CN116173800A - Passive continuous oscillation jet micromixer - Google Patents

Abstract

The invention discloses a passive continuous oscillating jet micro-mixer, which is composed of a plurality of flat-plate mixing units and upper cover plates sequentially combined. The fluid flows in from the inlet of the first mixing unit, and after passing through multiple mixing units, it flows out from the outlet of the upper cover plate to complete the mixing process. Each of the mixing units has the same symmetrical structure, and the fluid passes through four contracting feeding channels arranged in a cross to form a jet. Due to the instability of the jet, the jet oscillates after colliding with the center of the unit, forming an alternately turning vortex into the ellipse. The mixing chamber significantly increases the contact area and convection strength between fluids. Between adjacent mixing units, the discharge port of the previous mixing unit is connected to the feed channel of the next unit, and the connection and superposition of multiple mixing units repeatedly triggers the jet oscillation process to realize continuous oscillation mixing of fluids. The invention can induce fluid passive continuous oscillation without external energy input, has less pressure drop dead zone, and can realize high-efficiency mixing of microfluids.

Description

A Passive Continuous Oscillating Jet Micromixer

technical field

The invention relates to the field of microfluid mixing in microfluidic chips and microchemical equipment, in particular to a passive fluid continuous oscillating micromixer based on the instability of colliding jets.

Background technique

Micromixers are important components of biological microfluidic equipment and chemical microreactor systems. At the microscale, due to the limitation of channel size, the fluid flows in a laminar flow under low Reynolds number conditions, and the mixing between fluids is dominated by molecular diffusion. Therefore, an additional micro-mixer is needed to increase the convective chaos of the fluid and enhance the system. the mixing efficiency.

Common micromixers can be divided into two categories: active micromixers and passive micromixers. The active micromixer disturbs the fluid in the microchannel by adding external driving equipment (such as ultrasonic, microwave, magnetic force, etc.), and the external excitation applied by it is generally time-varying, causing the fluid in the microchannel to move instantaneously or Oscillation, so the mixing effect is significantly improved, while reducing the flow dead zone and the probability of clogging. For example, the mixer disclosed in Chinese patent document CN103638837A combines a piezoelectric vibrator with a fluid channel to actively promote fluid mixing. However, the cost of active micro-mixers is high, the integration with the original equipment is complicated, and the energy conversion rate of the external field is low, so it is difficult to apply on a large scale.

Passive micro-mixers do not need to add additional equipment, but rely on the design of a special micro-channel structure to change the fluid movement mode in the channel, increase the effective contact area between fluids, shorten the distance of molecular diffusion, and improve the mixing performance. Compared with active mixers, passive micromixers have been widely used due to their simple implementation, easy integration, and no need for additional energy input. However, the current design of passive micro-mixing mostly adopts the form of changing the curvature of the channel shape (such as the mixer disclosed in Chinese patent document CN103638853A) or setting the internal stopper of the channel (such as the mixer disclosed in Chinese patent document CN105771765A), and the low Reynolds number condition The downstream flow field tends to be in a steady state, and complex channel structures need to be repeatedly set up to increase the mixing intensity, and the local steady-state vortex is easy to form a dead zone, and the fluid frequently collides with the stopper and the friction of the curved surface leads to a large 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, and the passive oscillation of the fluid can be induced through a special channel structure, the performance of the mixer will be greatly improved, and the application range of the passive micro-mixer will be broadened. Improve real work and productivity.

Contents of the invention

In order to solve the above technical problems, the present invention proposes a passive continuous oscillating micro-mixer based on the instability of colliding jets, which has a simple structure and is easy to process, and can induce spontaneous continuous oscillation of the fluid without external energy input to achieve enhanced mixing The effect of both the active micro-mixer and the advantages of the traditional passive mixer.

The present invention adopts the following technical solutions: a passive continuous oscillating jet micro-mixer, which comprises a plurality of flat-plate mixing units and an upper cover plate which are sequentially closely fitted and connected from bottom to top. Each of the flat plate mixing units has the same structural distribution, including 4 feed inlets, 4 feed channels, 1 collision oscillation chamber, 4 elliptical mixing chambers and 4 discharge ports, shrinking feed channels The opening end of the mixing chamber is connected with the feeding port, and the constricted end of the shrinking feeding channel is connected with the collision oscillation chamber; one end of the mixing chamber is connected with the collision oscillation chamber, and the other end is connected with the discharge port. The 4 fluids to be mixed enter through the inlet of the bottom mixing unit, and after passing through multiple mixing units, they flow out from the 4 outlets of the upper cover to complete the mixing process.

Furthermore, each mixing unit has the same symmetrical structure, and the fluid passes through four constricted feeding channels arranged in a cross to form jets. Due to the instability of the jets, the jets oscillate after colliding at the center of the unit, forming alternately turning vortices Entering the elliptical mixing chamber, the contact area and convection intensity between fluids are significantly increased. The connection and superposition of multiple mixing units repeatedly triggers the jet oscillation process to realize the continuous oscillation mixing of the fluid.

Further, between adjacent flat-plate mixing units, the discharge port of the previous mixing unit is connected to the feed channel of the next mixing unit, that is, relative to the previous mixing unit, the channel structure rotates 45° with the center of the collision oscillation chamber as the axis. Degree; multiple flat mixing units and an upper cover are connected in sequence, the number of mixing units is n≥2, and the connection and superposition of multiple mixing units repeatedly triggers the jet oscillation process to realize continuous oscillation mixing of fluids.

Further, on each flat plate mixing unit, 4 feeding channels are arranged in a cross, adjacent feeding channels are perpendicular to each other, and the separated feeding channels are collinear, forming two pairs of head-on-colliding fluids. The four elliptical mixing chambers are respectively located between every two adjacent feed channels, perpendicular to each other, and the angle between them and the adjacent feed channels is 45 degrees. The feed channel and the discharge channel converge into the colliding oscillation chamber at the center of the plate, and the distance from the center of the colliding oscillation chamber to the front end of the feed channel is equal to the distance from it to the end of the elliptical mixing chamber, so that the layout of the entire mixing unit is centrally symmetrical.

Further, on each flat plate mixing unit, the feed channel parallel to the cross section of the mixing unit is trapezoidal, the width of the four feed channels gradually decreases along the flow direction, and the end leads to the collision chamber, and the collision chamber The dimension (equal to the distance between two facing feed channels) is at least 5 times greater than the width of the constricted ends of the feed channels to form jets and induce jet instability. The 4 feeding channels have the same length and congruent shape; the elliptical mixing chamber is elliptical in parallel to the section of the mixing unit, one end along the long axis of the ellipse is connected to the collision oscillation chamber, and the other end is connected to the discharge port, and the 4 elliptical elliptical The mixing chambers are of the same size and congruent in shape. The width of the junction (inlet) between the mixing chamber and the collision oscillation chamber should also be at least 5 times larger than the width of the constricted end of the feed channel, and the overall shape should be approximately elliptical so that the vibrating fluid can fully develop. The end of the mixing chamber is a circular discharge port with the same radius as the feed port, which facilitates the fluid to enter the next mixing unit.

The method for mixing fluid in the passive continuous oscillating jet micro-mixer of the present invention, the fluid enters through the feed port of the first mixing unit, the jet is induced through four contracting feed channels arranged in crosses, and the jet is induced to oscillate in the collision oscillation cavity, Then, the fluid enters the four elliptical mixing chambers from the collision oscillation chamber and develops into vortex oscillation mixing, completing the passive continuous oscillating jet microscopic mixing process in the first mixing unit; then, the fluid enters the next mixing unit from the outlet of the first mixing unit The mixing unit and the subsequent mixing unit, that is, the connection and superposition of multiple mixing units repeatedly trigger the jet oscillation process to realize the continuous oscillation mixing of the fluid; finally, the fluid flows out from the four outlets of the upper cover to complete the mixing process. The invention can induce passive continuous oscillation of the fluid without external energy input.

The present invention has the following advantages after adopting the above scheme:

1. The present invention increases the flow velocity of the fluid after passing through the shrinking feed channel, increases the local Reynolds number, and sprays it out in a relatively large-sized collision chamber to form a jet. Multiple jets converge and collide, increasing the turbulent intensity of the flow field .

2. Four streams of fluids meet in the collision chamber in the center of the unit through the feed channel, causing the instability of the jet flow. After each fluid rushing out of the feed channel collides with the other 3 streams of fluid, it enters the elliptical mixing chamber on both sides alternately , forming a periodic oscillation. At this time, different fluids continue to intersect with each other, which significantly increases the contact area between fluids. This effect increases with increasing oscillation frequency.

3. The fluid enters the mixing chamber in the form of alternating vortex. Due to the elliptical structure of the mixer, the vortex further develops in the channel, driving the surrounding fluid to rotate, which significantly improves the fluid convection intensity and promotes rapid fluid mixing.

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

6. The mixing mechanism of the present invention is based on the instantaneously changing flow field, and the oscillation direction of the jet and the rotation direction of the vortex are periodically changed with time, which can effectively reduce the dead zone range and occurrence probability.

7. The mixer of the present invention can be conveniently coupled to a plurality of flat mixing units, and can repeatedly induce the jet oscillation process in a plurality of mixing units to improve mixing efficiency.

8. The oscillation frequency and mixing efficiency of the mixer fluid of the present invention increase with the reduction of the overall size of the reactor, which meets the trend of equipment miniaturization and the demand for microscopic mixing.

Description of drawings

Fig. 1 is a three-dimensional structure diagram of the mixer of the present invention. Among them, 1-1 is 4 feeding ports, 1-2 is the first mixing unit, 1-3 is the second mixing unit, 1-4 is the third mixing unit, 1-5 is the upper cover plate, 1-6 The position is 4 final outlets;

Figure 2 is a top view of the mixing unit. Among them, 2-1 to 2-4 are shrinkage feeding channels, 2-5 is a collision oscillation chamber, 2-6 to 2-9 are oval mixing chambers, and 2-10 to 2-13 are discharge ports;

Fig. 3 is a side view of the mixing unit, wherein the meanings of the symbols are the same as Fig. 1 and Fig. 2;

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

Fig. 5 is the fluid mass fraction distribution figure in the micro-mixer in embodiment 1;

FIG. 6 is a distribution diagram of fluid mass fraction in the micro-mixer in Example 2. FIG.

Detailed ways

The following non-limiting examples can enable those skilled in the art to understand the present invention more fully, but do not limit the present invention in any way.

A passive continuous oscillating jet micro-mixer, consisting of a plurality of flat plate mixing units and an upper cover plate, as shown in Figures 1, 2 and 3 (the following embodiment 1 contains 1 mixing unit, and embodiment 2 contains 3 mixed units), all plates have the same size, and are tightly combined from bottom to top. Between multiple flat-plate mixing units, the discharge ports 2-10 to 2-13 of the previous mixing unit are aligned and connected to the feed port 1-1 of the next mixing unit, that is, compared to the previous mixing unit, the channel structure is The center of the collision oscillation cavity 2-5 is rotated by 45 degrees as the axis, and the feed inlet 1-1 and the discharge outlets 2-10-2-13 are cylindrical channels with equal radii. The fluid to be mixed enters the mixer from the four feed ports 1-1 below the first mixing unit 1-2, passes through multiple mixing units 1-2 to 1-4, and the jet vibration caused by jet oscillation occurs in each mixing unit. After intensifying the mixing process, it finally flows out from the 4 outlets 1-6 of the upper cover plate to complete the mixing.

Each mixing unit has the same channel structure, including 4 feeding ports 1-1, 4 feeding channels 2-1~2-4, 1 collision oscillation chamber 2-5, 4 elliptical mixing chambers 2 -6～2-9 and 4 outlets 2-10～2-13. The 4 feed channels 2-1～2-4 are arranged in a cross, the adjacent feed channels are perpendicular to each other, and the spaced feed channels collinear, forming two pairs of fluids colliding head-on. The feed passages 2-1-2-4 are trapezoidal in section parallel to the mixing unit, and the four feed passages 2-1-2-4 have the same length and congruent shape. The feed channels 2-1-2-4 and the discharge channels converge to the colliding oscillation chamber 2-5 at the center of the plate, and the distance from the center of the colliding oscillation chamber 2-5 to the front end of the feed channel 2-1-2-4 is equal to The distance from it to the ends of the elliptical mixing chambers 2-6 to 2-9 makes the layout of the entire mixing unit symmetrical to the center. The feed channels 2-1~2-4 are parallel to the cross section of the mixing unit and are trapezoidal. One end of the feed channels 2-1~2-4 is connected to the feed port 1-1, and the other end gradually shrinks and is connected to the collision oscillation chamber 2. -5, the widths of the four feeding channels 2-1 to 2-4 gradually decrease along the flow direction, and the ends lead to the collision oscillation chamber 2-5. The elliptical mixing chamber 2-6~2-9 is elliptical in parallel to the section of the mixing unit, one end along the long axis of the ellipse is connected to the collision oscillation chamber 2-5, and the other end is connected to the discharge port 2-10~2-13 , 4 elliptical mixing chambers 2-6 to 2-9 have the same size and congruent shape. The size of the collision oscillation cavity 2-5 (equal to the distance between two opposite feed channels 2-1 to 2-4) is at least 5 times greater than the width of the constricted ends of the feed channels 2-1 to 2-4, so as to form jets and trigger jet instability. 4 elliptical mixing chambers 2-6~2-9 are sandwiched between every 2 feeding channels 2-1~2-4, and the angle between the adjacent feeding channels 2-1~2-4 is 45 degrees . The width of the connection between the elliptical mixing chamber 2-6-2-9 and the collision oscillation chamber 2-5 should also be at least 5 times the width of the constricted end of the feed channel 2-1-2-4. That is, relative to the previous mixing unit, the channel structure rotates 45 degrees around the center of the collision oscillation cavity.

In the above-mentioned method of mixing fluid in the passive continuous oscillating jet micro-mixer, the fluid enters through the four initial feed ports 1-1 of the first mixing unit 1-2, and passes through the four cross-arranged feed channels 2-1~2 -4 forms two pairs of fluids that collide head-on, trigger jets, and inject into the collision oscillation cavity 2-5. Fluid redistributes into the four elliptical mixing chambers 2-6-2-9 after the interaction that induces jet oscillation in the collision oscillation chamber 2-5 and develops into vortex oscillation mixing. The fluids are further mixed in the elliptical oscillation chambers 2-6 to 2-9 and then flow out from the discharge ports 2-10 to 2-13, completing the passive continuous oscillating jet microscopic mixing process in the first mixing unit 1-2. 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, realizing the effect of continuous oscillation and enhanced mixing. Finally, the fluid flows out from the four final outlets 1-6 of the upper cover plate 1-5 to complete the mixing process.

The mixing enhancement mechanism of the fluid in the mixing unit is shown in Figure 4. The fluid forms a jet after passing through the shrinking feed channels 2-1 to 2-4, and the fluid collides and interacts in the collision oscillation chamber 2-5. Due to the instability of the jet, the fluid cannot maintain a steady flow, but forms a a transient periodic oscillation. Taking an oscillation period T as an example, during the period of 0-0.5T, the fluids ejected from the feed channels 2-1-2-4 deviate along the left side and enter the left elliptical mixing chambers 2-6-2- 9. A clockwise vortex is formed in the center of the cavity. During the period of 0.5-1T, the fluids ejected from the feed channels 2-1-2-4 deviate along the right side instead, and enter the oval mixing chamber 2-6-2-9 on the right side, forming an inversion in the center of the chamber. A vortex that rotates clockwise. The periodic oscillation characteristic makes the fluids flowing out from the adjacent feeding channels 2-1～2-4 alternately enter the middle elliptical mixing chamber 2-6～2-9, which will greatly increase the contact area of the two fluids, Effectively improve mixing efficiency. On the other hand, the fluid entering the elliptical mixing chamber 2-6～2-9 deviates along the elliptical wall surface under the action of centrifugal force and forms a vortex, and the vortex continuously develops in the elliptical mixing chamber 2-6～2-9 , to rotate and stir the surrounding fluid, and significantly improve the convection intensity in the cavity. With the oscillation of the fluid in the collision oscillation chamber 2-5, the rotation direction of the vortex is also alternately changed, and the instantaneous change of the flow field improves the mixing efficiency and reduces the occurrence probability of the dead zone. The oscillation frequency of the fluid can be adjusted by changing the size of the mixing unit feed channel 2-1~2-4, the collision oscillation chamber 2-5 and the oval mixing chamber 2-6~2-9 to achieve optimal mixing efficiency.

Example 1

In this embodiment, a mixing performance test is performed on a passive oscillating micro-mixer composed of a single mixing unit, and the size of the flat unit is 12.5 mm×12.5 mm×1 mm. The channel depth of the mixing unit on the board is 0.5mm, the length of the four feeding channels 2-1~2-4 is 3.5mm, one end of the feeding channel 2-1~2-4 is connected with the feeding port 1-1, and the other end gradually Shrink to 0.2mm. The size of the collision oscillation chamber 2-5 (that is, the distance between two facing feed channels 2-1 to 2-4) is 1.5 mm. The four elliptical mixing chambers 2-6~2-9 are located between every two feeding channels 2-1~2-4, and the angle between the adjacent feeding channels 2-1~2-4 is 45 degrees , the minor axis dimension of the elliptical mixing chamber 2-6~2-9 is 2.25mm, the end of the elliptical mixing chamber 2-6~2-9 is connected to the discharge port 2-10~2-13, and the discharge port 2-10 ~2-13 centers are 4.25mm from the center of the mixing unit. The feed inlet 1-1 and the feed outlets 2-10 to 2-13 are cylindrical, with a diameter of 0.5mm and a depth of 1mm and 0.5mm respectively.

The mixing effect of embodiment 1 is as shown in Figure 5, fluid A (0.1g/L resazurin aqueous solution, solute mass fraction is set as 1) by the first mixing unit 1-2 left and right feed channel 2-1, 2-3 Entering, fluid B (water, solute mass fraction is 0) enters from the upper and lower feeding channels 2-2 and 2-4 of the first mixing unit 1-2, the average flow velocity at the inlet is 0.1m/s, and the equivalent Reynolds number is 50. The fluids meet and mix in the collision oscillation cavity 2-5. The mixing effect is characterized by the uniformity of the solute mass fraction (C), and the mixing factor is calculated according to the following formula.

Among them, σ represents the standard deviation of the solute concentration at the outlet, and σ _max is the standard deviation of the concentration when no mixing occurs (the value here is 0.5). According to this definition, MI=1 means complete mixing and MI=0 means no mixing at all.

The fluid oscillates in the collision oscillation cavity 2-5, and the oscillation frequency is about 10 Hz. The mass fraction distribution of the solute is related to the motion state of the fluid, and its periodic evolution law is consistent with the flow schematic diagram in Figure 4. The vortex flow alternately rotates into the elliptical mixing chamber 2-6 to 2-9 for mixing, and the measured average mixing factor at the outlet reaches 0.78, realizing mixing intensification.

Example 2

The microreactor of the embodiment taken is the same as shown in Figure 1, including 3 flat plate mixing units (i.e. the first mixing unit 1-2, the second mixing unit 1-3, the third mixing unit 1-4) and 1 upper For cover plates 1-5, the dimensions of the four plates are all 12.5mm×12.5mm×1mm. The geometric structure and size of the mixing unit are basically the same as those in Example 1, the only difference being that the width of the interface between the ends of the feed channels 2-1-2-4 and the collision oscillation chamber 2-5 is reduced to 0.1mm.

The mixing effect of embodiment 2 is as shown in Figure 6, and fluid A (0.1g/L resazurin aqueous solution, solute mass fraction is set as 1) is fed by channel 2-1, 2-3 left and right sides of first mixing unit 1-2 Enter, 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, the average flow velocity at the inlet is 0.075m/s, and the equivalent Reynolds number is 37.5, The fluids meet and mix in the collision oscillation chamber 2-5, and after passing through the second mixing unit 1-3 and the third mixing unit 1-4 in sequence, the mixing effect is characterized by the uniformity of the solute mass fraction (C). It can be seen from the results in the figure that the fluid has an oscillation effect in each unit. Due to the reduction of the jet width, the oscillation frequency of the fluid is increased to 48Hz, and the mixing efficiency is significantly improved compared with Example 1. Under the action of fluid oscillation and vortex, the fluid has been well mixed when it leaves unit 1 (first mixing unit 1-2), and the mixing factor at the outlet is 0.9; the fluid is leaving unit 2 (second mixing unit 1-3) When it is basically mixed, the mixing factor at the outlet is close to 0.97; in the third mixing unit 3 (the third mixing unit 1-4), the solute mass fractions tend to be equal everywhere, and the mixing factor at the outlet is close to 1, which has reached full mixing.

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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