CN107121264B - A kind of experimental system and experimental method of micron particles and different surfaces collision - Google Patents
A kind of experimental system and experimental method of micron particles and different surfaces collision Download PDFInfo
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- CN107121264B CN107121264B CN201710466908.5A CN201710466908A CN107121264B CN 107121264 B CN107121264 B CN 107121264B CN 201710466908 A CN201710466908 A CN 201710466908A CN 107121264 B CN107121264 B CN 107121264B
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- 238000002474 experimental method Methods 0.000 title claims abstract description 23
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- 239000012159 carrier gas Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
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- 238000010438 heat treatment Methods 0.000 claims description 5
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- 239000010883 coal ash Substances 0.000 claims description 3
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- 239000011859 microparticle Substances 0.000 abstract 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 abstract 1
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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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
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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Abstract
A kind of experimental system and experimental method of the micron particles that temperature and humidity is controllable and different surfaces collision, belong to Dual-Phrase Distribution of Gas olid experimental provision.The experimental system mainly includes micron particles feed unit and the crash unit that is arranged in Laboratory Module, and micron particles feed unit provides carrier gas and the particle mixed of certain speed for crash unit.Crash unit includes impact platform and particle supply pipe, and thermocouple is equipped on the outer wall of particle supply pipe gas outlet and impact platform.Light source, quartz glass window, crash unit and high-speed camera are installed point-blank, high-speed camera mechatronics computer.The experimental provision can get incidence rate, ball rebound velocity and the critical collection speed when micron particles and different surfaces shock；It studies under different temperature and humidity, different materials and particles environment, energy dissipation mechanism when microparticle and different surfaces are hit；Experimental verification is provided for Dual-Phrase Distribution of Gas olid and the particles collision being related in industrial circle, particle deposition.
Description
Technical field
The present invention relates to the experimental systems and experiment side of a kind of micron particles that temperature and humidity is controllable and different surfaces collision
Method belongs to Dual-Phrase Distribution of Gas olid experimental provision technical field.
Background technique
Fine particle depositional phenomenon is present in the various fields such as the energy, environmental project, chemical industry, microelectronics and mechanical engineering.
On the one hand, fine grained deposition generally has negative effect, as heat exchanger tube superficial dust leads to heat transfer deterioration, translucent element in boiler
Upper dust stratification will cause luminous flux decline (such as solar-energy photo-voltaic cell output power reduction due to superficial dust), fine grained micro-
Deposition in Mechatronic Systems may cause mechanical breakdown or cause flow blockage, atmosphere fine grained in human respiratory tract/alveolar
Site deposition causes disease etc..On the other hand, fine grained deposition can be enhanced in practice, be with field of energy source power
Fine particle groups are polymerized to larger particles by additional sound field, magnetic field, electric field, chemical agglomeration process (also known as accumulation process) by example, from
And it effectively deposits and removes in conventional cloth bag or electrostatic precipitator.
It is above-mentioned to be mainly related to fine grain deposition problems in multiphase flow from macroscopic view using angle, to disclose these processes behind
Physical essence interacts between research fine grained from the force-displacement relationship formula of characterization micro-scale particles' interaction
Mechanism.The experiment relative difficult that two close partial size fine graineds contact with each other, therefore controllable micro- of contrived experiment temperature and humidity
Metrical scale particle and the experimental provision of different surfaces collision are to establish the necessary experimental basis of wet granular kinetic theory.
Summary of the invention
In order to overcome problems of the prior art, the present invention provide a kind of micron particles that temperature and humidity is controllable with not
It is micro- from characterizing for the physical essence for disclosing fine grain deposition in multiphase flow with the experimental system and experimental method of surface collision
The force-displacement relationship formula of particles' interaction is set out, and interaction mechanism between fine grained is studied.
The technical solution adopted by the present invention is that: a kind of experiment of the micron particles that temperature and humidity is controllable and different surfaces collision
System, it include a Laboratory Module, light source, high-speed camera and computer, the Laboratory Module include upper cover, experiment cabin and under
Lid is set in experiment cabin there are two opposite quartz glass window；It further includes a micron particles feed unit and one
A crash unit being arranged in Laboratory Module, the micron particles feed unit include carrier gas bottle, two mass flowmenters, one
A wet granular generator and a mixer, carrier gas bottle are occurred through a mass flowmenter, wet granular all the way by two-way pipeline
Device connects mixer, and another way connects mixer through another mass flowmenter, the carrier gas flowed out from mixer and micron order
Grain gaseous mixture is wound with the snake pipe connection crash unit of heat transmission belt；The crash unit includes that impact platform and particle supply
Pipe, the particle supply pipe being fixed on lid are connect with the snake pipe for being wound with heat transmission belt, in the outer of particle supply pipe gas outlet
Wall is equipped with the first thermocouple of connection temperature controller, and impact platform connects the cylindrical structure of electrical bar using lower end,
The outer wall of impact platform is equipped with the second thermocouple for connecting another temperature controller, and the electrical bar for connecting pressure regulator, which is located at, to be fixed
In ceramic tube in connector, it is connected by screw bolts between connector and lower cover；The light source, quartz glass window, shock
Unit and high-speed camera are installed point-blank, high-speed camera mechatronics computer.
The lower wall of the experiment cabin is equipped with aperture.
First thermocouple is arranged at the 0.5-1.5mm of particle supply pipe gas outlet outer wall, temperature controller control
The air outlet temperature of particle supply pipe is 220-240 DEG C.
Second thermocouple is arranged on the outer wall of impact platform at 0.5-1.5mm, and the pressure regulator controls electrical bar
Heating power, by temperature controller control impact platform temperature be 190-210 DEG C.
The cylinder diameter of the impact platform is 1.8-2.2mm.
A kind of controllable micron particles of temperature and humidity and the experimental method of different surfaces collision use following steps:
(1) the micro coal ash particle dried is put into wet granular generator；
(2) high-speed camera is connect with computer, changes Computer IP address；
(3) camera parameters are set with the high-speed camera of installation on computers included control software, such as resolution ratio is adopted
Sample rate and time for exposure, video camera triggering mode are delay triggering；
(4) focal length for adjusting high-speed camera, makes imaging clearly in shooting area, prepares shooting；
(5) check that the first thermocouple, the second thermocouple have reached set temperature value；
(6) air valve is opened, after adjusting air flow rate rapidly, after steady air current, shooting button is clicked, is shot；
(7) realtime graphic shown on computer is observed, after appropriate time, click stops clapping button, terminates record；
(8) playback button is clicked, the picture that has recorded is observed, if picture shows that particle is unintelligible or do not capture
Grain, then re-shoot, until capturing the particles hit planar surface process of imaging clearly；
(9) video of shooting is saved into computer, for subsequent image processing.
The beneficial effects of the present invention are: micron particles and the experimental system of different surfaces collision that this temperature and humidity is controllable
The main crash unit for including micron particles feed unit and being arranged in Laboratory Module, micron particles feed unit include to carry
Gas cylinder, two mass flowmenters, a wet granular generator and a mixer, provide the carrier gas of certain speed for crash unit
And particle mixed.Crash unit includes impact platform and particle supply pipe, is equipped on the outer wall of particle supply pipe gas outlet
First thermocouple；The outer wall of impact platform is equipped with the second thermocouple of connection.Light source, quartz glass window, crash unit and height
Fast video camera is installed point-blank, high-speed camera mechatronics computer.The main contents that the experimental provision can be studied
Are as follows: it can get incidence rate, ball rebound velocity and the critical collection speed when micron particles and different surfaces shock；Research is different
Under humidity, different temperatures, variable grain material and different-grain diameter particle environment, energy when micron particles and different surfaces are hit
Dissipation mechanism；Result of study can for Dual-Phrase Distribution of Gas olid and be related in industrial circle particles collision (such as: dedusting, dust stratification, filtering),
Particle deposition etc. provides infrastest verifying.
Detailed description of the invention
Fig. 1 is the experimental system figure of a kind of micron particles that temperature and humidity is controllable and different surfaces collision.
Fig. 2 is the structure chart of Laboratory Module.
In figure: 1, carrier gas bottle, 2, mass flowmenter, 3, wet granular generator, 4, mixer, 5, heat transmission belt, 6, temperature control
Device processed, the 7, first thermocouple, 7a, the second thermocouple, 8, light source, 9, electrical bar, 10, pressure regulator, 11, high-speed camera, 12, meter
Calculation machine, 13, upper cover, 14, experiment cabin, 14a, aperture, 15, quartz glass, 16, end cap, 17, lower cover, 18, connector, 19, pottery
Porcelain tube, 20, impact platform, 21, particle supply pipe.
Specific embodiment
The contents of the present invention are further described referring to the drawings.
Fig. 1,2 show experimental system figure and the experiment of a kind of micron particles that temperature and humidity is controllable and different surfaces collision
The structure chart in cabin.
In figure, the experimental system of the controllable micron particles of this temperature and humidity and different surfaces collision includes an experiment
Hitting in Laboratory Module is arranged in cabin, light source 8, high-speed camera 11,12, micron particles feed units of computer and one
Hit unit.Laboratory Module includes upper cover 13, experiment cabin 14 and lower cover 17, sets that there are two opposite quartzy glass in experiment cabin 14
Glass form and aperture 14a.
Micron particles feed unit includes the wet granular generator 3 of mass flowmenter 2, one of carrier gas bottle 1, two and one
Mixer 4, carrier gas bottle 1 connect mixer 4 through a mass flowmenter 2, wet granular generator 3 all the way, separately by two-way pipeline
All the way through another mass flowmenter 2 connect mixer 4, from mixer 4 flow out carrier gas and micron particles gaseous mixture pass through around
There is the snake pipe connection crash unit of heat transmission belt 5.
Crash unit includes impact platform 20 and particle supply pipe 21, be fixed on particle supply pipe 21 in upper cover 13 with around
There is the snake pipe of heat transmission belt 5 to connect, the first of connection temperature controller 6 is equipped on the outer wall of 21 gas outlet of particle supply pipe
Thermocouple 7, the first thermocouple 7 are arranged at the 1.0mm of 21 gas outlet outer wall of particle supply pipe, and temperature controller 6 controls particle
The air outlet temperature of supply pipe 21 is 230 DEG C.
Impact platform 20 uses the diameter of lower end connection electrical bar 9 for the cylindrical structure of 2.0mm, in impact platform 20
The outer of impact platform 20 is arranged in the second thermocouple 7a, the second thermocouple 7a that outer wall is equipped with another temperature controller 6 of connection
On wall at 1.0mm, the pressure regulator 10 controls the heating power of electrical bar 9, and the temperature of impact platform 20 is controlled by temperature controller 6
Degree is 200 DEG C.
The electrical bar 9 of connection pressure regulator 10 is located in the ceramic tube 19 being fixed in connector 18, connector 18 and lower cover
It is connected by screw bolts between 17.Light source 8, quartz glass window, crash unit and high-speed camera 11 are installed point-blank,
High-speed camera 11 is electrically connected computer 12.
The controllable micron particles of this temperature and humidity and the experimental method of different surfaces collision use following steps:
(1) the micro coal ash particle dried is put into wet granular generator；
(2) high-speed camera 11 is connect with computer 12, changes Computer IP address；
(3) camera parameters are set with the high-speed camera 11 of installation on the computer 12 included control software, such as differentiate
Rate, sample rate and time for exposure, video camera triggering mode are delay triggering；
(4) focal length for adjusting high-speed camera 11, makes imaging clearly in shooting area, prepares shooting；
(5) check that the first thermocouple 7, the second thermocouple 7a have reached set temperature value；
(6) air valve is opened, after adjusting air flow rate rapidly, after steady air current, shooting button is clicked, is shot；
(7) realtime graphic shown on computer 12 is observed, after appropriate time, click stops clapping button, terminates record；
(8) playback button is clicked, the picture that has recorded is observed, if picture shows that particle is unintelligible or do not capture
Grain, then re-shoot, until capturing the particles hit planar surface process of imaging clearly；
(9) video of shooting is saved into computer 12, for subsequent image processing.
Using above-mentioned technical solution, experimental system is by micron particles feed unit and the shock being arranged in Laboratory Module
Unit composition.The carrier gas of micron particles can be the gaseous mixture of nitrogen, carbon dioxide, air or more than one gases, carrier gas
It is divided into two-way, accurately controls its flow by mass flowmenter respectively.It is all the way dry gas, another way is installed by BGI company of the U.S.
The wet granular generator 3 of development generates humid gas；Two-way gas enters the mixing of installation hygronom (range 0-100%)
Container, the flow of two-way gas can be efficiently controlled by mass flowmenter, to realize that the humidity of gas in mixing vessel obtains
To effective control, crash unit gas vent flow velocity reaches as high as 20m/s.In addition, to gaseous mixture back segment air flow system using biography
The torrid zone can be heated, and crash unit gas vent nearby installs the temperature of High Accuracy Thermocouple Temperature measurement air-flow, pass through temperature
Controller, pressure regulator adjust the power of heat transmission belt, and air-flow maximum heating temperature efficiently controls gas up to 230 DEG C, to realize
The temperature of stream.
The core of crash unit is impact platform, to consider that platform surface characteristic and platform material can all touch particle
The reason that collides has an impact, by the cylindrical body that impact platform is designed to detachable, replacement, diameter is 2mm, using heating rod to cylinder
Body is heated, to transfer heat to the impact platform that diameter is 2mm.Thermoelectricity is installed at impingement distance platform surface 1mm
Its temperature occasionally is detected, the power of electrically heated rod is adjusted by temperature controller, pressure regulator, impact platform maximum temperature is up to 200
DEG C, impact platform temperature is efficiently controlled to realize.
High speed video system is made of high-speed camera, point light source, fixed-focus microlens and computer, by video camera and meter
Calculation machine is connected, to store shooting video.High speed video system can be clearly captured the mistake that partial size is 2 μm or more particles hit plates
Journey.
The temperature and humidity of experimental system passes through number device for picking and stores and show, it can be achieved that air velocity in real time on computers
Control is in 0.5m/s-20m/s, and airflow temperature-control is at 230 DEG C, and the control of impact platform temperature is at 200 DEG C, replaceable unlike material
Platform, to realize under temperature and humidity controlled condition, the experimental study that micron particles and different surfaces are hit works, and can have
Deposition process, heat exchanger tube when effect simulation flue endoparticle deposition process, electrostatic precipitator endoparticle arrival collecting plate
The actual industrial process such as superficial dust, while the theoretical research for particle and plate impact process provides effective support.
Claims (6)
1. the experimental system of a kind of micron particles that temperature and humidity is controllable and different surfaces collision, it includes Laboratory Module, a light
Source (8), high-speed camera (11) and computer (12), the Laboratory Module include upper cover (13), experiment cabin (14) and lower cover
(17), opposite quartz glass window there are two being set in experiment cabin (14)；It is characterized in that: further comprising a micron orders
A grain feed unit and crash unit being arranged in Laboratory Module, the micron particles feed unit include carrier gas bottle (1),
Two mass flowmenters (2), a wet granular generator (3) and a mixer (4), carrier gas bottle (1) is by two-way pipeline, and one
Lu Jingyi mass flowmenter (2), wet granular generator (3) connection mixer (4), another way is through another mass flowmenter
(2) mixer (4) are connected, the carrier gas flowed out from mixer (4) is wound with the snakelike of heat transmission belt (5) with micron particles gaseous mixture
Pipeline connects crash unit；The crash unit includes impact platform (20) and particle supply pipe (21), is fixed on upper cover (13)
On particle supply pipe (21) connect with the snake pipe for being wound with heat transmission belt (5), the outer wall in particle supply pipe (21) gas outlet
It is equipped with the first thermocouple (7) of connection temperature controller (6), impact platform (20) connects the circle of electrical bar (9) using lower end
Column structure is equipped with the second thermocouple (7a) for connecting another temperature controller (6), connection on the outer wall of impact platform (20)
The electrical bar (9) of pressure regulator (10) is located in the ceramic tube (19) being fixed in connector (18), connector (18) and lower cover
(17) it is connected by screw bolts between；The light source (8), quartz glass window, crash unit and high-speed camera (11) are mounted on
On straight line, high-speed camera (11) is electrically connected computer (12).
2. the experimental system of a kind of controllable micron particles of temperature and humidity according to claim 1 and different surfaces collision,
It is characterized in that: the lower wall of experiment cabin (14) is equipped with aperture (14a).
3. the experimental system of a kind of controllable micron particles of temperature and humidity according to claim 1 and different surfaces collision,
It is characterized in that: first thermocouple (7) is arranged at the 0.5-1.5mm of particle supply pipe (21) gas outlet outer wall, temperature control
The air outlet temperature of device (6) control particle supply pipe (21) processed is 220-240 DEG C.
4. the experimental system of a kind of controllable micron particles of temperature and humidity according to claim 1 and different surfaces collision,
It is characterized in that: second thermocouple (7a) is arranged on the outer wall of impact platform (20) at 0.5-1.5mm, the pressure regulator
(10) heating power for controlling electrical bar (9) is 190-210 DEG C by the temperature of temperature controller (6) control impact platform (20).
5. the experimental system of a kind of controllable micron particles of temperature and humidity according to claim 1 and different surfaces collision,
It is characterized in that: the cylinder diameter of the impact platform (20) is 1.8-2.2mm.
6. the experimental method of a kind of micron particles that temperature and humidity is controllable and different surfaces collision, the experimental method are wanted using right
Experimental system described in asking 1 is realized, it is characterized in that: using following steps:
(1) the micro coal ash particle dried is put into wet granular generator；
(2) high-speed camera (11) is connect with computer (12), changes Computer IP address；
(3) it with the included control software setting camera parameters of the high-speed camera (11) being mounted on computer (12), such as differentiates
Rate, sample rate and time for exposure, video camera triggering mode are delay triggering；
(4) focal length for adjusting high-speed camera (11), makes imaging clearly in shooting area, prepares shooting；
(5) check that the first thermocouple (7), the second thermocouple (7a) have reached set temperature value；
(6) air valve is opened, after adjusting air flow rate rapidly, after steady air current, shooting button is clicked, is shot；
(7) realtime graphic shown on computer (12) is observed, after appropriate time, click stops clapping button, terminates record；
(8) playback button is clicked, the picture recorded is observed, if picture shows that particle is unintelligible or does not capture particle,
It re-shoots, until capturing the particles hit planar surface process of imaging clearly；
(9) video of shooting is saved into computer (12), for subsequent image processing.
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| CN201710466908.5A CN107121264B (en) | 2017-06-20 | 2017-06-20 | A kind of experimental system and experimental method of micron particles and different surfaces collision |
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