CN109985543B - Spindle-shaped passive micro mixer - Google Patents

Spindle-shaped passive micro mixer Download PDF

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Publication number
CN109985543B
CN109985543B CN201910311895.3A CN201910311895A CN109985543B CN 109985543 B CN109985543 B CN 109985543B CN 201910311895 A CN201910311895 A CN 201910311895A CN 109985543 B CN109985543 B CN 109985543B
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China
Prior art keywords
channel
spindle
shaped
communicated
mixing unit
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Expired - Fee Related
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CN201910311895.3A
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CN109985543A (en
Inventor
牛文杰
肖华芝
英豪
赵淇东
杨珊珊
孙久洋
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China University of Petroleum East China
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China University of Petroleum East China
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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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/41—Mixers of the fractal type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4321—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa the subflows consisting of at least two flat layers which are recombined, e.g. using means having restriction or expansion zones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4323—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa using elements provided with a plurality of channels or using a plurality of tubes which can either be placed between common spaces or collectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B01F25/4335—Mixers with a converging-diverging cross-section
    • 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
    • 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)
  • Dispersion Chemistry (AREA)

Abstract

The invention discloses a spindle-shaped passive micro mixer, which comprises a cover plate, a base body and a bottom plate which are sequentially arranged from top to bottom, wherein the cover plate is provided with a first inlet channel, a second inlet channel and a spindle-shaped mixing unit; the mixed gas flows in the first channel and depends on molecular diffusion, and then is divided into multiple paths under the shunting action of the side channels and the middle channel to be respectively mixed; and the mixed liquid is converged at the converging part, flows to the spindle-shaped mixing unit on the bottom plate through the third channel, and is mixed again, so that the mixing effect is improved.

Description

Spindle-shaped passive micro mixer
Technical Field
The invention belongs to the field of micro mixers, and particularly relates to a spindle-shaped passive micro mixer.
Background
As an important component in the microfluidic chip, the micromixer plays an important role in the microfluidic analysis process. At the microscopic scale, due to the sharp increase of the surface area to volume ratio of the microchannel, the flow velocity of the fluid in the microchannel is generally small, belonging to the laminar flow at low reynolds number. Therefore, the micro-fluid mixing can be realized only under the diffusion action between molecules at the micro-scale, and the design of the micro-mixer is very important.
Micromixers can be classified into active micromixers and passive micromixers according to whether mixing is performed by means of external power. The active micro mixer is mainly provided with an energy field driving device to disturb a fluid flow field in a micro channel to promote relative flow, enhance the diffusion effect and the convection effect among fluid molecules and finally improve the mixing strength, but the active micro mixer is not applied on a large scale because of the defects of difficult integration, easy heating and the like. The passive micro mixer needs no external power, and the application principle is that the micro channel with special structure is designed in the micro channel to change the flow field in the channel, and the common passive micro mixer at present enhances the chaotic convection among mixed fluids by mainly changing the geometric shape of the micro mixer, increases the effective contact area among the fluids, shortens the distance of molecular diffusion, and improves the mixing intensity and the mixing performance of the microfluid. The passive micro mixer is widely applied by the advantages of simple structure, stable operation, easy integration, no need of any power source input and the like.
The inventor finds that the passive micro mixer with a general two-dimensional structure is simple to process by prolonging the length of the whole mixer or increasing the number of the blocking blocks in the channel, but the mixing efficiency is low and the mixing channel is long; the passive micromixers with complex structures, such as a shunt recombination type passive micromixer, a chaotic convection type passive micromixer and the like, have violent disturbance on fluid and good mixing effect, but have the defects of complicated processing and manufacturing process, large microchannel pressure drop and the like.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a spindle-shaped passive micro mixer, in which two spindle-shaped mixing units are oppositely disposed, on one hand, a flow dividing channel is disposed in each spindle-shaped mixing unit to divide a fluid, and a contraction portion is disposed on the flow dividing channel, and a vortex and an expansion vortex are respectively formed at an inlet and an outlet of the contraction portion, so as to intensify disturbance of the fluid and improve fluid mixing efficiency; on the other hand, the flow direction of the fluid is changed sharply by combining the stepped channel arranged in the vertical direction, the disturbance of the fluid on different dimensions is increased, and the fluid is fully mixed.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fusiform passive mixer comprises a cover plate, a base body and a bottom plate which are sequentially arranged from top to bottom, wherein the cover plate is provided with a first inlet channel, a second inlet channel, a first channel and a fusiform mixing unit, the first inlet channel and the second inlet channel are both communicated with the first channel, the first channel is communicated with the fusiform mixing unit, the bottom plate is also provided with the fusiform mixing unit and the first channel which are mutually communicated, the base body is provided with a third channel, one end of the third channel is communicated with the fusiform mixing unit on the cover plate, and the other end of the third channel is communicated with the fusiform mixing unit on the bottom plate.
Still further, the spindle-shaped mixing unit includes: a second passage and a confluence portion communicating with each other; the second passageway includes side passageway and first intermediate passage, the side passageway has two, is spindle-shaped setting, and the nodical one end of the first passageway of the nodical intercommunication of the minor face of two side passageways, the nodical intercommunication confluence portion on the long limit of two side passageways, the nodical and the nodical on long limit of first intermediate passage intercommunication minor face, first passageway, first intermediate passage and confluence portion axis altogether.
Furthermore, the second channel also comprises a second middle channel arranged on each side channel, one end of each second middle channel is communicated with the short side of each side channel, and the other end of each second middle channel is communicated with the long side of each side channel; the second middle channel has a plurality ofly, all is parallel to first middle channel setting.
Furthermore, a first contraction part is arranged on the first middle channel, and the sectional area of the first contraction part is smaller than that of the other parts of the first middle channel; and a second contraction part is arranged on the second middle channel, and the sectional area of the second contraction part is smaller than that of the other part of the second middle channel.
Furthermore, the long sides and the short sides of the side channels are connected by circular arc channels.
Further, the length of the long side of the side channel is twice the length of the short side.
Preferably, the widths of the first inlet channel, the second inlet channel, the first channel, the side channels, the first middle channel main body part and the second middle channel main body part are all equal, the width of the first contraction part is half of the width of the first middle channel main body part, the width of the second contraction part is half of the width of the second middle channel main body part, and the included angle of the two short sides of the two side channels is greater than that of the two long sides.
Furthermore, the confluent part of the spindle-shaped mixing unit on the cover plate is communicated with the confluent part of the spindle-shaped mixing unit on the bottom plate through a third channel and is arranged oppositely.
Furthermore, the third channel is a stepped channel.
Furthermore, two fluids to be mixed respectively flow through the first inlet channel and the second inlet channel on the cover plate, one end of the first channel on the cover plate is converged, then sequentially flow through the spindle-shaped mixing unit on the cover plate, the third channel on the base body and the spindle-shaped mixing unit on the bottom plate, and finally the mixed fluid flows out from the first channel, namely the outlet channel, on the bottom plate.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) the liquid flows in the first channel by means of molecular diffusion, after mixing, the liquid is divided into multiple paths under the shunting action of the side channels and the middle channel, and then the multiple paths are combined into a stream of liquid;
(2) the fluid in the first middle channel and the second middle channel is extruded to form jet flow under the action of the contraction part, so that the flow speed of the fluid is improved;
(3) the fluid speed at the contraction part is increased, disturbance vortex is formed at the inlet of the contraction part by the fluid, and an expansion vortex system is formed at the outlet of the contraction part, so that the disturbance effect of the fluid is improved, and the sufficient mixing is realized;
(4) the short sides and the long sides of the side channels are connected through the arc-shaped channels, and fluid can generate secondary flow collision in the micro-channels due to the action of centrifugal force in the arc-shaped channels, so that the disturbance of the fluid is intensified, and the mixing degree is improved;
(5) after the flow splitting effect of the second channel, the side channels and the middle channel of the second channel are converged at the converging part, and disturbance is generated due to the change of the flow line, so that the contact area between different paths of fluid is increased, and the mixing effect of the fluid is improved;
(6) the flow direction of the fluid is changed for many times by utilizing the stepped channel, so that the disturbance of the fluid is further increased, and the mixing effect is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a cross-sectional view of the present invention taken along the dotted line A-A in FIG. 2;
FIG. 2 is a schematic diagram of the main structure of the spindle-shaped passive mixer of the present invention;
FIG. 3 is a schematic structural diagram of a spindle-shaped mixing unit in the spindle-shaped passive mixer according to the present invention;
1. cover plate, 2, bottom plate, 3, base body, 4, first inlet channel, 5, second inlet channel, 6, straight channel, 7, fusiform mixing unit, 8, ladder channel, 9, outlet channel, 701, short side channel, 702, middle channel, 703, long side channel, 704, constriction, 705, junction.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described in the background art, in order to achieve a better mixing effect, extend the length of the whole mixer or increase the number of the blocking blocks in the channel, which results in a large flow loss and a long mixing time, and is difficult to satisfy the existing micro-mixing requirements, the present application provides a spindle-shaped passive micro-mixer in order to solve the above technical problems.
Example 1
In a typical embodiment of the present application, as shown in fig. 1, a spindle-shaped passive micro mixer is provided, which comprises a cover plate 1, a base 3 and a bottom plate 2 arranged in sequence from top to bottom, wherein a spindle-shaped mixing unit 7 is respectively arranged on the cover plate and the bottom plate, the cover plate 1 is provided with a first inlet channel 4, a second inlet channel 5, a first channel and a spindle-shaped mixing unit 7, the first channel is a straight channel 6, the first inlet channel and the second inlet channel are communicated with the spindle-shaped mixing unit on the cover plate through the straight channel 6 after being converged, the bottom plate is also provided with a spindle-shaped mixing unit 7 having the same structure as the spindle-shaped mixing unit on the cover plate, the bottom plate is further provided with a first channel, the first channel is an outlet channel 9, the base is provided with a third channel, the third channel is a step channel 8, one end of the step channel 8 is communicated with the spindle-shaped mixing unit on the cover plate, the other end is communicated with the spindle-shaped mixing unit on the bottom plate, and finally the mixed fluid flows out through an outlet channel 9 on the bottom plate 2.
After being injected, the two fluids collide at the intersection of the two fluids and are diffused at one end of the first channel, so that the primary mixing effect is improved under the action of collision.
As a further preferred option, the merging portion of the first spindle-shaped passive hybrid structure and the merging portion of the second spindle-shaped passive hybrid structure are communicated through a stepped channel and arranged in opposite directions;
further preferably, the base body is formed by sequentially overlapping a plurality of layers, and the inner parts of the base body form a stepped channel together.
The operation of the micromixer is described below with reference to fig. 1:
two kinds of fluid to be mixed respectively flow through a first inlet channel 4 and a second inlet channel 5 on the cover plate, one end of a first channel on the cover plate, namely a straight channel 6 is converged, then the two kinds of fluid sequentially flow through a second channel of a spindle-shaped mixing unit 7 on the cover plate, a converging part 705 of the spindle-shaped mixing unit on the base plate, a stepped channel 8 on the base body, a converging part 705 of the spindle-shaped mixing unit on the base plate and a second channel of the spindle-shaped mixing unit on the base plate, and finally the mixed fluid flows out from a first channel on the base plate, namely an outlet channel 9.
Example 2
In the second embodiment of the present application, as shown in fig. 2 and 3, different from example 1, is a spindle-shaped mixing unit including a second passage and a confluence part 705 which are sequentially communicated; the second channel comprises two side channels and a first middle channel, the two side channels are arranged in a spindle shape, the intersection point of the short side channels 701 of the two side channels is communicated with one end of the first channel, the intersection point of the long side channels 703 of the two side channels is communicated with the junction part 705, the middle channel 702 is communicated with the intersection point of the short sides and the intersection point of the long sides, and the first channel, the first middle channel and the junction part 705 share a central axis;
the second channel also comprises a second middle channel 702 arranged on each side channel, one end of each second middle channel is communicated with the short side of each side channel, and the other end of each second middle channel is communicated with the long side of each side channel; a plurality of second intermediate channels are arranged in parallel to the first intermediate channels;
it can be understood that the two side channels are symmetrically arranged in a spindle shape through the arrangement of the spindle shape, so that the flowing length of the fluid in the side channels is improved under the condition of not increasing the axial length, and the mixed fluid is divided at one end of the first channel and is respectively mixed;
the second middle channel is connected with the long sides and the short sides of the side channels, the second middle channel arranged on each side channel is arranged as required, preferably one, one end of the second middle channel is communicated with the middle point of the short side, and the other end of the second middle channel is communicated with the middle point of the long side, so that five shunting channels including three middle channels 702 and two side channels are formed, and shunting and mixing of mixed fluid flowing through the first channel are realized; after the flow splitting effect of the second channel, the side channel and the middle channel of the second channel are merged at the merging part 705, and disturbance is generated due to the change of the flow line, so that the contact area between different paths of fluid is increased, and the mixing effect of the fluid is improved.
Furthermore, a first contraction part is arranged on the first middle channel, and the sectional area of the first contraction part is smaller than that of the other parts of the first middle channel; a second contraction part is arranged on the second middle channel, and the sectional area of the second contraction part is smaller than that of the other part of the second middle channel;
it should be noted that, on the one hand, the fluid in the first intermediate channel and the second intermediate channel is squeezed by the constriction 704, the flow speed of the fluid is increased, and a jet is formed, so that the speed of molecular diffusion is increased; on the other hand, the fluid speed at the contraction part is increased, disturbance vortex is formed at the inlet of the contraction part by the fluid, and expansion vortex system is formed at the outlet of the contraction part, so that the disturbance effect of the fluid is improved, and the sufficient mixing is realized.
Furthermore, the long-side channel 703 and the short-side channel 701 of the side channel are connected by a circular arc channel; the short sides and the long sides of the side channels are connected through the arc-shaped channels, secondary flow is formed in the arc channels, collision of fluid is aggravated, and mixing degree is improved.
Preferably, the widths of the first inlet channel, the second inlet channel, the first channel, the side channels, the first middle channel main body part, the second middle channel main body part and the third channel are all D, the width of the first constriction part is 0.5D, the width of the second constriction part is 0.5D, and the value range of D is more than or equal to 100 μm and less than or equal to 300 μm;
the included angle of two short side channels of the two side channels is α, the included angle of two long side channels is 0.5 α -0.8 α, wherein the value range of α is more than or equal to 60 degrees and less than or equal to α degrees and less than or equal to 120 degrees;
the length of the short-side channel 701 is L, the length of the long-side channel 703 is 2L, and the value range of L is more than or equal to 1000 μm and less than or equal to 1800 μm.
The mixing process of the fluid in the spindle-shaped mixing unit is further detailed below with reference to fig. 3:
after passing through the tail end of the first channel, the fluid flows to the side channel and the first middle channel respectively;
in the first middle channel, when the mixed fluid flows through the first contraction part, the fluid is extruded, the flow velocity of the fluid is increased, and jet flow is formed, so that disturbance vortex is formed at the inlet of the first contraction part, and expansion vortex is formed at the outlet of the first contraction part, so that the mixing degree is improved; in the side channel, the mixed fluid flowing into the short side is divided again by the second middle channel, when the mixed fluid flows through the circular arc channel, a secondary flow is formed due to the action of centrifugal force, in the second middle channel, when the mixed fluid flows through the second contraction part, the fluid is extruded, the flow velocity of the fluid is increased, a jet flow is formed, so that disturbance vortex is formed at the inlet of the second contraction part, an expansion vortex system is formed at the outlet, the mixing degree is improved, and the fluid mixed by the second middle channel reaches the long side again to be merged;
the mixed fluid of the side passage and the middle passage 702 is merged at the merging portion 705, flows through the merging portion, and is discharged to the next passage.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (9)

1. A spindle-shaped passive micromixer is characterized in that,
the improved structure comprises a cover plate, a base body and a bottom plate which are sequentially arranged from top to bottom, wherein the cover plate is provided with a first inlet channel, a second inlet channel, a first channel and a spindle-shaped mixing unit, the first inlet channel and the second inlet channel are both communicated with the first channel, the first channel is communicated with the spindle-shaped mixing unit, the bottom plate is also provided with the spindle-shaped mixing unit and the first channel which are mutually communicated, the base body is provided with a third channel, one end of the third channel is communicated with the spindle-shaped mixing unit on the cover plate, and the other end of the third channel is communicated with the spindle-shaped mixing unit on the bottom plate;
the spindle-shaped mixing unit includes: a second passage and a confluence portion communicating with each other; the second channel comprises two side channels and a first middle channel, the two side channels are arranged in a spindle shape, the intersection point of the short sides of the two side channels is communicated with one end of the first channel, the intersection point of the long sides of the two side channels is communicated with the junction, the first middle channel is communicated with the intersection point of the short sides and the intersection point of the long sides, and the first channel, the first middle channel and the junction share the central axis;
the first middle channel is provided with a first contraction part, the sectional area of the first contraction part is smaller than that of the other parts of the first middle channel, and the first contraction part is used for forming disturbance vortex at an inlet of the first contraction part and forming expansion vortex system at an outlet of the first contraction part.
2. The fusiform passive micromixer of claim 1, wherein said second channels further comprise a second intermediate channel provided on each of the side channels, one end of the second intermediate channel being in communication with the short side of the side channel, the other end of the second intermediate channel being in communication with the long side of the side channel; the second middle channel has a plurality ofly, all is parallel to first middle channel setting.
3. The spindle-shaped passive micromixer according to claim 2, wherein said second intermediate channel is provided with a second constriction having a cross-sectional area smaller than the cross-sectional area of the other part of the second intermediate channel.
4. Spindle-shaped passive micromixer according to claim 1 or 2, characterized in that the long and short sides of the side channels are connected by circular arc channels.
5. The fusiform passive micromixer according to claim 4, wherein the length of the long side of said side channels is twice the length of the short side.
6. The spindle-shaped passive micromixer according to claim 3, wherein the cross-sectional area of the first constriction is half the cross-sectional area of the first intermediate channel and the cross-sectional area of the second constriction is half the cross-sectional area of the second intermediate channel.
7. The fusiform passive micromixer according to claim 1, wherein the confluence of the fusiform mixing units on the cover plate and the confluence of the fusiform mixing units on the base plate are communicated through a third channel and are disposed in opposition.
8. The spindle-shaped passive micromixer according to claim 1 or 7, wherein said third channel is a stepped channel.
9. The spindle-shaped passive micromixer according to claim 8, wherein the two fluids to be mixed flow through the first inlet channel and the second inlet channel on the cover plate, respectively, join at one end of the first channel on the cover plate, then flow through the spindle-shaped mixing unit on the cover plate, the third channel on the base body and the spindle-shaped mixing unit on the base plate in this order, and finally the mixed fluids flow out from the first channel on the base plate.
CN201910311895.3A 2019-04-18 2019-04-18 Spindle-shaped passive micro mixer Expired - Fee Related CN109985543B (en)

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CN110732355B (en) * 2019-09-27 2021-09-28 东南大学 Micro-mixing micro-fluidic chip
CN112295616B (en) * 2020-09-11 2022-03-18 东南大学 Micro-droplet mixing reinforced micro-fluidic device
CN112495300B (en) * 2020-11-10 2022-02-01 清华大学 Micro-nozzle array film and micro-droplet generating device

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