CN208229810U - A kind of active mode mixer for microflow based on alternating current - Google Patents
A kind of active mode mixer for microflow based on alternating current Download PDFInfo
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- CN208229810U CN208229810U CN201820015691.6U CN201820015691U CN208229810U CN 208229810 U CN208229810 U CN 208229810U CN 201820015691 U CN201820015691 U CN 201820015691U CN 208229810 U CN208229810 U CN 208229810U
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Abstract
The utility model belongs to micro-fluidic chip field, specifically discloses a kind of active mode mixer for microflow based on alternating current, including 2 entrances, 1 outlet, 2 microchannels, 1 block, 8 electrodes.By the way that electrode is arranged in microchannel different location, applies different alternating voltages, generate space non-uniform electric field, break the laminar condition of microfluidic flow by electric field force, reinforce the convection action of two kinds of microfluids, realize the mixing of two kinds of microfluids.The income of the utility model is: electrode structural designs are simple；The use of block is reduced to reduce the inhibition to microfluidic flow；The multiple microring array units of array are not needed, the pressure loss during microfluidic flow is reduced；Entire microfluid mixer is compact-sized, and high efficiency, the high quality mixing of microfluid are realized with shorter microchannel.
Description
Technical field
The utility model relates to a kind of active mode mixer for microflow based on alternating current, hybrid mode is active.
Background technique
Micro-fluidic chip is referred to as chip lab again, be integrated on several square centimeters of chip in relation to chemistry and
The structural units such as sample preparation involved by the research fields such as biology, reaction, separation, detection and cell culture, cracking, and
Network is formed by microchannel, whole system is run through with fluid, to replace conventional chemistry or the various functions of biology laboratory
Analysis platform, with small in size, sample, reagent consumption are few, convenient for it is integrated the advantages that.With the development of technology, miniflow
The field that control chip has been directed at present includes the fields such as biomedicine, environmental monitoring, food safety, judicial expertise.
Mixing under macro-scale typically refers to use mechanical or hydrokinetic method, divides two or more materials mutually
Dissipate and reach the unit operation of certain uniformity coefficient；The mixing of micron dimension scale is mixed with very big difference with macrofluid, this is
Since the convection action of fluid under micron dimension scale is unobvious, in this case, the mixing of microfluid relies primarily on molecule
Between diffusion, so under certain requirement of experiment, the mixing of microfluid becomes more difficult.
Microfluid mixer can be divided into two class of passive microfluid mixer and active mode mixer for microflow, passively decline
Flow mixer generates mixed effect using geometry or fluid behaviour, except power (such as pressure, the electric osmose drive of driving fluid flowing
Move) outside, it mixes without the help of other external force；Active mode mixer for microflow is realized by external force such as magnetic force, electric field force, sound fields
Mixing；The mixed effect of active mode mixer for microflow is preferable, but often structure is complicated, higher cost.
Based on this, the utility model provides that a kind of microchannel structure is single, and electrode design is simple, and mixed effect is apparent
Active mode mixer for microflow realizes two kinds of various concentration Microfluidic Mixings by electric field power drive.
Summary of the invention
The utility model aim is to provide a kind of new structural active mode mixer for microflow based on alternating current, use
In the microfluid high quality for realizing two kinds of various concentrations, efficient uniform mixing；It is further simplified microchannel structure, is shortened micro-
Passage length reduces the stop block structure setting for hindering microfluidic flow, reduces the resistance of microfluidic flow, reduces microfluid along journey
The pressure loss.
The technical solution of the utility model is: a kind of active mode mixer for microflow based on alternating current, including 2 structures
Identical microfluidic inlet, 1 microfluidic outlet port, 2 microchannels (including a straight microchannel and a curved microchannel),
1 block and two arrays of electrodes (including 4 electrodes of 4 electrodes of straight microchannel and curved microchannel).It is described to be based on alternating current
Active mode mixer for microflow be characterized by microchannel different location be arranged electrode, apply different alternating voltages,
The space non-uniform electric field in microchannel is generated, electric field generates driving force in microfluid therein, different in microchannel
Position generates the Secondary Flow of microfluid, breaks the laminar condition of microfluidic flow, reinforces the convection action of two kinds of microfluids, realizes
The mixing of two kinds of microfluid high efficiency, high quality.
The income of the utility model is: the first microfluid is injected from first entrance (1), and second of microfluid is from second
Entrance (2) injection, two kinds of microfluids are followed by straight microchannel and curved microchannel, and microfluid is from Microfluidic Mixing after mixing
Device outlet outflow.Compared to other active mode mixer for microflow, microfluidic channel design more optimizes, and is conducive to reduce microfluid
Energy loss in flow process；Whole device overall structure is simple, easy to process, and cost is relatively low.Compared to other passive type miniflows
Body mixer, microchannel length is shorter, effectively reduces the pressure loss of the microfluid in microchannel flow process；Only
There is a stop block structure, and be free of any moving parts, simplifies the structure design of entire microfluid mixer.
Detailed description of the invention
Fig. 1 is the active mode mixer for microflow two-dimensional structure schematic diagram based on alternating current, in figure: 1. first entrances, 2.
First electrode, 3. straight microchannels, 4. second electrodes, 5. third electrodes, 6. curved microchannels, 7. the 4th electrodes, 8. outlets, 9.
Second entrance, 10. the 5th electrodes, 11. the 6th electrodes, 12. the 7th electrodes, 13. blocks, 14. the 8th electrodes.
Fig. 2 is that the active mode mixer for microflow two-dimensional geometry based on alternating current constitutes schematic diagram, left round upper semi-circle and the right side
Circle lower half circle constitutes the outer tube wall (bold portion) of curved microchannel.
Fig. 3 is the active mode mixer for microflow two dimensional electric field figure based on alternating current, and white represents 0.3V, black representative-
0.3V, it is bigger that color more shallowly represents potential, can be seen that microchannel electric field strength size everywhere in figure.
Fig. 4 is the active mode mixer for microflow inside stream line chart based on alternating current, can be reinforced at each whirlpool
The convection action of two kinds of microfluids realizes mixing.
Specific embodiment
With reference to the accompanying drawing, it elaborates to the utility model, but specific embodiment of the present utility model is not limited to
This.
A kind of active mode mixer for microflow based on alternating current, including first entrance, second entrance, outlet, miniflow are logical
Road (include straight microchannel, curved microchannel), and first group of electrode (it include first electrode, second electrode, third electrode, the 4th
Electrode), second group of electrode (including the 5th electrode, the 6th electrode, the 7th electrode, the 8th electrode) and block.
Specifically, the first microfluid is injected from first entrance, initial flow rate is 100 μm/s, and second of microfluid is from the
The injection of two entrances, initial flow rate are 100 μm/s；Two kinds of miniflow volume densitys are 1000kg/m3, dynamic viscosity is 0.001Pa ﹒
S, conductivity are 118mS/m, relative dielectric constant 80.2.
Specifically, two wall surfaces are arranged above and below straight microchannel in first group of electrode, wherein first electrode and the 6th electrode are applied
Add identical voltage, voltage value is-V0=- sin (ω ﹒ t), second electrode and the 5th electrode apply identical voltage, voltage value be V0=
Sin (ω ﹒ t), wherein angular frequency value is the π of ω=16 rad/s.
Specifically, second group of electrode setting is in curved microchannel outside wall surface, wherein third electrode and the 8th electrode apply phase
Same alternating voltage, voltage value are-V0=- sin (ω ﹒ t), the 4th electrode and the 7th electrode apply identical alternating voltage, and voltage value is
V0=sin (ω ﹒ t), wherein angular frequency value is the π of ω=16 rad/s.
Specifically, being set as 1mol/m from the first microfluid concentration value that first entrance is injected3, injected from second entrance
Second of microfluid concentration value be set as 2 mol/m3, managed from miniflow bulk concentration after the mixing of microfluid mixer outlet outflow
It should be 1.5 mol/m by value3。
Specifically, microchannel wall surface is all set to electrical isolation wall surface, wall surface in addition to line segment (arc segment) where electrode
Electric osmose velocity amplitude is uniquely determined by applied electric field.
Claims (5)
1. a kind of active mode mixer for microflow based on alternating current, including first entrance (1), first electrode (2), straight miniflow are logical
Road (3), second electrode (4), third electrode (5), curved microchannel (6), the 4th electrode (7) export (8), second entrance (9),
5th electrode (10), the 6th electrode (11), the 7th electrode (12), block (13), the 8th electrode (14)；The microfluid mixer
Be characterized in that: the first microfluid is injected from first entrance (1), and second of microfluid is injected from second entrance (9), two kinds of miniflows
Body is followed by straight microchannel (3) and curved microchannel (6), and the electric field force generated during this period by 8 electrodes acts on, sufficiently
(8) outflow is exported after mixing.
2. the active mode mixer for microflow according to claim 1 based on alternating current, the geometry of straight microchannel (3)
Structure is rectangle, and lower side length extended line crosses block (13) center of circle, rectangular aspect ratio 2:1, rectangle width and first entrance (1)
Width ratio be 1:1；Electrode is set at the both ends of two long side, applies alternating voltage, wherein first electrode (2) and the 6th electricity
Pole (11) applies identical voltage, second electrode (4) voltage identical with the 5th electrode (10) application.
3. the active mode mixer for microflow according to claim 1 based on alternating current, the structure of curved microchannel (6)
For reducing elbow；Bend pipe outer diameter is made of the semicircle of about two decentraction same radius, and distance of center circle is in vertical direction component
It is zero, component values are the 1/5 of radius of circle in the horizontal direction；Bend pipe internal diameter is formed by the outer diameter of block (13)；Curved microchannel
Upper four electrodes are circular arc electrode, and camber line is overlapped with bend pipe outer diameter semicircle, and central angle is 20 degree, middle line with it is sharp folded by horizontal line
Angle is 45 degree；Wherein third electrode (5) alternating voltage identical with the 8th electrode (14) application, the 4th electrode (7) and the 7th electrode
(12) apply identical alternating voltage.
4. the active mode mixer for microflow according to claim 1 based on alternating current, first entrance (1) enters with second
The geometry of mouth (9) is rectangle, and bilateral symmetry line is overlapped, and two entrances width ratio is 1:1.
5. the active mode mixer for microflow according to claim 1 based on alternating current, outlet (8) geometry is square
Shape, side length extended line crosses block (13) center of circle, rectangular aspect ratio 2:1, the width ratio of rectangle width and first entrance (1) thereon
For 1:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820015691.6U CN208229810U (en) | 2018-01-05 | 2018-01-05 | A kind of active mode mixer for microflow based on alternating current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820015691.6U CN208229810U (en) | 2018-01-05 | 2018-01-05 | A kind of active mode mixer for microflow based on alternating current |
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| Publication Number | Publication Date |
|---|---|
| CN208229810U true CN208229810U (en) | 2018-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820015691.6U Expired - Fee Related CN208229810U (en) | 2018-01-05 | 2018-01-05 | A kind of active mode mixer for microflow based on alternating current |
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2018
- 2018-01-05 CN CN201820015691.6U patent/CN208229810U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181214 Termination date: 20200105 |
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| CF01 | Termination of patent right due to non-payment of annual fee |