fiber of the present invention.
Fig. 3 is a schematic representation of photoacoustic conversion in accordance with the present invention.
The labels in the above fig. 1 to 3 are: 1-nanosecond pulse laser, 2-lens, 3-quartz fiber, 4-nano gold solution tank and 5-nano fluid.
Claims (6)
1. A nano-fluid agglomeration preventing method based on a photoacoustic effect is characterized by comprising the following steps:
the method comprises the following steps: putting a nano gold solution prepared from nano gold particles into a nano gold solution tank (4), and fixing the nano gold solution tank (4) at the tail end of the quartz optical fiber (3); the quartz optical fiber (3) is arranged on the motion platform and is placed above the nano fluid (5);
step two: setting the output energy of a nanosecond pulse laser (1), adjusting the focusing position of a lens (2), and adjusting and coordinating a motion platform, a CCD and a computer control system;
step three: opening a nanosecond pulse laser (1), coupling pulse laser into a quartz fiber (3) from the upper end through a lens (2), generating a microcavity in the shape of a crater by using nano-gold particles in a nano-gold solution tank (4) at the tail end of the quartz fiber (3) under the irradiation of the laser, and subjecting the microcavity to rapid and periodic volume expansion and contraction to generate directional ultrasonic waves, wherein the ultrasonic waves can oscillate nano-fluid so as to effectively prevent the nano-particles from agglomerating or disperse the agglomerated nano-particles;
step four: opening the CCD, and monitoring the distribution state of the particles in the nanofluid (5) in real time; when the nano particles are agglomerated, the optical signal sensed by the photosensitive element on the CCD is weakened, and the monitoring result is transmitted to the computer control system;
step five: the computer control system starts the motion platform to move the quartz optical fiber (3) and the nano-gold solution tank (4) to an agglomeration area in due time according to a signal transmitted by the CCD in real time, and ultrasonic vibration is generated by nano-gold particles in the nano-gold solution tank (4), so that the agglomerated nano-particles in the nano-fluid (5) are dispersed, and the agglomeration problem of the nano-fluid (5) is effectively solved.
2. The anti-agglomeration method for nano-fluid based on photoacoustic effect as claimed in claim 1, wherein: the concentration of the nano-gold solution contained in the nano-gold solution tank (4) is 0.3-0.6 mg/ml, and the size of nano-gold particles is 40-60 nm.
3. The anti-agglomeration method for nano-fluid based on photoacoustic effect as claimed in claim 1, wherein: the nanosecond laser (1) has the wavelength of 527nm, the pulse width of 150ns, the repetition frequency of 1kHz and the average power of 120-130 mW.
4. The anti-agglomeration method for nano-fluid based on photoacoustic effect as claimed in claim 1, wherein: when the focusing position of the lens (2) is adjusted, the energy coupling coefficient of laser pulses emitted by the nanosecond pulse laser (1) and coupled into the quartz optical fiber (3) is ensured to be larger than 0.5.
5. The anti-agglomeration method for nano-fluid based on photoacoustic effect as claimed in claim 1, wherein: the quartz optical fiber (3) is a multimode optical fiber with the fiber core diameter of 500-1000 mu m; the CCD is a charge coupler, and the number of image-sensitive units is 5000 × 1.
6. The anti-agglomeration method for nano-fluid based on photoacoustic effect as claimed in claim 1, wherein: the nanosecond pulse laser (1), the lens (2) and the quartz optical fiber (3) are all installed on the moving platform.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN110193318B true CN110193318B (en) | 2020-05-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110193318B (en) * | 2019-06-03 | 2020-05-29 | 长沙理工大学 | Nano-fluid agglomeration preventing method based on photoacoustic effect |
| CN111872737A (en) * | 2020-07-30 | 2020-11-03 | 李波 | Nano-fluid agglomeration preventing device for machining |
| CN112317285A (en) * | 2020-10-27 | 2021-02-05 | 天津大学 | High-directivity optical fiber photoacoustic transducer and method |
| 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 |
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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 |
| CN206566846U (en) * | 2017-03-15 | 2017-10-20 | 贵州理工学院 | A kind of ultrasonic disperse device of temperature-controllable |
| WO2017204441A1 (en) * | 2016-05-25 | 2017-11-30 | 부경대학교 산학협력단 | Nanoparticle dispersing apparatus using ultrasonic streaming and shock waves |
| CN108252891A (en) * | 2018-03-05 | 2018-07-06 | 河南工程学院 | A kind of Laser Driven Macro Flow device and method based on optical fiber |
| CN208660990U (en) * | 2018-05-14 | 2019-03-29 | 宿迁市第一人民医院 | A kind of efficient ultrasonic wave dispersion instrument for nano-carrier preparation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI572449B (en) * | 2014-03-24 | 2017-03-01 | 國立屏東科技大學 | Nanofluid minimal quantity lubrication device |
| CN110193318B (en) * | 2019-06-03 | 2020-05-29 | 长沙理工大学 | Nano-fluid agglomeration preventing method based on photoacoustic effect |
| CN110193319B (en) * | 2019-06-03 | 2020-05-29 | 长沙理工大学 | Nano-fluid anti-agglomeration device based on photoacoustic effect |
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- 2019-06-03 CN CN201910474919.7A patent/CN110193318B/en active Active
- 2019-10-12 WO PCT/CN2019/110844 patent/WO2020244111A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108252891A (en) * | 2018-03-05 | 2018-07-06 | 河南工程学院 | A kind of Laser Driven Macro Flow device and method based on optical fiber |
| CN208660990U (en) * | 2018-05-14 | 2019-03-29 | 宿迁市第一人民医院 | A kind of efficient ultrasonic wave dispersion instrument for nano-carrier preparation |
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| CN110193318A (en) | 2019-09-03 |
| WO2020244111A1 (en) | 2020-12-10 |
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