CN116173800A - Passive continuous oscillation jet micromixer - Google Patents

Abstract

The invention discloses a passive continuous oscillation jet micromixer, which is formed by sequentially combining a plurality of flat plate type mixing units and an upper cover plate. The fluid flows in from the feed inlet of the first mixing unit, flows out from the discharge outlet of the upper cover plate after passing through the plurality of mixing units, and completes the mixing process. Each mixing unit has the same symmetrical structure, fluid forms jet flow through 4 shrinkage feed channels distributed in a cross mode, the jet flow oscillates after collision of the centers of the units due to instability of the jet flow, and vortex which turns alternately is formed to enter the elliptical mixing cavity, so that the contact area and convection intensity between the fluids are remarkably increased. And between the adjacent mixing units, the discharge port of the last mixing unit is connected with the feed channel of the next mixing unit, and the connection superposition of a plurality of mixing units repeatedly induces the jet oscillation process, so that the continuous oscillation mixing of the fluid is realized. The invention can induce the passive continuous oscillation of the fluid without external energy input, has low pressure drop and less dead zone, and can realize the efficient mixing of microfluid.

Description

Passive continuous oscillation jet micromixer

Technical Field

The invention relates to the field of microfluidic mixing in microfluidic chips and biochemical equipment, in particular to a passive fluid continuous oscillation micromixer based on impinging jet instability.

Background

Micromixers are important components of biological microfluidic devices and chemical microreactor systems. Under the micro-scale, because the fluid flows in a laminar flow under the condition of low Reynolds number due to the limitation of the channel size, the mixing among the fluids is mainly based on molecular diffusion, so that an additional micro-mixer is needed to improve the convective chaotic intensity of the fluid and enhance the mixing efficiency of the system.

Common micromixers can be divided into two main categories, active micromixers and passive micromixers. The active micromixer is to add external driving devices (such as ultrasound, microwaves, magnetic force and the like) to disturb the fluid in the micro-channel, and the external excitation applied by the active micromixer is generally time-varying, so that the instantaneous movement or oscillation of the fluid in the micro-channel is induced, thereby improving the mixing effect obviously and reducing the range of flow dead areas and the blocking probability. For example, a mixer disclosed in chinese patent document CN103638837a combines a piezoelectric vibrator with a fluid channel to actively promote fluid mixing. However, the active micromixer has high cost, complex integration with the original equipment, and low external field energy conversion rate, and is difficult to apply on a large scale.

The passive micro-mixer does not need to add extra equipment, but changes the fluid movement mode in the channel by designing a special micro-channel structure, increases the effective contact area between the fluids, shortens the distance of molecular diffusion, and improves the mixing performance. Compared with an active mixer, the passive micro-mixer is simple to realize and easy to integrate, and has the advantages of no need of additional energy input and the like, so that the passive micro-mixer is widely applied. However, the current passive micro-mixing design mostly adopts a form of changing the shape curvature of a channel (such as a mixer disclosed in chinese patent document CN103638853 a) or arranging a block inside the channel (such as a mixer disclosed in chinese patent document CN 105771765A), the flow field tends to be steady under the condition of low reynolds number, a complex channel structure needs to be repeatedly arranged to improve the mixing strength, and a dead zone is easily formed by local steady vortex, so that fluid frequently collides with the block and the curved surface rubs to cause a larger pressure drop.

Therefore, if the characteristics of the time-varying flow field of the active micro-mixer can be introduced into the passive micro-mixer, the fluid passive oscillation is induced through the special channel structure, the performance of the mixer is greatly improved, the application range of the passive micro-mixer is widened, and the actual work and production efficiency are improved.

Disclosure of Invention

In order to solve the technical problems, the invention provides a passive continuous oscillation micromixer based on impinging jet instability, which has the advantages of simple structure, convenient processing, capability of inducing spontaneous continuous oscillation of fluid without external energy input, realization of the effect of intensified mixing, and realization of the advantages of an active micromixer and a traditional passive mixer.

The invention adopts the following technical scheme: a passive continuous oscillation jet micromixer comprises a plurality of flat plate type mixing units and an upper cover plate which are sequentially and closely attached and connected from bottom to top. Each flat plate type mixing unit has the same structural distribution and comprises 4 feed inlets, 4 feed channels, 1 clash oscillating cavity, 4 elliptic mixing cavities and 4 discharge outlets, wherein the opening end of the shrinkage feed channel is connected with the feed inlets, and the shrinkage end of the shrinkage feed channel is connected with the clash oscillating cavity; one end of the mixing cavity is connected with the clash oscillating cavity, and the other end is connected with the discharge hole. 4 flows of fluid to be mixed enter through the feed inlet of the lowest mixing unit, and flow out through the 4 discharge outlets of the upper cover plate after passing through the mixing units to finish the mixing process.

Furthermore, each mixing unit has the same symmetrical structure, fluid forms jet flow through 4 shrinkage feed channels distributed in a cross mode, the jet flow oscillates after collision of the unit center due to instability of the jet flow, and vortex which turns alternately is formed to enter the elliptical mixing cavity, so that the contact area and convection intensity between the fluids are remarkably increased. The connection superposition of a plurality of mixing units repeatedly induces the jet oscillation process, so that the continuous oscillation mixing of the fluid is realized.

Further, between the adjacent flat plate type mixing units, the discharge port of the last mixing unit is connected with the feed channel of the next mixing unit, namely, the channel structure rotates for 45 degrees by taking the center of the collision oscillating cavity as an axis relative to the last mixing unit; the plurality of flat plate type mixing units and the upper cover plate are sequentially connected, the number n of the mixing units is more than or equal to 2, and the connection superposition of the plurality of mixing units repeatedly induces the jet oscillation process, so that the continuous oscillation mixing of fluid is realized.

Further, on each flat mixing unit, 4 feeding channels are arranged in a cross shape, adjacent feeding channels are mutually vertical, and the spaced feeding channels are collinear to form two pairs of fluid which collide head on. The 4 elliptic mixing cavities are respectively positioned between every two adjacent feeding channels and are mutually perpendicular, and the included angle between each elliptic mixing cavity and each adjacent feeding channel is 45 degrees. The feeding channel and the discharging channel are converged to a collision oscillating cavity in the center of the flat plate, and the distance from the center of the collision oscillating cavity to the front end of the feeding channel is equal to the distance from the center of the collision oscillating cavity to the tail end of the elliptic mixing cavity, so that the whole mixing unit layout is centrosymmetric.

Further, on each flat mixing unit, the cross section of the feeding channel parallel to the mixing unit is trapezoidal, the width of the 4 feeding channels is gradually reduced along the flowing direction, the tail end of the feeding channel is led to the collision cavity, and the size (equal to the distance between two opposite feeding channels) of the collision cavity is at least 5 times larger than the width of the shrinkage end of the feeding channel, so that jet flow is formed and instability of the jet flow is induced. The 4 feeding channels have the same length and the same shape; the cross section of the elliptic mixing cavity parallel to the mixing unit is elliptic, one end along the major axis of the ellipse is connected with the clash oscillating cavity, the other end is connected with the discharge port, and the 4 elliptic mixing cavities are identical in size and shape. The width of the junction (inlet) of the mixing chamber and the impinging oscillation chamber should also be at least 5 times greater than the width of the converging end of the feed channel, and the whole is approximately elliptical so that the vibrating fluid is fully developed. The tail end of the mixing cavity is a circular discharge hole, the radius of the circular discharge hole is the same as that of the feed inlet, and the fluid can conveniently enter the next mixing unit.

According to the method for mixing fluid in the passive continuous oscillation jet micromixer, fluid enters through a feed inlet of a first mixing unit, jet flow is induced through 4 shrinkage feed channels distributed in a cross manner, jet flow oscillation is induced in a collision oscillation cavity, and then the fluid enters into 4 elliptic mixing cavities from the collision oscillation cavity to be developed into vortex oscillation mixing, so that a passive continuous oscillation jet flow micromixing process in the first mixing unit is completed; furthermore, the fluid enters the next mixing unit and the subsequent mixing units from the discharge port of the first mixing unit, namely, the connection superposition of a plurality of mixing units repeatedly induces the jet oscillation process, so that the continuous oscillation mixing of the fluid is realized; finally, the fluid flows out from four discharge holes of the upper cover plate to complete the mixing process. The invention can induce the fluid passive continuous oscillation without external energy input.

The invention has the following advantages after adopting the scheme:

1. the invention increases the flow velocity of the fluid after passing through the contracted feeding channel, improves the local Reynolds number, ejects the fluid in the collision cavity with relatively large size to form jet flow, and the multiple jet flows are converged and collided to increase the turbulent intensity of the flow field.

2.4 fluid meet in the collision cavity of the unit center through the feed channel, so that jet instability is induced, after each fluid rushing out of the feed channel collides with the other 3 fluids, the fluid alternately enters into the elliptical mixing cavities at two sides to form periodic oscillation, and at the moment, different fluids are continuously staggered with each other, so that the contact area between the fluids is remarkably increased. This effect increases with increasing oscillation frequency.

3. The fluid enters the mixing cavity in the form of alternating vortex, and due to the oval structure of the mixer, the vortex further develops in the channel to drive the surrounding fluid to rotate, so that the convection intensity of the fluid is obviously improved, and the rapid mixing of the fluid is promoted.

5. The mixer has simple structure, does not contain complex structures such as a baffle or a large-curvature channel, effectively controls the pressure drop loss of fluid, and has less dead zone.

6. The mixing mechanism is based on an instantaneous change flow field, and the oscillation direction of jet flow and the rotation direction of vortex flow are periodically changed along with time, so that the dead zone range and the occurrence probability can be effectively reduced.

7. The mixer can be conveniently coupled with a plurality of flat mixing units, and can repeatedly trigger the jet oscillation process in the plurality of mixing units, thereby improving the mixing efficiency.

8. The oscillation frequency and mixing efficiency of the mixer fluid of the invention are increased along with the reduction of the overall size of the reactor, and meet the miniaturization trend of equipment and the requirement of micromixing.

Drawings

Fig. 1 is a three-dimensional block diagram of a mixer of the present invention. Wherein, 1-1 is 4 feed inlets, 1-2 is a first mixing unit, 1-3 is a second mixing unit, 1-4 is a third mixing unit, 1-5 is an upper cover plate, and 1-6 positions are 4 final discharge outlets;

fig. 2 is a top view of the mixing unit. Wherein 2-1 to 2-4 are shrinkage feeding channels, 2-5 are clash oscillating cavities, 2-6 to 2-9 are elliptic mixing cavities, and 2-10 to 2-13 are discharge holes;

fig. 3 is a side view of the mixing unit, wherein reference numerals are as in fig. 1, 2;

FIG. 4 is a schematic diagram of the principle of periodic oscillatory flow of fluid in a mixing unit;

FIG. 5 is a distribution diagram of mass fraction in a micromixer according to example 1;

FIG. 6 is a distribution diagram of mass fraction in a micromixer according to example 2.

Detailed Description

The following non-limiting examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way.

A passive continuous oscillation jet micromixer is composed of a plurality of flat-plate mixing units and an upper cover plate, as shown in fig. 1, 2 and 3 (1 mixing unit in the following example 1 and 3 mixing units in the following example 2), all the flat plates have the same size and are tightly combined from bottom to top. Between the plurality of flat plate type mixing units, the discharge port 2-10-2-13 of the last mixing unit is aligned and connected with the feed port 1-1 of the next mixing unit, namely, the channel structure rotates 45 degrees by taking the center of the collision oscillating cavity 2-5 as an axis relative to the last mixing unit, and the feed port 1-1 and the discharge port 2-10-2-13 are equal-radius cylindrical channels. The fluid to be mixed enters the mixer from 4 feed inlets 1-1 below the first mixing unit 1-2, passes through a plurality of mixing units 1-2-1-4, and finally flows out from 4 discharge outlets 1-6 of the upper cover plate to finish mixing after the intensive mixing process caused by jet oscillation occurs in each mixing unit.

Each mixing unit has the same channel structure and comprises 4 feed inlets 1-1, 4 feed channels 2-1-2-4, 1 collision oscillating cavity 2-5,4 elliptic mixing cavities 2-6-2-9 and 4 discharge outlets 2-10-2-13. The 4 feed channels 2-1 to 2-4 are arranged in a cross shape, adjacent feed channels are mutually vertical, and the spaced feed channels are collinear to form two pairs of fluid which collide head on. The section of the feed channels 2-1 to 2-4 parallel to the mixing unit is trapezoidal, and the lengths of the 4 feed channels 2-1 to 2-4 are the same, and the shapes are full. The distance from the center of the collision oscillating cavity 2-5 to the front end of the feeding channel 2-1-2-4 is equal to the distance from the front end of the feeding channel 2-1-2-4 to the tail end of the elliptic mixing cavity 2-6-2-9, so that the whole mixing unit layout is centrosymmetric. The section of the feeding channels 2-1-2-4 parallel to the mixing unit is trapezoidal, one end of the feeding channels 2-1-2-4 is connected with the feeding port 1-1, the other end of the feeding channels gradually contracts and is connected to the collision oscillating cavity 2-5, the widths of the 4 feeding channels 2-1-2-4 gradually decrease along the flowing direction, and the tail ends of the feeding channels are led to the collision oscillating cavity 2-5. The cross section of the elliptic mixing cavity 2-6-2-9 parallel to the mixing unit is elliptic, one end along the major axis of the ellipse is connected with the clash oscillating cavity 2-5, the other end is connected with the discharge hole, and the size of the 4 elliptic mixing cavities 2-6-2-9 is the same, and the shape is full. The size of the impinging oscillating chamber 2-5 (which is equal to the distance between the two opposing feed channels 2-1-2-4) is at least 5 times larger than the width of the converging ends of the feed channels 2-1-2-4 to form a jet and to induce jet instability. The 4 elliptic mixing chambers 2-6 to 2-9 are clamped between every 2 feeding channels 2-1 to 2-4, and form an included angle of 45 degrees with the adjacent feeding channels 2-1 to 2-4. The width of the joint of the elliptic mixing chambers 2-6 to 2-9 and the clash oscillating chamber 2-5 is at least 5 times larger than the width of the contraction end of the feeding channels 2-1 to 2-4. I.e. the channel structure is rotated 45 degrees about the center of the impinging oscillating cavity with respect to the previous mixing unit.

According to the method for mixing the fluid in the passive continuous oscillation jet micromixer, the fluid enters through the 4 initial feed inlets 1-1 of the first mixing unit 1-2, two pairs of fluid which collide head on are formed through the 4 feed channels 2-1-2-4 which are distributed in a cross manner, jet flow is initiated, and the fluid is injected into the collision oscillation cavity 2-5. The fluid is redistributed into the 4 elliptic mixing chambers 2-6-2-9 after the interaction of jet oscillation is induced in the collision oscillating chamber 2-5, and the fluid is developed into vortex oscillation mixing. The fluid flows out from the discharge port 2-10-2-13 after being further mixed in the elliptical oscillation cavity 2-6-2-9, and the passive continuous oscillation jet micro-mixing process in the first mixing unit 1-2 is completed. Furthermore, the fluid enters the next second mixing unit 1-3 and the subsequent third mixing unit 1-4 from the discharge port of the first mixing unit 1-2, and the fluid oscillation effect occurs again, so that the continuous oscillation reinforced mixing effect is realized. Finally, the fluid flows out from the four final discharging holes 1-6 of the upper cover plate 1-5 to finish the mixing process.

The mechanism of mixing enhancement of the fluid in the mixing unit is shown in fig. 4. The fluid forms jet flow after passing through the shrinkage feed channels 2-1 to 2-4, the fluid collides and interacts in the collision oscillating cavity 2-5, and the fluid cannot maintain steady-state flow due to the instability of the jet flow, but forms transient periodic oscillation. Taking an oscillation period T as an example, in the period of 0-0.5T, fluid ejected from the feeding channels 2-1-2-4 deviates along the left side of the fluid and enters the left elliptical mixing cavity 2-6-2-9, and a clockwise rotating vortex is formed at the center of the cavity. In the period of 0.5-1T, the fluid ejected from the feeding channels 2-1-2-4 is deviated along the right side of the feeding channels, enters the right elliptical mixing cavity 2-6-2-9, and forms a vortex rotating anticlockwise at the center of the cavity. The periodic oscillation characteristic enables the fluid flowing out from the adjacent feed channels 2-1-2-4 to alternately enter the middle elliptic mixing cavities 2-6-2-9, so that the contact area of two fluids is greatly increased, and the mixing efficiency is effectively improved. On the other hand, the fluid entering the elliptic mixing cavities 2-6-2-9 deviates along the elliptic wall surface under the action of centrifugal force and forms vortex, the vortex continuously develops in the elliptic mixing cavities 2-6-2-9, the surrounding fluid is subjected to rotary stirring, and the convection intensity in the cavities is obviously improved. Along with the oscillation of the fluid in the clash oscillation cavity 2-5, the rotation direction of the vortex is also changed alternately, the instantaneous change of the flow field improves the mixing efficiency and reduces the occurrence probability of dead zones. The oscillation frequency of the fluid can be adjusted by changing the dimensions of the feed channels 2-1 to 2-4, the impinging oscillation cavity 2-5 and the elliptical mixing cavities 2-6 to 2-9 of the mixing unit to achieve optimal mixing efficiency.

Example 1

In this example, the mixing performance of a passive oscillating micromixer consisting of a single mixing unit was tested, and the dimensions of the flat plate unit were 12.5mm×12.5mm×1mm. The depth of the mixing unit channels on the plate is 0.5mm, the lengths of the 4 feeding channels 2-1 to 2-4 are 3.5mm, one ends of the feeding channels 2-1 to 2-4 are connected with the feeding port 1-1, and the other ends of the feeding channels gradually shrink to 0.2mm. The size of the collision oscillating chamber 2-5 (i.e., the distance between the two facing feed channels 2-1 to 2-4) is 1.5mm. The 4 elliptic mixing cavities 2-6-2-9 are positioned between every 2 feeding channels 2-1-2-4, an included angle of 45 degrees is formed between each two adjacent feeding channels 2-1-2-4, the short axis size of each elliptic mixing cavity 2-6-2-9 is 2.25mm, the tail ends of each elliptic mixing cavity 2-6-2-9 are connected with the discharge ports 2-10-2-13, and the center of each discharge port 2-10-2-13 is 4.25mm away from the center of the mixing unit. The feed inlet 1-1 and the discharge outlet 2-10-2-13 are cylindrical, the diameter is 0.5mm, and the depth is 1mm and 0.5mm respectively.

The mixing effect of example 1 is shown in FIG. 5, wherein a fluid A (0.1 g/L of resazurin aqueous solution, solute mass fraction set to 1) enters from the left and right feed channels 2-1, 2-3 of the first mixing unit 1-2, a fluid B (water, solute mass fraction 0) enters from the upper and lower feed channels 2-2, 2-4 of the first mixing unit 1-2, and the inlet average flow rate is 0.1m/s, and the equivalent Reynolds number is 50. The fluids meet and mix in the impinging oscillation chambers 2-5, the mixing effect is characterized by the degree of homogeneity of the solute mass fraction (C), and the mixing factor is calculated according to the following formula.

Wherein sigma represents the standard deviation of the concentration of solute at the outlet, sigma _max The standard deviation of the concentration at which no mixing occurred (here, the value 0.5). According to this definition, mi=1 represents complete mixing, and mi=0 is complete unmixed.

The fluid oscillates in the collision oscillating cavity 2-5, the oscillating frequency is about 10Hz, the mass fraction distribution of the solute is related to the motion state of the fluid, the periodic evolution rule is matched with the flow schematic diagram of fig. 4, the solute alternately rotates along with the periodically turned vortex to enter the elliptical mixing cavity 2-6-2-9 for mixing, the average mixing factor at the outlet reaches 0.78, and the mixing reinforcement is realized.

Example 2

The microreactor of the example taken is as shown in FIG. 1 and comprises 3 flat-plate mixing units (namely a first mixing unit 1-2, a second mixing unit 1-3 and a third mixing unit 1-4) and 1 upper cover plate 1-5, wherein the sizes of the four flat-plate mixing units are 12.5mm multiplied by 1mm. The geometry and dimensions of the mixing unit were substantially the same as in example 1, except that the width at the interface of the ends of the feed channels 2-1 to 2-4 and the impinging oscillating chamber 2-5 was reduced to 0.1mm.

The mixing effect of example 2 is shown in fig. 6, fluid a (0.1 g/L resazurin aqueous solution, solute mass fraction is set to 1) enters from the left and right feed channels 2-1, 2-3 of the first mixing unit 1-2, fluid B (water, solute mass fraction is 0) enters from the upper and lower feed channels 2-2, 2-4 of the first mixing unit 1-2, inlet average flow rate is 0.075m/s, equivalent reynolds number is 37.5, fluid meets and mixes in the collision oscillating cavity 2-5, and after passing through the second mixing unit 1-3 and the third mixing unit 1-4 in turn, the mixing effect is characterized by the uniformity of solute mass fraction (C). From the results in the figure, it can be seen that the oscillation effect of the fluid occurs in each unit, and the oscillation frequency of the fluid is increased to 48Hz due to the reduction of the jet width, and the mixing efficiency is remarkably improved compared with that of the embodiment 1. Under the action of fluid oscillation and vortex, the fluid is well mixed when leaving the unit 1 (the first mixing unit 1-2), and the mixing factor at the outlet is 0.9; the fluids have substantially mixed by the time they leave unit 2 (second mix 1-3), the mixing factor at the outlet being close to 0.97; the solute mass fractions tend to be equal everywhere in the third mixing unit 3 (third mixing unit 1-4), the outlet mixing factor is close to 1, and thorough mixing is achieved.

Claims (6)

1. A passive continuous oscillation jet micromixer comprises a plurality of flat mixing units and an upper cover plate, and is characterized in that: a plurality of flat plate type mixing units (1-2-1-4) and an upper cover plate (1-5) are sequentially and tightly attached, and each mixing unit sequentially consists of 4 shrinkage feeding channels (2-1-2-4) which are distributed in a cross manner, 1 collision oscillating cavity (2-5) and 4 elliptic mixing cavities (2-6-2-9); the opening end of the feeding channel is connected with the feeding port (1-1), and the contraction end is connected with the clash oscillating cavity (2-5); one end of the elliptic mixing cavity (2-6-2-9) is connected with the clash oscillating cavity (2-5), and the other end is connected with the discharge port (2-10-2-13).

2. The micromixer according to claim 1, wherein: the section of the feed channels (2-1-2-4) parallel to the mixing unit is trapezoidal, the width of the feed channels (2-1-2-4) is gradually narrowed along the axial direction, and the lengths of the 4 feed channels (2-1-2-4) are the same, and the shapes are full; the cross section of the elliptic mixing cavity (2-6-2-9) parallel to the mixing unit is elliptic, one end along the major axis of the ellipse is connected with the clash oscillating cavity (2-5), the other end is connected with the discharge port (2-10-2-13), and the 4 elliptic mixing cavities (2-6-2-9) have the same size and the same shape.

3. The micromixer according to claim 1, wherein: the 4 feeding channels (2-1 to 2-4) are arranged in a cross shape, the adjacent feeding channels (2-1 to 2-4) are mutually vertical, and the feeding channels (2-1 to 2-4) are collinear at intervals; the 4 elliptic mixing cavities (2-6-2-9) are clamped between every two feeding channels (2-1-2-4) and are mutually perpendicular to each other, and an included angle between each two elliptic mixing cavities and each two adjacent feeding channels (2-1-2-4) is 45 degrees; the feeding channels (2-1-2-4) and the elliptic mixing cavities (2-6-2-9) are converged in the collision oscillating cavity (2-5), the distance from the center of the collision oscillating cavity (2-5) to the front end of the feeding channels (2-1-2-4) is equal to the distance from the front end of the elliptic mixing cavity (2-6-2-9), and the whole mixing unit structure is symmetrical with the collision oscillating cavity (2-5) as the center.

4. The micromixer according to claim 1, wherein: the size of the collision mixing cavity (2-5), namely the distance between two opposite feeding channels (2-1-2-4) is larger than 5 times the width of the contraction end of the feeding channel (2-1-2-4); the width of the inlet of the elliptic mixing cavity (2-6-2-9) is larger than 5 times of the width of the contraction end of the feeding channel (2-1-2-4).

5. The micromixer according to claim 1, wherein: the discharge port (2-10-2-13) of the upper mixing unit is connected with the feed port (1-1) of the lower mixing unit, namely, the channel structure rotates for 45 degrees by taking the center of the collision oscillating cavity (2-5) as an axis relative to the upper mixing unit; the plurality of flat plate type mixing units are sequentially connected with one upper cover plate 1-5, and the number n of the mixing units is more than or equal to 2.

6. A method of mixing fluids in a passive continuously oscillating jet micromixer according to any one of claims 1 to 5, wherein: fluid enters through a feed inlet (1-1) of a first mixing unit, jet flow is induced through 4 shrinkage feed channels (2-1-2-4) which are distributed in a cross manner, jet flow oscillation is induced in a collision oscillating cavity (2-5), and then the fluid enters 4 elliptic mixing cavities (2-6-2-9) from the collision oscillating cavity (2-5) to be mixed in a vortex oscillation manner, so that a passive continuous oscillation jet flow micromixing process in the first mixing unit is completed; furthermore, the fluid enters the subsequent mixing units from the discharge port (2-10-2-13) of the first mixing unit and is subjected to an oscillating mixing process again, namely, the connection and superposition of a plurality of mixing units repeatedly trigger a jet flow oscillating process, so that the continuous oscillating mixing of the fluid is realized; finally, the fluid flows out from four final discharge holes (1-6) of the upper cover plate (1-5) to complete the mixing process.

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