CN113954364A - Micron or nanometer aerosol particle enrichment device - Google Patents
Micron or nanometer aerosol particle enrichment device Download PDFInfo
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- CN113954364A CN113954364A CN202111109559.4A CN202111109559A CN113954364A CN 113954364 A CN113954364 A CN 113954364A CN 202111109559 A CN202111109559 A CN 202111109559A CN 113954364 A CN113954364 A CN 113954364A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
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- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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Abstract
The invention belongs to the technical field of aerosol enrichment, and discloses a micron or nanometer aerosol particle enrichment device which comprises an aerosol particle sample adding micro-channel, an aerosol particle enrichment micro-channel and a sheath airflow micro-channel; the airflow outlet side of the aerosol particle sample feeding micro-channel is connected with the airflow inlet side of the aerosol particle enrichment micro-channel; the side wall of the aerosol particle enrichment micro-channel is provided with a through hole, and the through hole is connected with the airflow outlet side of the sheath airflow micro-channel; a preset included angle is formed between the sheath airflow microchannel and the aerosol particle enrichment microchannel, the preset included angle is an acute angle, and the airflow inlet side of the sheath airflow microchannel extends along the direction from the aerosol particle sample adding microchannel to the aerosol particle enrichment microchannel. Through setting up reverse sheath air current microchannel, make micron or nanometer aerosol granule move to aerosol granule enrichment microchannel's central point fast and put, realize high-efficient enrichment, have very important meaning to promoting 3D printing precision, improving the part performance of receiving a little.
Description
Technical Field
The invention belongs to the technical field of aerosol enrichment, and relates to a micron or nanometer aerosol particle enrichment device.
Background
The micron or nanometer aerosol particles are effectively enriched and have important application in the fields of ink-jet printing, environmental monitoring, biomedicine and the like. If 3D prints the vibration material disk based on micron or nanometer aerosol granule, can be used to prepare high accuracy and receive the structure and microcircuit printing a little, improve the enrichment precision of aerosol, to promoting printing precision, improve receive the part performance a little and have very important meaning.
At present, the enrichment method of micron or nanometer aerosol particles is mainly realized by using a positive sheath gas or an aerodynamic lens to enable the aerosol particles to be subjected to a radial drag force with a large angle and pointing to the center of a channel. The principle of the method is simple, but the defects that the channel is needed to be long, the enrichment precision is not high, aerosol particles are easy to deposit and the like exist, and the reason is that when the hydraulic diameter of the enrichment channel is small, the wall surface of the channel has high sliding speed, so that the velocity gradient in the channel is not high, lateral acting forces such as Saffman lifting force and the like on the aerosol particles are weak, and the high-precision enrichment of the aerosol particles in a short channel length cannot be realized.
In summary, in view of the important application value and potential of the micro-or nano-aerosol particles, and the prior art cannot realize high-precision and high-efficiency enrichment of the micro-or nano-aerosol particles, the development of a high-efficiency and high-precision micro-or nano-aerosol particle enrichment device and method is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of low precision and efficiency of micron or nanometer aerosol particle enrichment in the prior art and provide a micron or nanometer aerosol particle enrichment device.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a micron or nanometer aerosol particle enrichment device comprises an aerosol particle sample adding micro-channel, an aerosol particle enrichment micro-channel and at least two sheath airflow micro-channels; the airflow outlet side of the aerosol particle sample feeding micro-channel is connected with the airflow inlet side of the aerosol particle enrichment micro-channel; the side wall of the aerosol particle enrichment micro-channel is provided with at least two through holes, and the through holes are connected with the airflow outlet side of the sheath airflow micro-channel; a preset included angle is formed between the sheath airflow microchannel and the aerosol particle enrichment microchannel, the preset included angle is an acute angle, the airflow inlet side of the sheath airflow microchannel extends along the direction from the aerosol particle sample adding microchannel to the aerosol particle enrichment microchannel, and the sheath airflow microchannels are symmetrically distributed along the axis of the aerosol particle enrichment microchannel.
The invention further improves the following steps:
the sheath airflow microchannel is of a tapered structure, and the width of the airflow inlet side channel of the sheath airflow microchannel is larger than that of the airflow outlet side channel.
The preset included angle is 1-5 degrees.
The preset included angle is 2 degrees.
The aerosol particle sample adding micro-channel and the aerosol particle enrichment micro-channel are integrally formed.
The through hole is formed at the joint of the aerosol particle enrichment micro-channel and the aerosol particle sample feeding micro-channel.
The channel width of the aerosol particle enrichment micro-channel is 1-10 mu m; the through holes are rectangular through holes, and the channel width of each rectangular through hole is 1-10 mu m.
The aerosol particle sample adding microchannel and the aerosol particle enrichment microchannel are constant-section channels.
The sheath airflow microchannels at least comprise two pairs, each pair of sheath airflow microchannels are symmetrically distributed along the axis of the aerosol particle enrichment microchannel, and the pairs of sheath airflow microchannels are sequentially arranged along the direction from the aerosol particle loading microchannel to the aerosol particle enrichment microchannel.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a micron or nanometer aerosol particle enrichment device, which is characterized in that at least two through holes are formed in the side wall of an aerosol particle enrichment microchannel, the through holes are connected with the airflow outlet side of a sheath airflow microchannel, a preset included angle is arranged between the sheath airflow microchannel and the aerosol particle enrichment microchannel, the preset included angle is an acute angle, the airflow inlet side of the sheath airflow microchannel extends along the direction from an aerosol particle loading microchannel to the aerosol particle enrichment microchannel, so that the direction of sheath airflow in the sheath airflow microchannel is opposite to the direction of airflow in the aerosol particle enrichment microchannel, a speed zero point is formed in the aerosol particle enrichment microchannel by adopting the reverse sheath airflow microchannel, the speed gradient of aerosol particles in the aerosol particle enrichment microchannel is obviously enhanced, and the Saffman lifting force effect of the aerosol particles in the aerosol particle enrichment microchannel is greatly enhanced, meanwhile, the reverse sheath airflow has an obvious extrusion effect on aerosol particles, and under the action of the reverse sheath airflow, the micron or nanometer aerosol particles quickly move to the central position of the aerosol particle enrichment microchannel to realize efficient enrichment.
Furthermore, the preset included angle formed between the sheath airflow micro-channel and the aerosol particle enrichment micro-channel is 2 degrees, so that the influence range of the sheath airflow on the airflow outlet side of the sheath airflow micro-channel is wider.
Furthermore, the sheath airflow microchannel is of a gradually-reduced structure, and the width of the airflow inlet side channel of the sheath airflow microchannel is larger than that of the airflow outlet side channel, so that the sheath airflow can be accelerated, and the influence range of the sheath airflow entering the channel is larger.
Further, the channel width of the aerosol particle loading microchannel and the aerosol particle enrichment microchannel is in a micron or nanometer scale. Specifically, the channel width of the aerosol particle enrichment micro-channel is 1-10 μm; the channel width of the through hole is 1-10 mu m. Small-scale aerosol particle loading microchannels and aerosol particle enrichment microchannels can induce higher velocity gradients, resulting in greater saffman forces experienced by the particles.
Furthermore, the aerosol particle sample adding micro-channel and the aerosol particle enrichment micro-channel are integrally formed, and processing and manufacturing are facilitated.
Furthermore, the aerosol particle sample-adding micro-channel and the aerosol particle enrichment micro-channel are constant-section channels, so that particle collision at the position, close to the wall surface, of the channels can be reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of a micro-or nano-aerosol particle enrichment device according to the present invention;
FIG. 2 is a schematic diagram of the structure of a micro-or nano-aerosol particle concentration device with multiple pairs of reverse sheath flow structures according to the present invention;
FIG. 3 is a schematic diagram of the enrichment effect of the micron or nanometer aerosol particle enrichment device of the present invention;
FIG. 4 shows an embodiment of the present invention with a total flow of 1.25 x 10-5Comparing the results of the enrichment bandwidth numerical simulation of the forward sheath airflow and the reverse sheath airflow at the outlet end of the enrichment device in kg/s;
FIG. 5 shows an embodiment of the present invention with a total flow of 3.375 x 10-5And (3) comparing the results of the numerical simulation of the enrichment bandwidths of the forward sheath airflow and the reverse sheath airflow at the outlet end of the enrichment device in kg/s.
Wherein: 1-aerosol particle loading microchannel; 2-aerosol particle enrichment microchannel; 3-sheath airflow microchannel.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, in an embodiment of the present invention, a micron or nanometer aerosol particle enrichment apparatus is provided for solving the problems of low enrichment precision, poor micron/nanometer particle enrichment effect and easy deposition in the existing enrichment apparatus. Specifically, the micron or nanometer aerosol particle enrichment device comprises an aerosol particle loading micro-channel 1, an aerosol particle enrichment micro-channel 2 and at least two sheath airflow micro-channels 3; the airflow outlet side of the aerosol particle sample feeding micro-channel 1 is connected with the airflow inlet side of the aerosol particle enrichment micro-channel 2; the side wall of the aerosol particle enrichment micro-channel 2 is provided with at least two through holes, and the through holes are connected with the airflow outlet side of the sheath airflow micro-channel 3; a preset included angle is formed between the sheath airflow microchannel 3 and the aerosol particle enrichment microchannel 2, the preset included angle is an acute angle, the airflow inlet side of the sheath airflow microchannel 3 extends along the direction from the aerosol particle sample adding microchannel 1 to the aerosol particle enrichment microchannel 2, and the sheath airflow microchannels 3 are symmetrically distributed along the axis of the aerosol particle enrichment microchannel 2.
Because the width of the channel of the aerosol particle loading micro-channel 1 and the aerosol particle enrichment micro-channel 2 is generally smaller, the wall surface of the channel has obvious speed slippage, which can weaken the speed gradient in the aerosol particle loading micro-channel 1 and the aerosol particle enrichment micro-channel 2, and the Saffman force of the aerosol particles, which points to the center of the channel, is reduced. By arranging the sheath airflow microchannel 3, the flow direction of the sheath airflow channel 3 is opposite to that of the airflow in the aerosol particle sample adding microchannel 1 and the aerosol particle enrichment microchannel 2, so that a speed zero point is formed in the aerosol particle enrichment microchannel 2, the speed gradient in the aerosol particle enrichment microchannel is obviously increased, and the Saffman lifting effect on aerosol particles is greatly enhanced; under the action of the sheath airflow micro-channel 3, the aerosol particles at micron/nanometer level rapidly move to the central position of the aerosol particle enrichment micro-channel 2, and efficient enrichment is realized.
The device for efficiently enriching the micron or nanometer aerosol particles can realize high-precision and efficient enrichment of the micron or nanometer aerosol particles, and has the following working principle:
in the aerosol particle loading microchannel 1, high-speed airflow carries micron/nanometer level aerosol particles to flow, the aerosol particles lag behind the airflow, although a certain speed slippage exists on the wall surface, the microchannel with small channel width and high dynamic flow speed still forms a high speed gradient, and due to the high speed difference between the aerosol particles and the airflow and the high speed gradient, the aerosol particles are influenced by strong Saffman force pointing to the center of the aerosol particle loading microchannel 1.
When the aerosol particle enrichment microchannel 2 moves, the reverse sheath airflow in the sheath airflow microchannel 3 and the airflow in the aerosol particle enrichment microchannel 2 are mutually extruded, and the aerosol particles are subjected to a drag force F directed to the center of the aerosol particle enrichment microchannel 2dMeanwhile, the velocity difference between the reverse sheath airflow and the airflow in the aerosol particle enrichment micro-channel 2 is larger, a velocity zero point is formed near the airflow outlet side of the sheath airflow micro-channel 3, a higher velocity gradient is generated in the aerosol particle enrichment micro-channel 2, and the aerosol particles are subjected to the Saffman lifting force F pointing to the center of the aerosol particle enrichment micro-channel 2sThe concentration of the aerosol particles is stronger, so that the aerosol particles rapidly move to the center of the aerosol particle enrichment micro-channel 2, high-precision and high-efficiency enrichment of micron or nanometer aerosol particles is realized, and the method has important application value and potential in the fields of aerosol jet printing, environmental detection and the like.
In summary, the micron or nanometer aerosol particle enrichment device of the invention adopts the reverse sheath airflow microchannel to form a velocity zero point in the aerosol particle enrichment microchannel 2, so as to significantly enhance the velocity gradient of aerosol particles in the aerosol particle enrichment microchannel 2, and greatly enhance the saveman lifting force effect of aerosol particles in the aerosol particle enrichment microchannel 2, meanwhile, the reverse sheath airflow has an obvious extrusion effect on aerosol particles, and the micron or nanometer aerosol particles rapidly move to the central position of the aerosol particle enrichment microchannel 2 under the action of the reverse sheath airflow, so as to realize high-efficiency enrichment.
Meanwhile, the flowing directions of the air flows in the sheath air flow micro-channel 3 and the aerosol particle sample adding micro-channel 1 and the aerosol particle enrichment micro-channel 2 are opposite, the air in the sheath air flow micro-channel and the air in the aerosol particle enrichment micro-channel 2 are mutually extruded to form air flow pointing to the center of the aerosol particle enrichment micro-channel 2, the dragging force pointing to the center of the aerosol particle enrichment micro-channel 2 is formed when the air flow acts on aerosol particles, the lateral movement of the aerosol particles is enhanced, and the high-efficiency and high-precision enrichment of the aerosol particles is realized. And the action of the reverse sheath airflow enables a speed zero point to be formed in the aerosol particle enrichment micro-channel 2, the speed gradient from the center of the channel in the aerosol particle enrichment micro-channel 2 to the speed zero point is obviously increased, the Saffman lifting force action on aerosol particles is greatly enhanced, the speed zero point is artificially arranged in the aerosol particle enrichment channel 2, the speed gradient is obviously increased, the lateral migration force on the particles is stronger, the aerosol particles are driven to efficiently move laterally to the axis of the aerosol particle enrichment micro-channel 2, and the high-precision enrichment of the particles in a shorter channel length is facilitated. Meanwhile, the reverse sheath airflow has an extrusion effect on aerosol particles, so that the aerosol particles are prevented from attaching to the wall, the lateral migration of the aerosol particles to the center of the aerosol particle enrichment microchannel 2 is accelerated, the aerosol particles enter the aerosol particle enrichment microchannel 2 through airflow and are influenced by a drag force at the front end, the aerosol particles flow to an outlet in the aerosol particle enrichment microchannel 2, and the aerosol particles are quickly enriched to the center of the aerosol particle enrichment microchannel 2 through the larger Saffman force influence caused by the velocity gradient and the velocity difference between gas and particles and the drag force influence of the symmetric pointing to the center caused by the sheath airflow in the aerosol particle enrichment microchannel 2 and are finally sprayed out through the outlet end, so that the enrichment of the aerosol particles is realized.
Preferably, the sheath airflow micro-channel 3 is a tapered structure, and the width of the airflow inlet side channel of the sheath airflow micro-channel 3 is greater than the width of the airflow outlet side channel, so that the sheath airflow can be accelerated, and the influence range of the sheath airflow entering the channel is larger.
Preferably, the preset included angle formed between the sheath airflow microchannel 3 and the aerosol particle enrichment microchannel 2 is 2 °, so that the influence range of the sheath airflow on the airflow outlet side of the sheath airflow microchannel 3 is wider, symmetrical extrusion flow can be formed near the airflow outlet side of the sheath airflow microchannel 3, aerosol particles are dragged to move towards the center of the aerosol particle enrichment microchannel 2, and the direction points to the center of the aerosol particle enrichment microchannel 2.
Preferably, the channel widths of aerosol particle loading microchannel 1 and aerosol particle enrichment microchannel 2 are in the micrometer or nanometer scale. Specifically, the channel width of the aerosol particle enrichment micro-channel 2 is 1-10 μm; the through holes are rectangular through holes, and the channel width of each rectangular through hole is 1-10 mu m. The small-scale aerosol particle loading microchannel 1 and aerosol particle enrichment microchannel 2 can cause a higher velocity gradient, so that the particles are subjected to a greater saffmann force.
Preferably, the aerosol particle sample feeding micro-channel 1 and the aerosol particle enrichment micro-channel 2 are integrally formed, so that the processing and the manufacturing are convenient.
Preferably, the through hole is arranged at the connection position of the aerosol particle enrichment micro-channel 2 and the aerosol particle sample feeding micro-channel 1.
Preferably, the aerosol particle sample-adding microchannel 1 and the aerosol particle enrichment microchannel 2 are constant-section channels, so that particle collision at the position of the channel close to the wall surface can be reduced.
Preferably, referring to fig. 2, the sheath gas flow microchannels 3 comprise at least two pairs, each pair of sheath gas flow microchannels 3 is symmetrically distributed along the axis of the aerosol particle-enriched microchannel 2, and each pair of sheath gas flow microchannels 3 is arranged in sequence from the aerosol particle loading microchannel 1 to the aerosol particle-enriched microchannel 2.
Example 1
In this embodiment, two sheath airflow microchannels 3 are provided, and the two sheath airflow microchannels 3 are symmetrically arranged outside the aerosol particle-enriched microchannel 2, and are used for forming symmetrical airflow pointing to the center of the aerosol particle-enriched microchannel 2 and speed zero points near the through hole in the aerosol particle-enriched microchannel 2. Aerosol particle application of sample microchannel 1 and aerosol particle enrichment microchannel 2 all adopt the constant cross section passageway of little channel width, and sheath airflow direction in sheath airflow microchannel 3 is opposite with the airflow direction in aerosol particle application of sample microchannel 1 and aerosol particle enrichment microchannel 2 to there is 2 contained angles, makes sheath airflow influence scope more extensive, and makes the pressure variation near 3 exports of sheath airflow microchannel more gentle than forward sheath airflow, reduces the granule and bumps the wall loss.
The specific verification process comprises the following steps: in this embodiment, a specific operation of printing 100nm aerosol particles is taken as an example. Wherein, the length of the aerosol particle sample-loading micro-channel 1 is 2mm, the length of the aerosol particle enrichment micro-channel 2 is 2mm, the channel width of the aerosol particle enrichment micro-channel 2 is 1 μm, the width of the airflow outlet side channels of the two sheath gas micro-channels 3 is 1 μm, and the total flow is 1.25 x 10-5 kg/s; the micron or nanometer aerosol particles of the aerosol particle loading micro-channel 1 are carried by the airflow and enter the aerosol particle enrichment micro-channel 2 through the inlet end of the aerosol particle enrichment micro-channel 2, and due to the inertia difference, the aerosol particles lag behind the airflow and are subjected to the drag force F from the inlet end to the outlet end of the aerosol particle loading micro-channel 1dThe action of (1) is accelerated continuously, and meanwhile, because the channel width of the aerosol particle loading micro-channel 1 is smaller, although a certain slippage exists on the wall surface, the aerosol particle still has a very high velocity gradient under the same air velocity, so that the aerosol particle is subjected to a lateral Saffman lifting force F pointing to the center of the aerosol particle loading micro-channel 1s. When the aerosol particles move to the aerosol particle enrichment micro-channel 2, the extrusion flow formed by the lateral reverse sheath airflow and the airflow in the aerosol particle enrichment micro-channel 2 acts on the aerosol particles, namely the drag force F pointing to the center of the aerosol particle enrichment micro-channel 2dOn the other hand, the sheath airflow and the airflow of the aerosol particle-enriched microchannel 2 are opposite in direction, and a velocity zero point is formed therebetween, resulting in a higher velocity gradient, so that the saffman force Fs directed to the center of the aerosol particle-enriched microchannel 2 is higher, and particles move more efficiently to the vicinity of the central axis of the aerosol particle-enriched microchannel 2Thereby realizing the high-efficiency and high-precision enrichment of micron or nanometer aerosol particles in a short time.
Referring to fig. 3, it can be seen that the particles tend to move toward the center at the front end of the aerosol particle loading microchannel 1 due to the high velocity gradient and the savoman force caused by the gas and particle velocity difference, but are still scattered in the whole aerosol particle loading microchannel 1. When the particles move to the aerosol particle enrichment microchannel 2, due to the combined action of the drag force and the Saffman force, the particles obviously move to the center of the aerosol particle enrichment microchannel 2, micron or nanometer aerosol particles are rapidly enriched to the vicinity of the central axis of the aerosol particle enrichment microchannel 2, and due to the symmetrical airflow action of the extrusion flow, the aerosol particles are finally kept in the vicinity of the central axis of the aerosol particle enrichment microchannel 2; finally, the aerosol particles enriched with high precision are ejected from the nozzle outlet and are incident on a printed substrate to realize different functions, such as microstructure processing or circuit printing.
Example 2
The principle of this embodiment is basically the same as that of the above embodiment, and in this embodiment, the influence of different sheath airflow structures on the enrichment of aerosol particles is verified, for example: a forward sheath flow and a reverse sheath flow. Referring to fig. 4, a graph of the numerical simulation result of the outlet enrichment bandwidths of the aerosol particle enrichment microchannels 2 of the micro-sized or nano-sized aerosol particles in the forward sheath airflow and the reverse sheath airflow under the condition of the same sheath airflow ratio and flow rate is shown, and it can be seen from fig. 4 that the aerosol particle enrichment microchannels 2 of the reverse sheath airflow structure have more obvious enrichment effect on the aerosol particles because the reverse sheath airflow provides a velocity zero point near the sheath airflow inlet, resulting in a stronger velocity gradient, so that the sammann force directed to the center of the channel is larger for the particles, and meanwhile, the reverse sheath airflow also improves the pressure change near the sheath airflow inlet, so that the pressure change near the sheath airflow inlet is more gradual.
The flow was further increased to verify the effect of different sheath flow structures on the enrichment of micro-or nano-aerosol particles at a larger flow rate, see fig. 5, using 3.375 x 10-5Total flow in kg/s, it can be seen that the reverse sheath flow has a better improvement in enrichment bandwidth than the forward sheath flow for the same sheath flow ratio.
In the research process of micron or nanometer aerosol particle enrichment, the enrichment research of micron/nanometer aerosol particles aiming at the condition of forward sheath airflow with a conventional structure firstly finds that the enrichment effect of the forward sheath airflow on submicron particles is not good in small size, mainly because a section of high-pressure area is formed near a forward sheath airflow inlet, so that aerosol particles at the position need to bypass the high-pressure area in the drag force direction and point to the wall surface of an aerosol particle enrichment microchannel 2, the problem of aerosol particle wall contact and deposition is serious, the enrichment condition of aerosol particles which do not contact the wall and are deposited at the rear half section of the channel is still not ideal, and even if the flow rate is adjusted and the sheath airflow ratio is not well improved.
In order to break through the bottleneck problem of high-efficiency and high-precision enrichment of micron or nanometer aerosol particles of the conventional forward sheath airflow, the mechanism of the lateral migration of the particles is deeply analyzed, and the problem that the pressure change in a high-pressure region and the front section of an enrichment channel is severe can be remarkably improved if reverse sheath airflow is used, so that the drag force of the airflow on the micron or nanometer aerosol particles is directed to the center of an aerosol particle enrichment microchannel 2, and because a speed zero point is artificially set between the sheath airflow and the airflow in the aerosol particle enrichment microchannel 2, the speed gradient near the inlet of the aerosol particle enrichment microchannel 2 can be greatly improved, so that the effect of the Saffman lifting force directed to the center of the aerosol particle enrichment microchannel 2 on the particles is more obvious, and the high-precision and high-efficiency enrichment of the micron or nanometer aerosol particles is further realized.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. A micron or nanometer aerosol particle enrichment device is characterized by comprising an aerosol particle loading micro-channel (1), an aerosol particle enrichment micro-channel (2) and at least two sheath airflow micro-channels (3);
the airflow outlet side of the aerosol particle sample feeding micro-channel (1) is connected with the airflow inlet side of the aerosol particle enrichment micro-channel (2); the side wall of the aerosol particle enrichment micro-channel (2) is provided with at least two through holes, and the through holes are connected with the airflow outlet side of the sheath airflow micro-channel (3); a preset included angle is arranged between the sheath airflow micro-channel (3) and the aerosol particle enrichment micro-channel (2), the preset included angle is an acute angle, the airflow inlet side of the sheath airflow micro-channel (3) extends along the direction from the aerosol particle sample adding micro-channel (1) to the aerosol particle enrichment micro-channel (2), and the sheath airflow micro-channels (3) are symmetrically distributed along the axis of the aerosol particle enrichment micro-channel (2).
2. A micro-or nano-aerosol particle enrichment device according to claim 1, characterized in that the sheath gas flow micro-channels (3) are tapered structures, the gas flow inlet side channel width of the sheath gas flow micro-channels (3) being larger than the gas flow outlet side channel width.
3. The micro-or nano-aerosol particle enrichment device of claim 1, wherein the predetermined included angle is 1 ° to 5 °.
4. A micro or nano aerosol particle enrichment device according to claim 1, characterized in that the preset included angle is 2 °.
5. Micro-or nano-aerosol particle enrichment device according to claim 1, characterized in that the aerosol particle loading micro-channel (1) and the aerosol particle enrichment micro-channel (2) are integrated.
6. Micro-or nano-aerosol particle enrichment device according to claim 1, characterized in that the through-holes are provided at the connection of the aerosol particle enrichment micro-channel (2) and the aerosol particle loading micro-channel (1).
7. A micro-or nano-aerosol particle enrichment device according to claim 1, characterized in that the channel width of the aerosol particle enrichment micro-channel (2) is 1-10 μm; the through holes are rectangular through holes, and the channel width of each rectangular through hole is 1-10 mu m.
8. A micro-or nano-aerosol particle enrichment device according to claim 1, characterized in that the aerosol particle loading micro-channel (1) and the aerosol particle enrichment micro-channel (2) are both constant cross-section channels.
9. A micro-or nano-aerosol particle enrichment device according to claim 1, characterized in that the sheath gas flow microchannels (3) comprise at least two pairs, each pair of sheath gas flow microchannels (3) being symmetrically distributed along the axis of the aerosol particle enrichment microchannel (2), and each pair of sheath gas flow microchannels (3) being arranged in sequence in the direction from the aerosol particle loading microchannel (1) to the aerosol particle enrichment microchannel (2).
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| US4977785A (en) * | 1988-02-19 | 1990-12-18 | Extrel Corporation | Method and apparatus for introduction of fluid streams into mass spectrometers and other gas phase detectors |
| CA2317830A1 (en) * | 2000-09-08 | 2002-03-08 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of The Environment | Particle concentrator |
| US20090201504A1 (en) * | 2005-08-09 | 2009-08-13 | Maxwell Sensors, Inc. | Hydrodynamic focusing for analyzing rectangular microbeads |
| US20110277632A1 (en) * | 2007-07-31 | 2011-11-17 | Cfd Research Corporation | Electrostatic Aerosol Concentrator |
| US10532357B1 (en) * | 2019-04-26 | 2020-01-14 | Genus Plc | Single-sheath microfluidic chip |
| CN110639630A (en) * | 2019-09-23 | 2020-01-03 | 四川长虹电器股份有限公司 | Passive microfluidic chip structure for separating particles with different particle sizes |
| CN110935238A (en) * | 2019-12-05 | 2020-03-31 | 西安交通大学 | Micro-nano particle enrichment device based on coupling of variable cross-section microchannel and viscoelastic fluid |
| CN113109107A (en) * | 2021-03-24 | 2021-07-13 | 西安交通大学 | Enrichment device of aerosol particles |
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