CN105771765B - A kind of passive type micro-mixer of built-in periodicity stop block and baffle plate - Google Patents
A kind of passive type micro-mixer of built-in periodicity stop block and baffle plate Download PDFInfo
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- CN105771765B CN105771765B CN201610189874.5A CN201610189874A CN105771765B CN 105771765 B CN105771765 B CN 105771765B CN 201610189874 A CN201610189874 A CN 201610189874A CN 105771765 B CN105771765 B CN 105771765B
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- stop block
- mixed
- central shaft
- main channel
- mixer
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Classifications
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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
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/30—Micromixers
- B01F33/3034—Micromixers using induced convection or movement in the mixture to mix or move the fluids without mechanical means, e.g. thermodynamic instability, strong gradients, etc.
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/23—Mixing of laboratory samples e.g. in preparation of analysing or testing properties of materials
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
The present invention discloses the passive type micro-mixer of built-in the periodicity stop block and baffle plate in a kind of microfluid system, it is bonded together by upper cover plate and with upper cover plate and the mixed plate immediately below upper cover plate forms, mixed plate is provided with a main channel, one outlet passage and three access roades, multiple mixed cells are provided with along the central axis direction of main channel inside main channel, each mixed cell is made up of four cylindrical stop blocks and two triangular baffles；In the front side of central shaft, each triangular baffle, two cylindrical stop blocks interlaced arrangement successively along central axis direction；In the rear side of central shaft, interlaced arrangement, each triangular baffle are respectively positioned on the opposite middle of two cylindrical stop blocks successively for each two cylinder stop block, a triangular baffle along central axis direction；Triangular baffle has the function that afflux and increase fluid radial velocity gradient, and multiple mixed cells can not be influenceed by Reynolds number size, realize and be thoroughly mixed in all reynolds number ranges.
Description
Technical field
The present invention relates to the microfluid system in microcomputer electrical domain, more particularly to the micro-mixer in microfluid system.
Background technology
Microfluid system is realized under minute yardstick to micro by being integrated to microchannel, Micropump, micro-valve, micro-mixer
Control, operation and the detection of fluid, it has turned into an important branch of MEMS.In microfluid system, whole system
The analysis efficiency of system be often depending on two or more fluids can quickly, be sufficiently mixed, therefore Microfluidic Mixing technology is micro-
The emphasis of fluid system.As the important component of microfluid system, micro-mixer is used to realize differential responses thing in micro- chi
Being sufficiently mixed under the conditions of degree, using more and more extensive in microanalytical chemistry, biochip, micro- chemical system.
Micro-mixer can be divided into passive type and active two class according to extra power source is whether there is.Passive type micro-mixer master
To use has complex geometry（Increase baffle plate such as in fluid channel, open up groove）Microchannel form chaos pair
Stream, to improve the convection intensity of fluid, so as to increase the contact area of fluid mixing, improve mixing efficiency；Active microring array
Device is mainly by increasing external disturbance（Such as magnetic/electric field disturbance, thermal agitation, ultrasonic wave disturbance etc.）To promote Microfluidic Mixing.
Comparatively speaking, because passive type micro-mixer does not need plus exterior power source, therefore more stablize and be easily integrated.And
Improve passive type micro-mixer mixing efficiency method on, optimization channel design and strengthen chaotic advection be at present it is putative most
One of best method.
Under minute yardstick, because Reynolds number is very low, it is difficult to form turbulent flow, to realize being thoroughly mixed for microfluid（Mixing effect
Rate is more than 90%）It is highly difficult.Thus existing passive type micro-mixer is only after Reynolds number is more than certain numerical value, ability
Reach the index being thoroughly mixed, this limits the use of designed micro-mixer to a certain extent.
The content of the invention
The invention aims to overcome existing passive type micro-mixer only after Reynolds number is more than certain numerical value
It can be only achieved the deficiency being thoroughly mixed and propose a kind of passive type micro-mixer of built-in periodicity stop block and baffle arrangement, can be with
Being thoroughly mixed for microfluid is realized in all reynolds number ranges studied, it is simple in construction, it is easy to process, being easily integrated and
Miniaturization.
The technical solution adopted by the present invention is：The present invention is bonded together by upper cover plate and with upper cover plate and is located at upper cover plate
The mixed plate composition of underface, mixed plate are provided with a main channel, one outlet passage and three access roades, three entrances
Passage is in the left-half of mixed plate, and exit passageway is on the right half part of mixed plate, three access roades and exit passageway
Between connect main channel, multiple mixed cells are provided with along the direction of the central shaft of main channel inside main channel, each mixing
Unit is made up of four cylindrical stop blocks and two triangular baffles；In the front side of central shaft, along central axis direction each
Triangular baffle, two cylindrical stop blocks interlaced arrangement successively；In the rear side of central shaft, each two cylinder along central axis direction
Interlaced arrangement, each triangular baffle are being respectively positioned on the opposite of two cylindrical stop blocks just successively for form drag block, a triangular baffle
It is middle；The section of cylindrical stop block is circular, and triangular baffle cuts for the outer wall of main channel to what main channel inner recess was formed
Face is the structure of isosceles right triangle, and the base of triangular baffle and the outer wall of main channel coincide, isosceles right triangle
Drift angle be the summit of 90 ° and the drift angle on the central shaft, two summits on isosceles right triangle base and right opposite
Connecting line is perpendicular to the central shaft between the center of circle of cylindrical stop block.
Further, all cylindrical stop blocks equidistant placement along central axis direction, all triangular baffles are in
Equidistant placement on mandrel direction, each cylindrical stop block are respectively positioned on the middle between central shaft and main channel outer wall.
Further, the upper-lower height of cylindrical stop block and triangular baffle is identical with the height of main channel.
The present invention compared with prior art after beneficial effect be：The present invention is to utilize special flow passage structure form, is made
What the principle that fluid produces violent chaotic advection in fluid channel designed；Originally parallel fluid can be made during chaotic advection
Phenomena such as layer occurs stretching, segmentation, distorts, folds, promotes fluid to produce lateral flow and vortex region, can significantly strengthen mixing.
Triangular baffle in the present invention has the function that " afflux " and increase fluid radial velocity gradient, changes fluid local velocity
Increase suddenly, and produce and stream near cylindrical stop block, whirlpool area is formed, so as to effectively improve chaotic advection intensity, increase
Contact area between fluid, reaches and is thoroughly mixed.The passive type micro-mixer for promoting to mix using chaotic advection principle with other
Structure is compared, and structure of the present invention is more simple, is easy to process and is integrated, it is often more important that, the present invention has multiple mixed cells,
It can not be influenceed by Reynolds number size, being thoroughly mixed for microfluid is realized in all reynolds number ranges studied.
Brief description of the drawings
Fig. 1 is the agent structure sectional view of the present invention；
Fig. 2 is the top view of upper cover plate 15 in Fig. 1；
Fig. 3 is the sectional view of A-A directions mixed plate 8 in Fig. 1；
Fig. 4 is the enlarged drawing of single mixed cell on mixed plate 8 in Fig. 3；
Fig. 5 is the mixing efficiency of the present invention and the graph of a relation of Reynolds number when mixed cell number is 5,6,7 respectively；
In figure：1. access road；2. access road；3. main channel；4. cylindrical stop block；5. triangular baffle；6. center
Axle；7. exit passageway；8. mixed plate；9. access road；10. cross passage；11. inlet hole；12. inlet hole；13 outlet openings；
14 inlet holes；15 upper cover plates.
Embodiment
As shown in figure 1, the present invention is made up of upper cover plate 15 and the mixed plate being bonded together with upper cover plate 15 8, mix
Plate 8 is located at the underface of upper cover plate 15, and the thickness of upper cover plate 15 is H1,100 μm≤H1≤200 μm.
Referring back to Fig. 2, three inlet holes and one outlet hole are provided with upper cover plate 15, this four Kong Jun are vertical lead to
Hole, upper-lower height are H1, equal to the thickness of upper cover plate 15.It is the first inlet hole in the left-half of upper cover plate 15 respectively
11st, the second inlet hole 12, triple feed inlet hole 14 and the outlet opening 13 on the right half part of upper cover plate 15.
Referring back to Fig. 1 and Fig. 3, lead on mixed plate 8 provided with a main channel 3, one outlet passage 7 and three entrances
Road, the upper-lower height of these all passages on mixed plate 8 is H2.Three access roades are first entrance passage 1, respectively
Two access roades 2 and the 3rd access road 9.Wherein, three access roades are located in the left-half of mixed plate 8, exit passageway 7
On the right half part of mixed plate 8, main channel 3 is connected between three access roades and exit passageway 7.First entrance passage 1, master
Passage 3, the central shaft 6 of exit passageway 7 are conllinear.The central shaft of the access road 9 of second entrance passage 2 and the 3rd is conllinear, and second
The central shaft of the access road 9 of access road 2 and the 3rd is each perpendicular to first entrance passage 1, main channel 3, the center of exit passageway 7
Axle 6.Three access roades are connected and communicated with main channel 3, and a cross passage 10 is formed on mixed plate 8.Three entrances
The passage length of passage is identical, is L1,200 μm≤L1≤400 μm；The access road 9 of second entrance passage 2 and the 3rd leads to
Road width is equal, and sum of the two is constantly equal to the channel width of first entrance passage 1, the channel width of first entrance passage 1 with
Main channel 3 is identical with the channel width of exit passageway 7, is W, 100 μm≤W≤200 μm.
Three inlet holes on upper cover plate 15 are the first inlet hole 11, the second inlet hole 12, triple feed inlet hole 14 and one
Outlet opening 13 positional punch, position of three inlet holes directly on pyrex7740 glass are corresponded respectively on mixed plate 8
Three access roades are the position of first entrance passage 1, second entrance passage 2, the 3rd access road 9 and one outlet passage 7,
Three inlet holes are connected with corresponding three access roades respectively, such as：First inlet hole 11 is connected with first entrance passage 1
Logical, the second inlet hole 12 is connected with second entrance passage 2, and triple feed inlet hole 14 is connected with the 3rd access road 9.Outlet opening
13 position correspondence is in the position of exit passageway 7, and outlet opening 13 connects with exit passageway 7.The diameter of three inlet holes with
The channel width of corresponding three access roades is identical below, such as：The diameter of first inlet hole 11 enters with first below
The channel width of mouthful passage 1 is identical, the second inlet hole 12, the diameter in triple feed inlet hole 14 it is identical and with second entrance passage 2, the
The channel width of three access roades 9 is identical.
Inside main channel 3 cylindrical stop block 4 and triangular baffle 5 are periodically provided with along the direction of central shaft 6, every four
It is L4 that individual cylindrical stop block 4 and two triangular baffles 5, which form a distance between mixed cell, each mixed cell, should
Distance L4 is equal to the width W, i.e. L4=W of main channel 3.It is disposed with multiple such mixed cells, the present invention altogether in main channel 3
Quantity n >=6 of middle mixed cell.The upper-lower height of cylindrical stop block 4 and triangular baffle 5 is H2,100 μm≤H2≤200 μ
M is identical with the channel height on mixed plate 8.First mixed cell is connected with three access roades, and the of first mixed cell
Axial beeline between one cylindrical access road of stop block 4 and three is L2,300 μm≤L2≤600 μm.Last
Mixed cell is connected with the head end of exit passageway 7, and last cylindrical stop block 4 of last mixed cell is apart from exit passageway
The axial length of 7 ends is L3,200 μm≤L3≤400 μm.
In each mixed cell, equidistant placement, left and right are adjacent in the lateral direction along central shaft 6 for four cylindrical stop blocks 4
The distance between two cylindrical stop blocks 4 are L4.Because the distance between each mixed cell is also L4, so, the present invention
In all cylindrical stop block 4 equidistant placement, all triangular baffles 5 along the direction of central shaft 6 it is first-class along the direction of central shaft 6
Away from arrangement.
Wherein, two cylindrical stop blocks 4 of the left in four cylindrical stop blocks 4 are located on rear side of central shaft 6, and the two of right
Individual cylindrical stop block 4 is located at the front side of central shaft 6, the i.e. cylindrical stop block 4 of the two of left and two cylindrical phases of stop block 4 at rear
Arrangement is staggered front to back for central shaft 6.One is arranged before central shaft 6 in two cylindrical opposite middles of stop block 4 of left
The triangular baffle 5 of side, a triangle in the rear side of central shaft 6 is arranged in two cylindrical opposite middles of stop block 4 of right
Shape baffle plate 5.In this way, in multiple mixed cells, in the front side of central shaft 6, along the direction of central shaft 6, a triangular baffle 5,
Two cylindrical stop blocks 4 interlaced arrangement successively；In the rear side of central shaft 6, along the direction of central shaft 6, two cylindrical stop blocks 4,
Interlaced arrangement, each triangular baffle 5 are respectively positioned on the opposite middle of two cylindrical stop blocks 4 to one triangular baffle 5 successively,
Every four cylindrical stop blocks 4 and two triangular baffles 5 form a mixed cell along the direction of central shaft 6.
Cylindrical stop block 4 is that section is circular structure, triangular baffle 5 for main channel 3 outer wall to inside main channel 3
The section that depression is formed is the structure of isosceles right triangle, and the outer wall on the base and main channel 3 of triangular baffle 5 coincides,
Isosceles right triangle summit is on the central shaft 6 of mixed plate 8, and the apex drift angle is 90 °, isosceles right triangle base
Connecting line is perpendicular to central shaft 6 between the center of circle of the cylindrical stop block 4 of right opposite respectively on two summits, and another two top
The distance between point is L4.The diameter of each cylindrical stop block 4 is d, 0.4W≤d<0.45W, each cylindrical stop block 4
The center of circle is identical with the distance of the outer wall of main channel 3 to central shaft 6, is (W-2d)/4, i.e., each cylindrical stop block 4 is located at central shaft
6 and the middle of the outer wall of main channel 3.
Mixed plate 8 is by dimethyl silicone polymer organosilicon（PDMS）It is process, its concrete technology flow process is：First, exist
The upper thermally grown SiO of PDMS2As mask, mask thicknesses are 2 μm or so；Then in SiO2Smear on mask and protected compared with thick photoresist,
Using photoetching process and etch SiO2Mask, so as in SiO2On etch and the identical micro-mixer planar junction of mask plate
Structure；Then, etched using Alcatel dry etch process front, etching depth H2；Finally, dry method is removed photoresist, oxide layer, clearly
It is aligned after wash clean with upper cover plate 15 and carries out electrostatic bonding.
During present invention work, led to by the second inlet hole 12, triple feed inlet hole 14 to second entrance passage 2, the 3rd entrance
What is injected in road 9 is same liquid, and what is injected by the first inlet hole 11 to first entrance passage 1 is another liquid, two
Kind different liquids are injected with identical speed, to ensure that both different fluid equivalents inject micro-mixer.Two kinds of liquid flow through
During cross passage 10, completion is tentatively mixed to form mixed liquor；Then, mixed liquor enters the cylindrical stop block 4 of periodic arrangement
With the region of triangular baffle 5, because triangular baffle has the function that " afflux " and increase fluid radial velocity gradient, make fluid
Local velocity's change increase, and produce and stream near cylindrical stop block 4 suddenly, forms whirlpool area, so as to effectively improve chaos
Convection intensity, increase the contact area between fluid, reach mixing purpose；Due to triangular baffle 5 and cylindrical stop block 4 vertically
Mixed process is presented in the whole periodically of main channel 3 in periodic arrangement, mixed liquor, is advantageous to induce generation chaotic advection, carries
High mixing efficiency.Finally, the mixed liquor flowed out from main channel 3 flows into exit passageway 7, and flows out micro-mixer from outlet opening 13,
Complete mixed process.
Curve C1, C2, C3 represent the pass of the mixing efficiency and Reynolds number when mixed cell number n is 5,6,7 respectively in Fig. 5
System, as seen from Figure 5, during mixed cell number n differences, mixing efficiency makees the change of same trend with Reynolds number, but micro- mixed
The minimum mixing efficiency of clutch improves constantly with mixed cell number n increase；As mixed cell number n >=6, minimum mixing
Efficiency has been over 90%, as shown in curve C2, C3 in Fig. 5, has reached the state of being thoroughly mixed.
Claims (7)
- A kind of 1. passive type micro-mixer of built-in periodicity stop block and baffle plate, by upper cover plate（15）With with upper cover plate（15）Bonding Together and it is located at upper cover plate（15）The mixed plate of underface（8）Composition, mixed plate（8）It is provided with a main channel（3）, one Exit passageway（7）With three access roades, three access roades are in mixed plate（8）Left-half on, exit passageway（7）Mixed Plywood（8）Right half part on, three access roades and exit passageway（7）Between connect main channel（3）, it is characterized in that：In master Passage（3）It is internal along main channel（3）Central shaft（6）Direction be provided with multiple mixed cells, each mixed cell is by four Cylindrical stop block（4）With two triangular baffles（5）Form；In central shaft（6）Front side, along central shaft（6）It is each on direction Individual triangular baffle（5）, two cylindrical stop blocks（4）Interlaced arrangement successively；In central shaft（6）Rear side, along central shaft（6）Side Upward each two cylinder stop block（4）, a triangular baffle（5）Interlaced arrangement successively, each triangular baffle（5）It is respectively positioned on Two cylindrical stop blocks（4）Opposite middle；Cylindrical stop block（4）Section be circular, triangular baffle（5）For main channel （3）Outer wall to main channel（3）Inner recess formed section be isosceles right triangle structure, triangular baffle（5）'s Base and main channel（3）Outer wall coincide, isosceles right triangle drift angle is the summit of 90 ° and the drift angle in the central shaft （6）On, two summits on isosceles right triangle base and the cylindrical stop block of right opposite（4）Circular cross-section the center of circle between Connecting line is perpendicular to the central shaft（6）.
- 2. a kind of passive type micro-mixer of built-in periodicity stop block and baffle plate according to claim 1, it is characterized in that：It is all Cylindrical stop block（4）Along central shaft（6）Equidistant placement on direction, all triangular baffles（5）Along central shaft（6）On direction Equidistant placement, each cylindrical stop block（4）It is respectively positioned on central shaft（6）And main channel（3）Middle between outer wall.
- 3. a kind of passive type micro-mixer of built-in periodicity stop block and baffle plate according to claim 1, it is characterized in that：Cylinder Form drag block（4）And triangular baffle（5）Upper-lower height and main channel（3）Height it is identical.
- 4. a kind of passive type micro-mixer of built-in periodicity stop block and baffle plate according to claim 1, it is characterized in that：It is adjacent Two cylindrical stop blocks（4）The distance between the center of circle of circular cross-section be equal to main channel（3）Width.
- 5. a kind of passive type micro-mixer of built-in periodicity stop block and baffle plate according to claim 1, it is characterized in that：It is described Quantity n >=6 of mixed cell.
- 6. a kind of passive type micro-mixer of built-in periodicity stop block and baffle plate according to claim 1, it is characterized in that：First Individual mixed cell is connected with three access roades, first cylindrical stop block in first mixed cell（4）With three entrances Beeline is L2 between passage, 300 μm≤L2≤600 μm；Last mixed cell and exit passageway（7）Head end phase Even, last cylindrical stop block in last mixed cell（4）Apart from exit passageway（7）The axial length of end is L3,200 μm≤L3≤400 μm.
- 7. a kind of passive type micro-mixer of built-in periodicity stop block and baffle plate according to claim 1, it is characterized in that：Each Cylindrical stop block（4）Diameter be d, 0.4W≤d<0.45W, W are main channels（3）Width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610189874.5A CN105771765B (en) | 2016-03-30 | 2016-03-30 | A kind of passive type micro-mixer of built-in periodicity stop block and baffle plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610189874.5A CN105771765B (en) | 2016-03-30 | 2016-03-30 | A kind of passive type micro-mixer of built-in periodicity stop block and baffle plate |
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| Publication Number | Publication Date |
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| CN105771765A CN105771765A (en) | 2016-07-20 |
| CN105771765B true CN105771765B (en) | 2018-02-27 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109134162A (en) * | 2017-06-27 | 2019-01-04 | 南京理工大学 | A kind of priming crystal system based on block stream |
| CN107583551A (en) * | 2017-10-29 | 2018-01-16 | 北京工业大学 | A kind of plane passive type micro-mixer of stepped passageway processing font baffle plate |
| CN109173766B (en) * | 2018-09-25 | 2021-06-04 | 北京工业大学 | High-performance micro mixer for ultra-high performance liquid chromatography analyzer |
| CN109529692B (en) * | 2018-12-26 | 2021-04-20 | 大连理工大学 | Passive convergent-divergent micromixer for low diffusion coefficient fluid |
| CN113976013B (en) * | 2021-11-01 | 2022-08-05 | 西安交通大学 | Microstructure enhanced micro mixer and three-dimensional forming preparation and application thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19746583A1 (en) * | 1997-10-22 | 1999-04-29 | Merck Patent Gmbh | Micro-mixer for liquid, viscous or gaseous phases |
| CN2650109Y (en) * | 2003-11-06 | 2004-10-20 | 浙江大学 | Three-dimensional cross-guiding miniature mixer |
| TWI286084B (en) * | 2006-03-10 | 2007-09-01 | Horn-Jiun Sheen | Micro mixer |
| CN103877905B (en) * | 2013-11-11 | 2016-01-20 | 江苏大学 | A kind of passive type micro-mixer |
| KR20150105856A (en) * | 2014-03-10 | 2015-09-18 | 연세대학교 산학협력단 | Micro Mixer Using Taylor Gortler Vortex and Manufacturing Method Thereof |
| CN105195053B (en) * | 2015-09-22 | 2018-06-19 | 北京工业大学 | A kind of concussion jetting type micro-mixer based on microbubble driving |
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