CN115452661A - Solid aerosol generating device in atmospheric boundary layer environment wind tunnel - Google Patents
Solid aerosol generating device in atmospheric boundary layer environment wind tunnel Download PDFInfo
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- CN115452661A CN115452661A CN202211025495.4A CN202211025495A CN115452661A CN 115452661 A CN115452661 A CN 115452661A CN 202211025495 A CN202211025495 A CN 202211025495A CN 115452661 A CN115452661 A CN 115452661A
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- 239000008275 solid aerosol Substances 0.000 title claims abstract description 41
- 239000002245 particle Substances 0.000 claims abstract description 119
- 239000000203 mixture Substances 0.000 claims abstract description 36
- 238000005192 partition Methods 0.000 claims abstract description 8
- 239000000428 dust Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 238000009331 sowing Methods 0.000 claims 1
- 238000004088 simulation Methods 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 abstract description 2
- 239000000443 aerosol Substances 0.000 description 20
- 238000009792 diffusion process Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002285 radioactive effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
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Abstract
The invention relates to a solid aerosol generating device in an atmospheric boundary layer environment wind tunnel, belonging to the technical field of nuclear facility radiation evaluation and prediction, and the device comprises a feeding system, wherein the feeding system sequentially comprises a top cover, a funnel and an impeller pump from top to bottom, and the lower end of the impeller pump is communicated with a broadcasting system; the broadcasting system comprises an inner barrel, the inner barrel is arranged on an inner barrel base, an air particle mixture flow channel is limited and formed between the inner barrel and the inner barrel base, and the inner barrel base are arranged in an outer barrel; a flow channel partition wall is arranged in the inner barrel and divides the inner space of the inner barrel into an air flow channel and a particle flow channel which are communicated at the bottom from inside to outside; the middle of the top end of the outer barrel is provided with a first air inlet and a particle inlet, and the first air inlet and the particle inlet are respectively communicated with the air flow channel and the particle flow channel; the side wall of the inner barrel is provided with a plurality of small holes, and the top end of the outer barrel close to the periphery is provided with an air and particle mixture outlet communicated with an air particle mixture flow passage. The invention can realize the release simulation of the solid aerosol.
Description
Technical Field
The invention belongs to the technical field of nuclear facility radiation evaluation and prediction, and particularly relates to a solid aerosol generating device in an atmospheric boundary layer environment wind tunnel.
Background
In nuclear accidents such as chernobiles in 1986 and fukushima in 2011, radioactive gases and aerosols were released and diffused into the atmosphere and then deposited, resulting in long-term contamination of the entire area. In the space of a typical nuclear site, there are large amounts of environmental aerosols, and they tend to be radioactive, which can have a significant impact on the surrounding environment and human health. The research on the aerosol diffusion and deposition usually has three means, namely field actual measurement, wind tunnel simulation and numerical simulation, and the wind tunnel has the advantages of controllable experimental conditions and credible experimental results, so that the research on the diffusion and deposition characteristics of the aerosol in the typical nuclear site in the environmental wind tunnel has a vital significance in accurately predicting and evaluating the spatial distribution of the aerosol in the nuclear site.
When studying the diffusion of aerosol in an environmental wind tunnel, the generation of aerosol is considered first, and particularly when considering point source discharge aerosol, several aspects need to be considered: (1) sustained release; (2) the concentration and flow rate of the particles can be adjusted; and (3) being capable of screening aerosol particles. Therefore, there is a need to develop a solid aerosol generating device that meets the above requirements.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the solid aerosol generating device in the atmospheric boundary layer environment wind tunnel, which can realize the release simulation of the solid aerosol and provide an experimental platform for researching the diffusion and deposition characteristics of the environment aerosol in a typical nuclear site and accurately predicting and evaluating the spatial distribution of the aerosol in the nuclear site.
In order to achieve the above purposes, the invention adopts a technical scheme that:
a solid aerosol generating device in an atmospheric boundary layer environment wind tunnel comprises a feeding system and a broadcasting system, wherein:
the feeding system comprises a top cover, a funnel, an impeller pump and a driving motor thereof from top to bottom in sequence, and the lower end of the impeller pump is connected with the broadcasting system through a pipeline;
the broadcasting system comprises an inner barrel, the inner barrel is arranged on an inner barrel base, an air particle mixture flow channel is limited and formed between the inner barrel and the inner barrel base, and the inner barrel base are arranged in an outer barrel;
a flow channel partition wall is arranged in the inner barrel and divides the inner space of the inner barrel into an air flow channel and a particle flow channel from inside to outside, and the air flow channel is communicated with the bottom of the particle flow channel;
a first air inlet and a particle inlet are formed in the middle positions of the top end of the outer barrel and the top end of the inner barrel, and the first air inlet and the particle inlet are respectively communicated with the air flow channel and the particle flow channel; the side wall of the inner barrel is provided with a plurality of small holes, the top end of the outer barrel close to the periphery is provided with an air and particle mixture outlet, and the air and particle mixture outlet is communicated with the air particle mixture flow passage.
Further, according to the solid aerosol generating device in the atmospheric boundary layer environment wind tunnel, the rotating speed of the impeller pump is adjustable, and the control of the feeding speed is realized by adjusting the rotating speed of the impeller pump.
Further, in the solid aerosol generating device in the wind tunnel in the atmospheric boundary layer environment, a gate valve is arranged between the top cover and the funnel and used for preventing the dust from being sprayed out when the particles are added.
Further, according to the solid aerosol generating device in the atmospheric boundary layer environment wind tunnel, the funnel is provided with the observation window for observing the residual amount of the particles in the funnel, so that the particles can be added in time, and the device is maintained to continuously release the solid aerosol.
Further, according to the solid aerosol generating device in the wind tunnel in the atmospheric boundary layer environment, the middle of the flow channel dividing wall is provided with a connecting channel, the air flow channel and the particle flow channel are communicated through the connecting channel, and a part of air entering from the first air inlet can be separated to the particle flow channel through the connecting channel, so as to pre-blow away agglomerated particles.
Further, according to the solid aerosol generating device in the atmospheric boundary layer environment wind tunnel, a second air inlet is formed in the middle of the bottom end of the inner barrel and the bottom end of the outer barrel, and the second air inlet is communicated with the air particle mixture flow passage.
Further, as above solid aerosol generating device in the atmospheric boundary layer environment wind tunnel, a filter screen is arranged at the top end of the inner cylinder inside the outer cylinder and used for filtering out particles which do not meet experimental requirements.
Further, in the solid aerosol generating device in the atmospheric boundary layer environment wind tunnel as described above, the number of the air and particle mixture outlets is plural.
Further, according to the solid aerosol generating device in the atmospheric boundary layer environment wind tunnel, the inner barrel comprises an upper section and a lower section, the upper section is cylindrical, the lower section is conical, and the side wall of the upper section of the inner barrel is provided with a plurality of small holes.
Further, according to the solid aerosol generating device in the atmospheric boundary layer environment wind tunnel, a pressure gauge is arranged at the top end of the outer cylinder and used for monitoring the internal pressure of the broadcasting system in real time.
The solid aerosol generating device in the wind tunnel of the atmospheric boundary layer environment has the following remarkable technical effects:
1. the feeding system can continuously and stably add particles without stopping to realize the continuous release of the solid aerosol;
2. the feeding system is provided with an impeller pump, and the regulation of the concentration and the flow of supplied particles is realized by regulating the rotating speed of the impeller pump;
3. through set up the filter screen at the inner tube top, can filter the particle that does not satisfy the experiment requirement, realize the screening to aerosol granule.
Drawings
FIG. 1 is a schematic structural diagram of a solid aerosol generating device in an atmospheric boundary layer environment wind tunnel according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the solid aerosol generating device according to the present invention;
FIG. 3 is a schematic diagram of the operation of the solid aerosol generating device of the present invention;
FIGS. 4a-4c are graphs showing outlet particle size spectra measured using the apparatus of the present invention, wherein FIG. 4a is a graph showing the distribution of 1 μm silica particle size at the outlet; FIG. 4b is a graph showing the particle size distribution of 10 μm alumina at the outlet; FIG. 4c is a graph showing the distribution of the particle size of 100 μm alumina at the outlet;
in the figure: 1-top cover, 2-gate valve, 3-funnel, 4-observation window, 5-impeller pump, 6-first air inlet, 7-air and particle mixture outlet, 8-particle flow channel, 9-air flow channel, 10-inner barrel, 11-inner barrel base, 12-filter screen, 13-second air inlet, 14-outer barrel, 15-pressure gauge, 16-particle inlet.
Detailed Description
The invention is further described with reference to specific embodiments and drawings attached to the description.
The invention provides a solid aerosol generating device in an atmospheric boundary layer environment wind tunnel, which is characterized in that particles are continuously and stably added through a feeding system under a non-stop state, then enter a broadcasting system, are fully and uniformly mixed through airflow provided by the outside, are filtered through a filter screen, and finally flow out from a particle outlet.
Fig. 1 shows a schematic structural diagram of a solid aerosol generating device in an atmospheric boundary layer environment wind tunnel according to an embodiment of the present invention, the device mainly includes two parts, namely a feeding system and a spreading system, the feeding system is used for feeding materials without shutdown to realize continuous and stable aerosol release; the broadcasting system is used for fully and uniformly mixing the particles entering the broadcasting system and finally releasing the particles through the particle outlet.
As shown in fig. 2, the feeding system comprises a top cover 1, a gate valve 2, a funnel 3, an impeller pump 5 and a driving motor thereof from top to bottom in sequence, wherein the impeller pump 5 is connected with the broadcasting system through a pipeline. The particles are added into the feeding system from the top cover 1 and enter the broadcasting system through the gate valve 2, the funnel 3 and the impeller pump 5, and the feeding system can realize continuous and stable feeding without shutdown.
The top cover 1 is used for preventing particles from being sprayed when the gate valve 2 below is opened; the gate valve 2 is used to prevent dust from being ejected when particles are added.
The funnel 3 is provided with an observation window 4 for observing the particle residual quantity in the funnel 3 so as to add particles in time and maintain the device to continuously release the solid aerosol.
The feed rate and thus the feed rate of the aerosol can be controlled by the impeller pump 5.
As shown in fig. 2, the spreading system comprises a first air inlet 6, an air and particle mixture outlet 7, a particle flow channel 8, an air flow channel 9, an inner barrel 10, an inner barrel base 11, a filter screen 12, a second air inlet 13, an outer barrel 14, a pressure gauge 15, a particle inlet 16, wherein:
the inner barrel 10 is arranged on the inner barrel base 11, an air particle mixture flow channel is limited and formed between the inner barrel 10 and the inner barrel base 11, and the inner barrel 10 and the inner barrel base 11 are arranged in the outer barrel 14. A flow channel partition wall is arranged in the inner barrel 10, the flow channel partition wall divides the inner space of the inner barrel 10 into an air flow channel 9 and a particle flow channel 8 from inside to outside, and the air flow channel 9 is communicated with the bottom of the particle flow channel 8. The top end of the outer barrel 14 and the middle position of the top end of the inner barrel 10 are both provided with a first air inlet 6 and a particle inlet 16, and the first air inlet 6 and the particle inlet 16 are respectively communicated with the air flow channel 9 and the particle flow channel 8. The side wall of the inner barrel 10 is provided with a plurality of small holes, the top end of the outer barrel 14 close to the periphery is provided with two air and particle mixture outlets 7, and the air and particle mixture outlets 7 are communicated with an air particle mixture flow passage. Air and particles can enter the air flow channel 9 and the particle flow channel 8 from the first air inlet 6 and the particle inlet 16 respectively, and are mixed at the bottoms of the air flow channel 9 and the particle flow channel 8 to form a particle-air mixture; the particle-air mixture disperses within the inner barrel 10 and then flows out of the apertures in the side wall of the inner barrel 10 into the air particle mixture flow path and finally out of the top air and particle mixture outlet 7.
In this embodiment, a connecting channel is disposed in the middle of the flow channel partition wall to connect the air flow channel 9 and the particle flow channel 8. A part of the air entering from the first air inlet 6 can be separated via the connecting channel to the particle flow channel 8 for pre-blowing of agglomerated particles.
In this embodiment, the inner barrel 10 includes an upper section and a lower section, the upper section is cylindrical, the lower section is conical, and the sidewall of the upper section of the inner barrel 10 is provided with a plurality of small holes.
The middle position of the inner barrel base 11 and the bottom end of the outer barrel 14 is provided with a second air inlet 13, and the second air inlet 13 is communicated with the air particle mixture flow passage. Air can enter the air particle mixture flow passage from the second air inlet 13, mix with the particle-air mixture flowing out of the sidewall of the inner drum 10, and finally flow out of the air and particle mixture outlet 7.
In this embodiment, a filter screen 12 is disposed at the top end of the inner cylinder 10 inside the outer cylinder 14 for filtering out particles that do not meet the experimental requirements, so that the particles that meet the experimental requirements finally flow out from the outlet 7 of the mixture of air and particles.
In this embodiment, a pressure gauge 15 is disposed at the top end of the outer cylinder 14 for monitoring the internal pressure of the broadcasting system in real time.
As shown in fig. 3, the working principle of the solid aerosol generating device is as follows:
the cap 1 is opened and the particles are added to the feed system and, as the feed system is operated, the particles enter the broadcast system from the particle inlet 16. Air enters the air flow channel 9 and the air particle mixture flow channel from a first air inlet 6 at the top and a second air inlet 13 at the bottom of the spreading system respectively, wherein a part of the air entering from the first air inlet 6 is separated to the particle flow channel 8 through a connecting channel on a flow channel partition wall to pre-blow away agglomerated particles; then the particles and the air main flow part entering from the top are mixed at the bottoms of the air flow channel 9 and the particle flow channel 8 to form a particle air mixture; the particle-air mixture is first dispersed in the inner cylinder 10, then flows out of the small holes on the side wall of the inner cylinder 10 to the air particle mixture flow passage, and is mixed with the air flowing in from the second air inlet 13; finally, particles which do not meet the experimental requirements are filtered by a filter screen 12, and the particles which meet the experimental requirements respectively flow out from the two air and particle mixture outlets 7.
Examples
Silica aerosol particles with a median particle size of 1.8 micrometers, alumina aerosol particles with a median particle size of 11.8 micrometers and alumina aerosol particles with a median particle size of 99.8 micrometers are respectively released in the device, and as a result, as shown in fig. 4a to 4c, the median particle sizes are respectively 1.713 micrometers, 11.2 micrometers and 100.4 micrometers, which are closer to the median particle size of the adopted particles.
According to the solid aerosol generating device in the atmospheric boundary layer environment wind tunnel, particles are continuously and stably added through the feeding system under the non-stop state, then enter the broadcasting system, are fully and uniformly mixed through the airflow provided by the outside and combined with the internal structure, flow out from the small hole of the inner cylinder, enter the outer cylinder, pass through the filter screen, filter the particles which do not meet the experimental requirements, and finally flow out from the particle outlet. The device can continuously release solid aerosol, can adjust the concentration and the flow of particles, can screen aerosol particles, and has important significance for researching the diffusion and deposition characteristics of the environmental aerosol in a typical nuclear site and accurately predicting and evaluating the spatial distribution of the aerosol in the nuclear site.
The above-described embodiments are merely illustrative of the present invention, which may be embodied in other specific forms or in other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims should be construed to be included therein.
Claims (10)
1. The utility model provides a solid aerosol generating device in atmospheric boundary layer environment wind-tunnel which characterized in that, the device includes feed system and broadcast sowing system, wherein:
the feeding system comprises a top cover (1), a funnel (3), an impeller pump (5) and a driving motor thereof from top to bottom in sequence, and the lower end of the impeller pump (5) is connected with the broadcasting system through a pipeline;
the broadcasting system comprises an inner barrel (10), wherein the inner barrel (10) is arranged on an inner barrel base (11), an air particle mixture flow channel is limited and formed between the inner barrel (10) and the inner barrel base (11), and the inner barrel (10) and the inner barrel base (11) are arranged in an outer barrel (14);
a flow channel partition wall is arranged in the inner barrel (10), the flow channel partition wall divides the inner space of the inner barrel (10) into an air flow channel (9) and a particle flow channel (8) from inside to outside, and the air flow channel (9) is communicated with the bottom of the particle flow channel (8);
a first air inlet (6) and a particle inlet (16) are formed in the middle positions of the top end of the outer barrel (14) and the top end of the inner barrel (10), and the first air inlet (6) and the particle inlet (16) are respectively communicated with the air flow channel (9) and the particle flow channel (8); the side wall of the inner barrel (10) is provided with a plurality of small holes, the top end of the outer barrel (14) close to the periphery is provided with an air and particle mixture outlet (7), and the air and particle mixture outlet (7) is communicated with the air particle mixture flow passage.
2. The solid aerosol generating device in the wind tunnel of the atmospheric boundary layer environment of claim 1, wherein the rotating speed of the impeller pump (5) is adjustable, and the control of the feeding speed is realized by adjusting the rotating speed of the impeller pump (5).
3. The solid aerosol generating device in the wind tunnel of the atmospheric boundary layer environment of claim 2, characterized in that a gate valve (2) is arranged between the top cover (1) and the funnel (3) for preventing dust from being ejected when particles are added.
4. A solid aerosol generating device in an atmospheric boundary layer environment wind tunnel according to any one of claims 1 to 3, characterized in that the funnel (3) is provided with an observation window (4) for observing the residual amount of particles in the funnel (3) so as to add particles in time and maintain the device to release solid aerosol continuously.
5. The solid aerosol generating device in the wind tunnel of the atmospheric boundary layer environment of claim 1, wherein a connecting channel is arranged in the middle of the flow channel dividing wall, the air flow channel (9) and the particle flow channel (8) are communicated through the connecting channel, and a part of the air entering from the first air inlet (6) can be separated to the particle flow channel (8) through the connecting channel for pre-blowing agglomerated particles.
6. The solid aerosol generating device in the wind tunnel of the atmospheric boundary layer environment of claim 5, wherein a second air inlet (13) is formed at a position between the bottom ends of the inner barrel base (11) and the outer barrel (14), and the second air inlet (13) is communicated with the air particle mixture flow passage.
7. The solid aerosol generating device in the wind tunnel of the atmospheric boundary layer environment according to claim 6, characterized in that a filter screen (12) is arranged at the top end of the inner cylinder (10) in the outer cylinder (14) for filtering out particles which do not meet experimental requirements.
8. The solid aerosol generating device in an atmospheric boundary layer environment wind tunnel according to claim 1, characterized in that the number of the air and particle mixture outlets (7) is multiple.
9. The solid aerosol generating device in the wind tunnel of the atmospheric boundary layer environment according to any one of claims 5 to 8, wherein the inner barrel (10) comprises an upper section and a lower section, the upper section is cylindrical, the lower section is conical, and the side wall of the upper section of the inner barrel (10) is provided with a plurality of small holes.
10. The solid aerosol generating device in the wind tunnel of the atmospheric boundary layer environment according to claim 1, wherein a pressure gauge (15) is arranged at the top end of the outer cylinder (14) and used for monitoring the internal pressure of the spreading system in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211025495.4A CN115452661B (en) | 2022-08-25 | Solid aerosol generating device in atmospheric boundary layer environment wind tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211025495.4A CN115452661B (en) | 2022-08-25 | Solid aerosol generating device in atmospheric boundary layer environment wind tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115452661A true CN115452661A (en) | 2022-12-09 |
| CN115452661B CN115452661B (en) | 2024-10-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000111445A (en) * | 1998-10-05 | 2000-04-21 | Mitsubishi Heavy Ind Ltd | Particle-supplying device |
| KR20190000470A (en) * | 2017-06-23 | 2019-01-03 | 주식회사 에코픽쳐스 | Differential mobility analyzer and calibrating system for nano particle measuring device using thereof |
| CN109696287A (en) * | 2018-12-03 | 2019-04-30 | 中国辐射防护研究院 | A kind of atmospheric boundary layer environmental wind tunnel wet deposition simulator |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000111445A (en) * | 1998-10-05 | 2000-04-21 | Mitsubishi Heavy Ind Ltd | Particle-supplying device |
| KR20190000470A (en) * | 2017-06-23 | 2019-01-03 | 주식회사 에코픽쳐스 | Differential mobility analyzer and calibrating system for nano particle measuring device using thereof |
| CN109696287A (en) * | 2018-12-03 | 2019-04-30 | 中国辐射防护研究院 | A kind of atmospheric boundary layer environmental wind tunnel wet deposition simulator |
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