A passive continuous oscillation jet micro-mixer

Abstract

The present invention discloses a passive continuous oscillation jet micro mixer, which is successively composed of a plurality of flat plate type mixing units and an upper cover plate. Fluid flows into from the feed port of the first mixing unit, and after passing through a plurality of mixing units, it flows out from the discharge port of the upper cover plate to complete the mixing process. Each mixing unit has the same symmetric structure. The fluid forms jets through 4 cross-arranged contraction feed channels. Due to the instability of the jets, the jets collide at the center of the unit and then oscillate, forming alternately turning eddy currents that enter the elliptical mixing chamber, significantly increasing the contact area and convection intensity between fluids. Between adjacent mixing units, the discharge port of the previous mixing unit is connected to the feed channel of the next unit. The connection and superposition of multiple mixing units repeatedly trigger the jet oscillation process, realizing the continuous oscillation mixing of fluids. The present invention can trigger the passive continuous oscillation of fluids without external energy input, has low pressure drop and few dead zones, and can achieve efficient mixing of microfluids.

Description

Technical Field

[0001] The present invention relates to the field of microfluidic mixing in microfluidic chips and microchemical equipment, and specifically to a passive fluid continuous oscillation micromixer based on the instability of impinging jets. Background Art

[0002] A micromixer is an important component of a bio-microfluidic device and a chemical microreactor system. At the microscale, due to the limitation of the channel size, the fluid flows in a laminar flow under low Reynolds number conditions, and the mixing between fluids is mainly based on molecular diffusion. Therefore, an additional micromixer is required to increase the convective chaos intensity of the fluid and enhance the mixing efficiency of the system.

[0003] Common micromixers can be divided into two categories: active micromixers and passive micromixers. An active micromixer perturbs the fluid in the microchannel by adding an external driving device (such as ultrasound, microwave, magnetic force, etc.). The externally applied excitation is generally time-varying, which triggers the instantaneous movement or oscillation of the fluid in the microchannel. Therefore, the mixing effect is significantly improved, and at the same time, the range of flow dead zones and the probability of blockage are reduced. For example, the mixer disclosed in Chinese patent document CN103638837A combines a piezoelectric oscillator with a fluid channel to actively promote fluid mixing. However, the active micromixer has a high cost, is complex to integrate with the original equipment, and has a low external field energy conversion rate, making it difficult to be applied on a large scale.

[0004] A passive micromixer does not require additional equipment, but relies on a specially designed microchannel structure to change the fluid motion pattern in the channel, increase the effective contact area between fluids, and shorten the distance of molecular diffusion to improve the mixing performance. Compared with the active mixer, the passive micromixer has the advantages of simple implementation, easy integration, and no additional energy input, and has been widely used. However, the current designs of passive micromixing mostly adopt the form of changing the curvature of the channel shape (such as the mixer disclosed in Chinese patent document CN103638853A) or setting internal blocks in the channel (such as the mixer disclosed in Chinese patent document CN105771765A). Under low Reynolds number conditions, the flow field tends to be steady state, and complex channel structures need to be repeatedly set to increase the mixing intensity. Moreover, local steady-state eddies are likely to form dead zones, and the frequent collision of the fluid with the blocks and the surface friction result in a large pressure drop.

[0005] Therefore, if the characteristics of the time-varying flow field of the active micromixer can be introduced into the passive micromixer, and the fluid is passively oscillated through a special channel structure, the performance of the mixer will be greatly improved, the application range of the passive micromixer will be broadened, and the actual work and production efficiency will be increased. Summary of the Invention

[0006] To solve the above technical problems, the present invention proposes a passive continuous oscillation micro-mixer based on the instability of counter-jet flow. It has a simple structure, is convenient to process, can trigger the spontaneous continuous oscillation of the fluid without external energy input, achieve the effect of enhanced mixing, and combines the advantages of active micro-mixers and traditional passive mixers.

[0007] The present invention adopts the following technical solutions: A passive continuous oscillation jet micro-mixer is composed of multiple flat plate mixing units and an upper cover plate, which are tightly attached and connected in sequence from bottom to top. Each flat plate mixing unit has the same structural distribution, including 4 feed ports, 4 feed channels, 1 counter-jet oscillation cavity, 4 elliptical mixing cavities, and 4 discharge ports. The open end of the converging feed channel is connected to the feed port, and the converging end of the converging feed channel is connected to the counter-jet oscillation cavity; one end of the mixing cavity is connected to the counter-jet oscillation cavity, and the other end is connected to the discharge port. Four fluids to be mixed enter through the feed ports of the lowermost mixing unit, and after passing through multiple mixing units, they flow out through the 4 discharge ports of the upper cover plate to complete the mixing process.

[0008] Furthermore, each mixing unit has the same symmetric structure. The fluid forms jets through 4 cross-arranged converging feed channels. Due to the instability of the jets, the jets oscillate after colliding at the center of the unit, forming alternately turning eddies that enter the elliptical mixing cavity, significantly increasing the contact area and convection intensity between the fluids. The connection and superposition of multiple mixing units repeatedly trigger the jet oscillation process to achieve continuous oscillation mixing of the fluid.

[0009] Furthermore, between adjacent flat plate mixing units, the discharge port of the upper mixing unit is connected to the feed channel of the lower mixing unit, that is, relative to the upper mixing unit, the channel structure rotates 45 degrees around the center of the counter-jet oscillation cavity; multiple flat plate mixing units and an upper cover plate are connected in sequence, and the number of mixing units n≥2. The connection and superposition of multiple mixing units repeatedly trigger the jet oscillation process to achieve continuous oscillation mixing of the fluid.

[0010] Furthermore, on each flat plate mixing unit, the 4 feed channels are arranged in a cross, adjacent feed channels are perpendicular to each other, and the spaced feed channels are collinear, forming two pairs of fluids colliding face to face. The 4 elliptical mixing cavities are respectively located between every two adjacent feed channels, perpendicular to each other, and the angle with the adjacent feed channels is 45 degrees. The feed channels and the discharge channels converge to the counter-jet oscillation cavity at the center of the flat plate. The distance from the center of the counter-jet oscillation cavity to the front end of the feed channel is equal to its distance to the end of the elliptical mixing cavity, making the layout of the entire mixing unit centrosymmetric.

[0011] Furthermore, on each flat plate mixing unit, the feed channel is trapezoidal in cross-section parallel to the mixing unit, and the widths of the 4 feed channels gradually decrease along the flow direction, with the ends leading to the collision chamber. The size of this collision chamber (equal to the distance between two opposing feed channels) is at least greater than 5 times the width of the contraction end of the feed channel to form a jet and trigger the instability of the jet. The 4 feed channels have the same length and congruent shapes; the elliptical mixing chamber is elliptical in cross-section parallel to the mixing unit, connected to the collision oscillation chamber at one end along the major axis of the ellipse and to the discharge port at the other end. The 4 elliptical mixing chambers have the same size and congruent shapes. The width of the connection (entrance) between the mixing chamber and the collision oscillation chamber should also be at least greater than 5 times the width of the contraction end of the feed channel and is approximately elliptical as a whole to allow the oscillating fluid to fully develop. The end of the mixing chamber is a circular discharge port with the same radius as the feed port, facilitating the entry of the fluid into the next mixing unit.

[0012] In the method for fluid mixing in the passive continuous oscillating jet micro-mixer of the present invention, the fluid enters through the feed port of the first mixing unit, and jets are triggered through 4 cross-arranged contraction feed channels. Jet oscillation is triggered in the collision oscillation chamber. Then, the fluid enters 4 elliptical mixing chambers from the collision oscillation chamber and develops into vortex oscillation mixing, completing the passive continuous oscillating jet micro-mixing process in the first mixing unit; furthermore, the fluid enters the next mixing unit and subsequent mixing units from the discharge port of the first mixing unit, that is, the connection and superposition of multiple mixing units repeatedly trigger the jet oscillation process to achieve continuous oscillating mixing of the fluid; finally, the fluid flows out from the four discharge ports of the upper cover plate to complete the mixing process. The present invention can trigger passive continuous oscillation of the fluid without external energy input.

[0013] After the present invention adopts the above scheme, it has the following advantages:

[0014] 1. The present invention increases the flow velocity of the fluid after passing through the contraction feed channel, increases the local Reynolds number, and ejects in a relatively large-sized collision chamber to form a jet. Multiple jets converge and collide, increasing the turbulence intensity of the flow field.

[0015] 2. Four fluid streams meet in the central collision chamber of the unit through the feed channels, triggering the instability of the jet. After each fluid stream rushing out of the feed channel collides with the other 3 fluid streams, it alternately enters the elliptical mixing chambers on both sides, forming periodic oscillation. At this time, different fluids continuously interleave with each other, significantly increasing the contact area between the fluids. This effect improves with the increase in the oscillation frequency.

[0016] 3. The fluid enters the mixing chamber in the form of alternating vortices. Due to the elliptical structure of the mixer, the vortices further develop in the channel, driving the surrounding fluid to rotate, significantly increasing the fluid convection intensity, and promoting rapid mixing of the fluid.

[0017] 5. The mixer of the present invention has a simple structure, without complex structures such as baffles or channels with large curvature, effectively controls the pressure drop loss of the fluid, and has few dead zones.

[0018] 6. The mixing mechanism of the present invention is based on an instantaneous changing flow field. The oscillation direction of the jet and the rotation direction of the eddy current both change periodically with time, which can effectively reduce the dead zone range and occurrence probability.

[0019] 7. The mixer of the present invention can be conveniently coupled with multiple flat mixing units, and the jet oscillation process can be repeatedly triggered in multiple mixing units to improve the mixing efficiency.

[0020] 8. The oscillation frequency and mixing efficiency of the fluid in the mixer of the present invention increase as the overall size of the reactor decreases, meeting the trend of equipment miniaturization and the requirements of micro mixing. Description of the Drawings

[0021] Figure 1 is a three-dimensional structure diagram of the mixer of the present invention. Among them, 1-1 are 4 feed 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, and 1-6 are 4 final discharge ports;

[0022] Figure 2 is a top view of the mixing unit. Among them, 2-1 to 2-4 are contraction feed channels, 2-5 is the collision oscillation cavity, 2-6 to 2-9 are elliptical mixing cavities, and 2-10 to 2-13 are discharge ports;

[0023] Figure 3 is a side view of the mixing unit, where the meanings of the labels are the same as those in Figure 1 、 Figure 2 ;

[0024] Figure 4 is a schematic diagram of the periodic oscillating flow principle of the fluid in the mixing unit;

[0025] Figure 5 is a distribution diagram of the fluid mass fraction in the micro mixer in Example 1;

[0026] Figure 6 is a distribution diagram of the fluid mass fraction in the micro mixer in Example 2. Detailed Embodiments

[0027] The following non-limiting embodiments can enable those of ordinary skill in the art to more comprehensively understand the present invention, but do not limit the present invention in any way.

[0028] A passive continuous oscillating jet micro mixer is composed of multiple flat mixing units and an upper cover plate, as shown in Figure 1 、 2, as shown in FIGS. 3 (there is 1 mixing unit in Example 1 below and 3 mixing units in Example 2), all the flat plates have the same size and are closely 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, relative to the previous mixing unit, the channel structure rotates 45 degrees around the center of the collision oscillation cavity 2-5. The feed port 1-1 and the discharge ports 2-10 to 2-13 are cylindrical channels with equal radii. The fluid to be mixed enters the mixer from 4 feed ports 1-1 below the first mixing unit 1-2, passes through multiple mixing units 1-2 to 1-4, and after undergoing the enhanced mixing process triggered by jet oscillation in each mixing unit, finally flows out from 4 discharge ports 1-6 on the upper cover plate to complete the mixing.

[0029] Each mixing unit has the same channel structure, including 4 feed ports 1-1, 4 feed channels 2-1 to 2-4, 1 collision oscillation cavity 2-5, 4 elliptical mixing cavities 2-6 to 2-9, and 4 discharge ports 2-10 to 2-13. The 4 feed channels 2-1 to 2-4 are arranged in a cross shape, adjacent feed channels are perpendicular to each other, and the spaced feed channels are collinear, forming two pairs of fluid that collide face to face. The feed channels 2-1 to 2-4 are trapezoidal in cross-section parallel to the mixing unit, and the 4 feed channels 2-1 to 2-4 have the same length and congruent shapes. The feed channels 2-1 to 2-4 and the discharge channels converge to the collision oscillation cavity 2-5 at the center of the flat plate. The distance from the center of the collision oscillation cavity 2-5 to the front end of the feed channels 2-1 to 2-4 is equal to its distance to the ends of the elliptical mixing cavities 2-6 to 2-9, making the layout of the entire mixing unit centrosymmetric. The feed channels 2-1 to 2-4 are trapezoidal in cross-section parallel to the mixing unit. One end of the feed channels 2-1 to 2-4 is connected to the feed port 1-1, and the other end gradually contracts and is connected to the collision oscillation cavity 2-5. The widths of the 4 feed channels 2-1 to 2-4 gradually decrease along the flow direction, and the ends lead to the collision oscillation cavity 2-5. The elliptical mixing cavities 2-6 to 2-9 are elliptical in cross-section parallel to the mixing unit, and one end along the major axis of the ellipse is connected to the collision oscillation cavity 2-5, and the other end is connected to the discharge ports 2-10 to 2-13. The 4 elliptical mixing cavities 2-6 to 2-9 have the same size and congruent shapes. 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 contracted end of the feed channels 2-1 to 2-4 to form a jet and trigger the instability of the jet. The 4 elliptical mixing cavities 2-6 to 2-9 are sandwiched between every 2 feed channels 2-1 to 2-4, and the included angle with the adjacent feed channels 2-1 to 2-4 is 45 degrees. The width of the connection between the elliptical mixing cavity 2-6 to 2-9 and the collision oscillation cavity 2-5 should also be at least 5 times greater than the width of the contracted end of the feed channels 2-1 to 2-4. That is, relative to the previous mixing unit, the channel structure rotates 45 degrees around the center of the collision oscillation cavity.

[0030] For the method of fluid mixing in the above passive continuous oscillating jet micromixer, the fluid enters through the 4 initial feed ports 1-1 of the first mixing unit 1-2, and forms two pairs of fluid colliding face-to-face through the 4 cross-arranged feed channels 2-1 to 2-4, triggering a jet and injecting it into the collision oscillation cavity 2-5. After the interaction of jet oscillation is triggered in the collision oscillation cavity 2-5, the fluid is redistributed and enters the 4 elliptical mixing cavities 2-6 to 2-9 to develop into vortex oscillation mixing. After further mixing in the elliptical oscillation cavities 2-6 to 2-9, the fluid flows out through the discharge ports 2-10 to 2-13, completing the passive continuous oscillating jet micro-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 function of continuous oscillation enhanced mixing. Finally, the fluid flows out through the four final discharge ports 1-6 of the upper cover plate 1-5 to complete the mixing process.

[0031] For the mixing enhancement mechanism of the fluid in the mixing unit, see Figure 4 as shown. After passing through the contraction feed channels 2-1 to 2-4, the fluid forms a jet. The fluid collides and interacts in the collision oscillation cavity 2-5. Due to the instability of the jet, the fluid cannot maintain a steady flow, but forms a transient periodic oscillation. Taking an oscillation period T as an example, in the time period of 0 to 0.5T, the fluid ejected from the feed channels 2-1 to 2-4 deviates along its left side and enters the left elliptical mixing cavities 2-6 to 2-9, and a clockwise rotating vortex is formed at the center of the cavity. In the time period of 0.5 to 1T, the fluid ejected from the feed channels 2-1 to 2-4 changes to deviate along its right side and enters the right elliptical mixing cavities 2-6 to 2-9, and a counterclockwise rotating vortex is formed at the center of the cavity. This periodic oscillation characteristic enables the fluid flowing out of the adjacent feed channels 2-1 to 2-4 to alternately enter the middle elliptical mixing cavities 2-6 to 2-9, which will greatly increase the contact area between the two fluids and effectively improve the mixing efficiency. On the other hand, the fluid entering the elliptical mixing cavities 2-6 to 2-9 deviates along the elliptical wall surface under the action of centrifugal force and forms a vortex. The vortex continuously develops in the elliptical mixing cavities 2-6 to 2-9, playing a role of rotating and stirring the surrounding fluid, significantly increasing the convection intensity in the cavity. With the oscillation of the fluid in the collision oscillation cavity 2-5, the rotation direction of the vortex also alternates, and the instantaneous change of the flow field improves the mixing efficiency and reduces the occurrence probability of dead zones at the same time. The oscillation frequency of the fluid can be adjusted by changing the dimensions of the feed channels 2-1 to 2-4, the collision oscillation cavity 2-5, and the elliptical mixing cavities 2-6 to 2-9 of the mixing unit to achieve the optimal mixing efficiency.

[0032] Example 1

[0033] In this embodiment, the mixing performance of a passive oscillating micromixer composed of a single mixing unit is tested. The size of the flat unit is 12.5 mm × 12.5 mm × 1 mm. The channel depth of the mixing unit on the plate is 0.5 mm. The lengths of the 4 feed channels 2-1 to 2-4 are 3.5 mm. One end of the feed channels 2-1 to 2-4 is connected to the feed port 1-1, and the other end gradually shrinks to 0.2 mm. The size of the collision oscillation cavity 2-5 (i.e., the distance between the two opposite feed channels 2-1 to 2-4) is 1.5 mm. The 4 elliptical mixing cavities 2-6 to 2-9 are located between every two feed channels 2-1 to 2-4, and the included angle with the adjacent feed channels 2-1 to 2-4 is 45 degrees. The minor axis size of the elliptical mixing cavities 2-6 to 2-9 is 2.25 mm. The ends of the elliptical mixing cavities 2-6 to 2-9 are connected to the discharge ports 2-10 to 2-13, and the center distance of the discharge ports 2-10 to 2-13 from the center of the mixing unit is 4.25 mm. The feed port 1-1 and the discharge ports 2-10 to 2-13 are cylindrical, with a diameter of 0.5 mm and depths of 1 mm and 0.5 mm respectively.

[0034] The mixing effect of Example 1 is as Figure 5 shown. Fluid A (0.1 g / L aqueous solution of resazurin, with the solute mass fraction set to 1) enters through the left and right feed channels 2-1 and 2-3 of the first mixing unit 1-2, and fluid B (water, with a solute mass fraction of 0) enters through the upper and lower feed channels 2-2 and 2-4 of the first mixing unit 1-2. The average inlet flow rate is 0.1 m / 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.

[0035]

[0036] 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 represents complete mixing, and MI = 0 represents complete non-mixing.

[0037] The fluids oscillate 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 fluids, and its periodic evolution law coincides with the Figure 4 flow schematic diagram. The solute enters the elliptical mixing cavities 2-6 to 2-9 for mixing by alternately rotating with the periodically turning eddies. The average mixing factor at the outlet is measured to reach 0.78, achieving mixing enhancement.

[0038] Example 2

[0039] The microreactor of the selected example is the same as Figure 1As shown in the figure, it includes 3 flat plate mixing units (i.e., the first mixing unit 1-2, the second mixing unit 1-3, and the third mixing unit 1-4) and 1 upper cover plate 1-5. The sizes of the four flat plates are all 12.5 mm × 12.5 mm × 1 mm. The geometric structures and sizes on the mixing units are basically the same as those in Embodiment 1. The only difference is that the width at the interface between the ends of the feed channels 2-1 to 2-4 and the collision oscillation cavity 2-5 is reduced to 0.1 mm.

[0040] The mixing effect of Embodiment 2 is as Figure 6 shown in the figure. Fluid A (0.1 g / L resazurin aqueous solution, with the solute mass fraction set to 1) enters from the left and right feed channels 2-1 and 2-3 of the first mixing unit 1-2, and fluid B (water, with the solute mass fraction of 0) enters from the upper and lower feed channels 2-2 and 2-4 of the first mixing unit 1-2. The average inlet flow rate is 0.075 m / s, and the equivalent Reynolds number is 37.5. The fluids meet and mix in the collision oscillation cavity 2-5. 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). From the results in the figure, it can be obtained that the oscillation effect occurs in the fluid in each unit. Due to the reduction of the jet width, the oscillation frequency of the fluid increases to 48 Hz, and the mixing efficiency is significantly improved compared with Embodiment 1. Under the action of fluid oscillation and eddy current, the fluids are well mixed when leaving Unit 1 (the first mixing unit 1-2), and the mixing factor at the outlet is 0.9; the fluids are basically mixed when leaving Unit 2 (the second mixing unit 1-3), and 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 everywhere tend to be equal, and the outlet mixing factor is close to 1, achieving full mixing.

Claims

1. A passive continuous oscillating jet micro mixer, comprising a plurality of flat plate mixing units and an upper cover plate, characterized in that: Multiple flat-type mixing units and an upper cover plate are closely attached in sequence. Each mixing unit is successively composed of 4 shrinkage feeding channels arranged in a cross pattern, 1 collision oscillation cavity, and 4 elliptical mixing cavities; the open end of the feeding channel is connected to the feeding port, and the shrinkage end is connected to the collision oscillation cavity; one end of the elliptical mixing cavity is connected to the collision oscillation cavity, and the other end is connected to the discharging port. The feeding channel is trapezoidal in cross-section parallel to the mixing unit, and the width of the feeding channel gradually narrows along the axis. The lengths of the 4 feeding channels are the same and their shapes are congruent; the elliptical mixing cavity is elliptical in cross-section parallel to the mixing unit. One end along the major axis of the ellipse is connected to the collision oscillation cavity, and the other end is connected to the discharging port. The sizes of the 4 elliptical mixing cavities are the same and their shapes are congruent. The 4 feeding channels are arranged in a cross pattern, adjacent feeding channels are perpendicular to each other, and the separated feeding channels are collinear; the 4 elliptical mixing cavities are sandwiched between every two feeding channels, perpendicular to each other, and the included angle with the adjacent feeding channels is 45 degrees; the feeding channels and the elliptical mixing cavities converge at the collision oscillation cavity. The distance from the center of the collision oscillation cavity to the front end of the feeding channel is equal to the distance from it to the end of the elliptical mixing cavity. The entire structure of the mixing unit is centrosymmetric with the collision oscillation cavity as the center. The size of the collision mixing cavity, that is, the distance between two opposite feeding channels, is greater than 5 times the width of the shrinkage end of the feeding channel; the inlet width of the elliptical mixing cavity is greater than 5 times the width of the shrinkage end of the feeding channel.

2. The micromixer according to claim 1, characterized in that: Between multiple flat-type mixing units, the discharging port of the previous mixing unit is connected to the feeding port of the next mixing unit, that is, relative to the previous mixing unit, the channel structure rotates 45 degrees around the center of the collision oscillation cavity; multiple flat-type mixing units and an upper cover plate are connected in sequence, and the number of mixing units n ≥ 2.

3. A method for fluid mixing in the passive continuous oscillating jet micromixer according to any one of claims 1 to 2, characterized in that: the fluid Entering through the feeding port of the first mixing unit, jets are induced by the 4 shrinkage feeding channels arranged in a cross pattern, and jet oscillation is induced in the collision oscillation cavity. Subsequently, the fluid enters the 4 elliptical mixing cavities from the collision oscillation cavity and develops into vortex oscillation mixing, completing the passive continuous oscillation jet micro-mixing process in the first mixing unit; furthermore, the fluid enters the subsequent mixing units from the discharging port of the first mixing unit and undergoes the oscillation mixing process again, that is, the connection and superposition of multiple mixing units repeatedly induce the jet oscillation process to achieve continuous oscillation mixing of the fluid; finally, the fluid flows out from the four final discharging ports of the upper cover plate to complete the mixing process.

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