Low resistance passive high flux microreactor based on oscillatory flow

Abstract

The application discloses a low-resistance passive high-flux micro-reactor based on oscillating flow, wherein the oscillating cavity comprises a gradually wide cavity and a gradually narrow cavity, the narrower end of the gradually wide cavity is connected with a feeding channel, the end wall of the narrower end of the gradually wide cavity located at both sides of the feeding channel forms a conda ladder relative to the wall of the feeding channel, the wider end of the gradually wide cavity is connected with the wider end of the gradually narrow cavity, and the narrower end of the gradually narrow cavity is connected with a discharging channel; a flow divider divides the oscillating cavity into two sub-oscillating cavities, so that the fluid flowing along the wall in the oscillating cavity forms an internal circulation flow and vortex flow in the two sub-oscillating cavities; under the pushing of the internal circulation flow and the traction of the low-pressure area generated by the vortex flow, the fluid forms periodic oscillation in the oscillating cavity, and chaotic convection is induced. The application does not need additional external energy to promote mixing, has the advantages of maintenance-free, easy control and easy integration, and is suitable for efficient and safe reaction of a dangerous reaction system under the requirements of high flux and anti-clogging.

Description

Technical Field

[0001] The invention belongs to the technical field of microfluids, and in particular relates to a low-resistance passive high-throughput microreactor based on oscillating flow. Background Art

[0002] Chemical engineering, biomedicine, environment, energy and other fields often involve reactions between miscible and immiscible phases. -6 ~10 -3 It has the characteristics of small equipment size, high heat and mass transfer efficiency, short residence time, and inherent safety, which brings many advantages to industrial production that traditional reactors do not have. It has great application potential in material synthesis, solvent extraction, and hazardous chemical reactions. For industrial production, single-stage microreactors need to maintain low flow resistance and efficient mixing and mass transfer performance under high-throughput (usually ≥100mL / min) operating conditions. Ordered flow micromixers such as laminated flow and droplet flow (plug flow) need to maintain orderly and controllable flow, which leads to limited feed rates and can only operate under low-throughput (usually ≤10mL / min) conditions.

[0003] Chaotic convection microreactors use disordered flow and the intensity of chaotic convection increases with the increase of flux. They are suitable for efficient mass transfer under high flux and are gradually becoming an important breakthrough direction for building "desktop factories". Currently, common chaotic convection microreactors induce chaotic convection in the microreactor by embedding barriers, curved channels, merger-splitting structures, etc. to promote the contact between the two fluids and enhance the mass transfer process. However, due to the formation of high-energy consumption flow patterns such as collision flow and vortex or the complex microchannel structure of the above-mentioned microreactors, the internal flow resistance is too large, resulting in increased pumping energy consumption and difficulty in integration and amplification. Traditional oscillating feedback microreactors have a complex structure due to the presence of feedback channels and are easily clogged by dirt or particulate products. Therefore, for industrial production, there is a lack of a microreactor that can maintain low resistance and efficient mixing and mass transfer performance under high-throughput operation. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one objective of the present invention is to propose a low-resistance, passive, high-throughput microreactor based on oscillatory flow. This microreactor has a low risk of clogging failure, operates within a high-Reynolds number, high-throughput range while maintaining low pressure loss, requires no additional energy to promote mixing, and is maintenance-free, easy to operate, and easily integrated. It is suitable for efficient and safe reactions in radioactive spent fuel reprocessing, particle preparation, and flammable, explosive, toxic, and corrosive hazardous reaction systems that require high throughput and anti-clogging properties.

[0005] A low-resistance passive high-throughput microreactor based on oscillatory flow according to an embodiment of the present invention comprises:

[0006] An oscillation cavity, the oscillation cavity comprising a gradually widening cavity and a gradually narrowing cavity, the narrower end of the gradually widening cavity being connected to the feed channel, the narrower end walls of the gradually widening cavity located on both sides of the feed channel forming coanda steps relative to the side walls of the feed channel, the wider end of the gradually widening cavity being connected to the wider end of the gradually narrowing cavity, and the narrower end of the gradually narrowing cavity being connected to the discharge channel;

[0007] A flow divider is provided in the oscillation cavity and is located at the wider end of the gradually widening cavity and the wider end of the gradually narrowing cavity, dividing the oscillation cavity into two sub-oscillation cavities, and is used to enable the wall-attached flow fluid entering the oscillation cavity to form an internal circulation flow and an eddy current in the two sub-oscillation cavities. Under the pushing action of the internal circulation flow and the pulling action of the low-pressure zone generated by the eddy current, the fluid forms periodic oscillations in the oscillation cavity, thereby inducing chaotic convection.

[0008] The working principle of the low-resistance passive high-throughput microreactor based on oscillating flow in an embodiment of the present invention is specifically as follows: under high flux, when multiple reactant fluids, such as two reactant fluids, are rapidly injected into the oscillating chamber through the feed channel, they are divided into two fluid streams by the splitter. The high-speed jet will produce an entrainment effect on the surrounding fluid, thereby forming a low-pressure zone near the Coanda steps on both sides. The high-speed fluid layer is attracted by the low-pressure zone and flows along one side wall of the oscillating chamber, forming a wall-attached flow. For example, the high-speed fluid layer is attracted by the low-pressure zone and flows along the left wall of the oscillating chamber, forming a wall-attached flow. The fluid is blocked by the wall of the narrowing chamber downstream of the left sub-oscillating chamber (such as the curved wall on the left side of the wider end of the narrowing chamber) and the flow rate is reduced. According to the Bernoulli equation, the downstream pressure is greater than the upstream pressure. Therefore, a pressure difference is formed between the upstream and downstream of the left sub-oscillating chamber. Under the action of the pressure difference, the fluid forms an internal circulation flow, which generates a lateral driving force on the high-speed fluid at the inlet of the oscillating chamber. At the same time, the low-pressure zone formed in the right sub-oscillating chamber due to the presence of vortexes pulls the fluid toward the right sub-oscillating chamber. Driven by the lateral force of the inner circulation flow of the left sub-oscillation chamber and pulled by the low-pressure zone of the right sub-oscillation chamber, the high-speed fluid swings toward the right sub-oscillation chamber, eventually forming a new wall-attached flow in the right sub-oscillation chamber. This new wall-attached flow also swings toward the left sub-oscillation chamber under the combined action of the inner circulation flow of the right sub-oscillation chamber and the low-pressure zone of the right sub-oscillation chamber, thus forming a periodic oscillation cycle. The oscillating flow, inner circulation flow, and eddy currents generated within the oscillation chamber all have secondary convection flows perpendicular to the main flow direction, inducing the generation of chaotic convection. Chaotic convection ensures efficient mixing of multiple reactant fluids through the rotation, stretching, and folding of the convection fluid, thereby achieving rapid mixing and mass transfer at high throughput.

[0009] The low-resistance passive high-throughput microreactor based on oscillating flow in the embodiment of the present invention has the following advantages: (1) the microreactor structure is simplified, the feedback channel of the traditional oscillating feedback microreactor is eliminated, and the risk of failure of the microreactor due to clogging by dirt and particulate products is reduced; (2) it can be used at high Reynolds numbers (usually ≥10 2 ) in the high flux range while maintaining low pressure loss (typically ≤10 1 kPa). Under the same flux, it is much lower than other types of chaotic convection microreactors; (3) It can overcome the influence of high flux and short residence time, and complete the efficient mixing and mass transfer of reactants within the residence time of milliseconds; (4) It is easy to greatly improve the processing flux and match the production capacity of industrial production through quantitative and size-selective amplification; (5) There are no mechanical moving parts and no need for additional external energy to promote mixing, which has the advantages of maintenance-free, easy to operate and easy to integrate; (6) It is suitable for the efficient and safe reaction of radioactive spent fuel reprocessing, particle preparation, flammable, explosive, toxic and corrosive hazardous reaction systems under high flux and anti-clogging requirements; it is suitable for fine chemical industry, material synthesis, environmental governance, energy and other fields.

[0010] In some embodiments, the walls on opposite sides of the oscillation cavity are in a streamline shape.

[0011] In some embodiments, projections of the walls on opposite sides of the oscillation cavity in the depth direction of the oscillation cavity include straight line segments and curved line segments.

[0012] In some embodiments, the flow divider includes two opposite first walls and two opposite second walls, wherein the first walls on the two opposite sides are respectively opposite to the two side walls of the gradually widening end of the gradually widening cavity and are parallel or approximately parallel to each other, and the second walls on the two opposite sides are respectively opposite to the two side walls of the gradually widening end of the gradually narrowing cavity and are parallel or approximately parallel to each other.

[0013] In some embodiments, on the same side of the flow divider, the distance between the first wall and the wall of the gradually widening cavity is greater than the distance between the second wall and the wall of the gradually narrowing cavity.

[0014] In some embodiments, the characteristic depth of the oscillation cavity is on the order of 10 -3 ~10 0 mm, the characteristic width of the feed channel and the characteristic width of the discharge channel are on the order of 10 -3 ~10 0 mm.

[0015] In some embodiments, the characteristic depth of the oscillation cavity is consistent with the characteristic depth of the feed channel, and the characteristic width of the feed channel is consistent with the characteristic width of the discharge channel.

[0016] In some embodiments, the feed channel includes a main feed channel and multiple branch feed channels, each of which has a reactant inlet at one end, and the other end of each of the branch feed channels is connected to the main feed channel, and the main feed channel is connected to the narrower end of the gradually widening cavity.

[0017] In some embodiments, the oscillation cavity and the flow divider constitute an oscillator, and the oscillator is symmetrical or asymmetrical.

[0018] In some embodiments, there are one or more oscillators, wherein a plurality of the oscillators are connected in series or in parallel between the feed channel and the discharge channel.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 Schematic diagram of the planar structure of a low-resistance passive high-throughput microreactor based on oscillating flow according to an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the working principle of a low-resistance passive high-throughput microreactor based on oscillating flow according to an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the specific structure of a low-resistance passive high-throughput microreactor based on oscillating flow according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of an application scenario of a low-resistance passive high-throughput microreactor based on oscillating flow according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Low-resistance passive high-throughput microreactor 1000 based on oscillatory flow; oscillation chamber 1; gradually widening chamber 101; Coanda steps 1011; gradually narrowing chamber 102; sub-oscillation chamber 103; flow divider 2; first wall 201; second wall 202; feed channel 3; feed branch channel 301; reactant inlet 3011; feed main channel 302; discharge channel 4; upstream pressure P A ; Downstream pressure P B ; lateral driving force C; internal circulation flow D; vortex E. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] The following combination Figures 1 to 4 The low-resistance passive high-throughput microreactor 1000 based on oscillatory flow according to an embodiment of the present invention is described.

[0029] like Figures 1 to 4 As shown, a low-resistance passive high-throughput microreactor 1000 based on oscillating flow according to an embodiment of the present invention includes an oscillating chamber 1 and a flow divider 2 .

[0030] Among them, the oscillation cavity 1 includes a gradually widening cavity 101 and a gradually narrowing cavity 102; the narrower end of the gradually widening cavity 101 is connected to the feed channel 3, and the narrower end wall surfaces of the gradually widening cavity 101 located on both sides of the feed channel 3 form Coanda steps 1011 (also called Coanda steps) relative to the two side walls of the feed channel 3. The Coanda steps 1011 are conducive to the fluid entering the oscillation cavity 1 to produce the Coanda effect to form a wall-attached fluid. The wider end of the gradually widening cavity 101 is connected to the wider end of the gradually narrowing cavity 102, and the narrower end of the gradually narrowing cavity 102 is connected to the discharge channel 4.

[0031] The flow divider 2 is arranged in the oscillation cavity 1 and is located at the wider end of the gradually widening cavity 101 and the wider end of the gradually narrowing cavity 102, dividing the oscillation cavity 1 into two sub-oscillation cavities 103, which is used to make the fluid flowing along the wall entering the oscillation cavity 1 form an internal circulation flow D and an eddy current E in the two sub-oscillation cavities 103. Under the pushing action of the internal circulation flow D and the traction action of the low-pressure zone generated by the eddy current E, the fluid forms periodic oscillations between the two sub-oscillation cavities 103 in the oscillation cavity 1, inducing chaotic convection, thereby achieving efficient mass transfer.

[0032] The working principle of the low resistance passive high flux microreactor 1000 based on oscillating flow according to the embodiment of the present invention is as follows: Figure 2 As shown, under high flux, when multiple reactant fluids, for example two reactant fluids, are rapidly injected into the oscillation chamber 1 through the feed channel 3, they are split into two fluid streams by the splitter 2. The high-speed jet will produce an entrainment effect on the surrounding fluid, thereby forming a low-pressure area near the Coanda steps 1011 on both sides. The high-speed fluid layer is attracted by the low-pressure area and flows along one side wall of the oscillation chamber 1, forming a wall-attached flow, for example, Figure 2 As shown in the left figure, the high-speed fluid forms a wall-attached flow along the left wall of the oscillation cavity 1. The fluid is affected by the left wall of the wider end of the gradually narrowing cavity 102 (as shown in the figure below). Figure 2The left side arc wall of the gradually narrowing cavity 102 blocks the flow velocity and reduces the downstream pressure P according to the Bernoulli equation. B Greater than upstream pressure P A Therefore, a pressure difference is formed between the upstream and downstream of the left sub-oscillation cavity 103. Under the action of the pressure difference, the fluid forms an internal circulation flow D, which generates a lateral driving force C on the high-speed fluid at the entrance of the oscillation cavity 1. At the same time, the sub-oscillation cavity 103 on the right forms a low-pressure area P due to the existence of the vortex E. C The fluid is pulled to move toward the right sub-oscillation cavity 103. Under the driving effect of the lateral driving force C of the internal circulation flow D of the left sub-oscillation cavity 103 and the pulling effect of the low-pressure area of ​​the right sub-oscillation cavity 103, the high-speed fluid swings toward the right sub-oscillation cavity 103, and finally forms a new wall-attached flow in the right sub-oscillation cavity 103, as shown in FIG. Figure 2 As shown in the right figure, the new wall-attached flow will also swing toward the left sub-oscillation cavity 103 under the combined action of the internal circulation flow D of the right sub-oscillation cavity 103 and the low-pressure area of ​​the right sub-oscillation cavity 103, thus forming a periodic oscillation over and over again. The oscillating flow, internal circulation flow D, and vortex E generated in the oscillation cavity 1 all have secondary convection flows perpendicular to the main flow direction, thereby inducing the generation of chaotic convection. Chaotic convection ensures the efficient mixing of multiple reactant fluids through the rotation, stretching, and folding of the convection fluid, thereby achieving rapid mixing and mass transfer at high throughput.

[0033] The low-resistance passive high-throughput microreactor 1000 based on oscillating flow according to the embodiment of the present invention has the following advantages: (1) the microreactor structure is simplified, the feedback channel of the traditional oscillating feedback microreactor is eliminated, and the risk of failure of the microreactor due to clogging by dirt and particulate products is reduced; (2) the microreactor can be operated at a high Reynolds number (usually ≥10 2 ) in the high flux range while maintaining low pressure loss (typically ≤10 1 kPa). Under the same flux, it is much lower than other types of chaotic convection microreactors; (3) It can overcome the influence of high flux and short residence time, and complete the efficient mixing and mass transfer of reactants within the residence time of milliseconds; (4) It is easy to greatly improve the processing flux and match the production capacity of industrial production through quantitative and size-selective amplification; (5) There are no mechanical moving parts and no need for additional external energy to promote mixing, which has the advantages of maintenance-free, easy to operate and easy to integrate; (6) It is suitable for the efficient and safe reaction of radioactive spent fuel reprocessing, particle preparation, flammable, explosive, toxic and corrosive hazardous reaction systems under high flux and anti-clogging requirements; it is suitable for fine chemical industry, material synthesis, environmental governance, energy and other fields.

[0034] In some embodiments, the walls on opposite sides of the oscillation cavity 1 (i.e. Figure 1The left and right walls in the oscillation chamber (the left and right walls) are streamlined. This streamlined shape refers to the shape of the opposing walls of the oscillation chamber 1, as projected in the depth direction, that aligns with the shape of the fluid flowing along the wall. When the opposing walls of the oscillation chamber 1 are streamlined, the resistance to the fluid flowing along the wall is reduced.

[0035] In some embodiments, the projections of the walls on opposite sides of the oscillation cavity 1 in the depth direction of the oscillation cavity 1 include straight segments and curved segments. That is, the streamlined walls on opposite sides of the oscillation cavity 1 can be designed by straight segments and curved segments.

[0036] In some embodiments, the flow divider 2 includes two opposing first walls 201 and two opposing second walls 202. The two opposing first walls 201 are directly opposite the two walls of the widening end of the gradually widening cavity 101 and are parallel or approximately parallel to each other. The two opposing second walls 202 are directly opposite the two walls of the widening end of the gradually narrowing cavity 102 and are parallel or approximately parallel to each other. This reduces fluid resistance.

[0037] In some embodiments, on the same side of the flow divider 2, the distance between the first wall 201 and the wall of the gradually widening cavity 101 is greater than the distance between the second wall 202 and the wall of the gradually narrowing cavity 102. The area between the first wall 201 and the wall of the gradually widening cavity 101 is the main body of the sub-oscillation cavity 103, where the internal circulation flow D and eddy current E primarily occur. A larger space is required to allow the fluid to change its flow direction in the main body of the sub-oscillation cavity 103. The area between the second wall 202 and the wall of the gradually narrowing cavity 102 is the passage for the fluid to enter the discharge channel 4 from the main body of the sub-oscillation cavity 103. The smaller distance between the second wall 202 and the wall of the gradually narrowing cavity 102 prevents most of the fluid 2 from directly flowing out of the main body of the sub-oscillation cavity 103 through this passage. This results in insufficient fluid in the main body of the sub-oscillation cavity 103 to form sufficiently strong internal circulation flow D and eddy current E, thereby preventing oscillatory flow.

[0038] In some embodiments, the characteristic depth of the oscillation cavity 1 is on the order of 10 -3 ~10 0 mm, the characteristic width of the feed channel 3 and the characteristic width of the discharge channel 4 are of the order of 10 -3 ~10 0 mm. In this way, the size design requirements of the microreactor can be met.

[0039] In some embodiments, the characteristic depth of the oscillation cavity 1 is consistent with the characteristic depth of the feed channel 3, and the characteristic width of the feed channel 3 is consistent with the characteristic width of the discharge channel 4, which is beneficial to improving the mixing performance and efficiency of various reactant fluids.

[0040] In some embodiments, the feed channel 3 includes a main feed channel 302 and multiple branch feed channels 301. One end of each of the multiple branch feed channels 301 is provided with a reactant inlet 3011, and the other ends of the multiple branch feed channels 301 are connected to the main feed channel 302. The main feed channel 302 is connected to the narrower end of the gradually widening cavity 101. In actual use, multiple reaction fluids can be input one by one from the reactant inlets 3011 of the multiple branch feed channels 301, and the multiple reactant fluids are injected into the oscillation cavity 1 through the main feed channel 302; or multiple reactant fluids can be pre-mixed and input from the reactant inlet 3011 of one of the branch feed channels 301, and injected into the oscillation cavity 1 through the main feed channel 302.

[0041] In some embodiments, the upstream end of the flow dividing body 2 is opposite to the outlet end of the feed channel 3 , and the downstream end of the separation body is opposite to the inlet end of the discharge channel 4 .

[0042] In some embodiments, the oscillating cavity 1 and the sub-flow body 2 constitute an oscillator, which may be symmetrical or asymmetrical. Symmetrical oscillators are suitable for oscillatory mixing of miscible fluids, ensuring that the average pressures of the two sub-oscillating cavities 103 are similar, so that the fluid oscillation position remains at the center of the oscillating cavity 1. Asymmetric oscillators are suitable for non-miscible fluids. Due to the asymmetric structure of the two sides, pressure compensation can be performed on the low-density fluid side to keep the fluid oscillation position at the center of the mixing cavity.

[0043] In some embodiments, there are one or more oscillators, wherein multiple oscillators are connected in series (e.g. Figure 4 As shown in the figure, or in parallel between the feed channel 3 and the discharge channel 4. Multiple oscillators connected in series can enhance mixing performance and improve mixing and mass transfer effects. Multiple oscillators connected in parallel can increase throughput and improve mixing and mass transfer efficiency.

[0044] The following describes a specific example of a low-resistance passive high-throughput microreactor 1000 based on oscillating flow according to an embodiment of the present invention.

[0045] like Figure 3 As shown, the characteristic width of the feed channel 3 and the discharge channel 4 is 200 microns, the length of the oscillation chamber 1 (i.e., the distance from the narrower end of the gradually widening chamber 101 to the narrower end of the gradually narrowing chamber 102) is 4.39 mm, the splitter is a diamond shape, the distance between the upstream end of the splitter and the narrower end of the gradually widening chamber 101 is 1.2 mm, the upstream end angle of the splitter 2 is 20°, and the upstream end angle of the splitter 2 is 50°. The depth of all channels in the microreactor is 1 mm, and the material is organic glass PMMA. Figure 4As shown, a low-resistance passive high-throughput microreactor 1000 based on oscillating flow was used for the extraction reaction of a 3 mol / L nitric acid solution. To increase the residence time of the microreactor, three oscillators were connected in series to form the extraction microreactor. The aqueous phase consisted of a 3 mol / L nitric acid solution, and the organic phase consisted of 30 vol% TBP kerosene. Syringe pumps were used to introduce the aqueous and organic phases into the low-resistance passive high-throughput microreactor 1000 based on oscillating flow at a single-phase flow rate of 30 mL / min. The two-phase reactant fluids rushed into the oscillator at high speed. Under the action of shear force, the aqueous phase was dispersed into a large number of fine droplets, greatly increasing the contact area between the two phases and significantly enhancing the mass transfer rate. The two-phase emulsion was received at the outlet of discharge channel 4. After centrifugation and phase separation, sample analysis showed that the extraction efficiency of 30 vol% TBP kerosene for nitric acid reached 90%, close to extraction equilibrium.

[0046] The experimental results of the above embodiments show that the low-resistance passive high-throughput microreactor 1000 based on oscillating flow according to the embodiment of the present invention can efficiently realize the nitric acid extraction reaction at high throughput.

[0047] It can be seen that the low-resistance passive high-throughput microreactor 1000 based on oscillating flow in the embodiment of the present invention utilizes the Coanda effect to generate wall-attached flow in the oscillation chamber 1, thereby forming an internal circulation flow D and an eddy current E in the two sub-oscillation chambers 103. Under the pushing action of the internal circulation flow D and the pulling action of the low-pressure zone generated by the eddy current E, the fluid forms periodic oscillations in the oscillation chamber 1, inducing chaotic convection and thus achieving efficient mass transfer; the low-resistance passive high-throughput microreactor 1000 based on oscillating flow in the embodiment of the present invention simplifies the structural design of the oscillating flow microreactor, eliminates the feedback channel, and thus reduces the risk of internal blockage of the microreactor; the low-resistance passive high-throughput microreactor 1000 based on oscillating flow in the embodiment of the present invention achieves efficient mass transfer with low flow resistance at high flux; the low-resistance passive high-throughput microreactor 1000 based on oscillating flow in the embodiment is suitable for efficient and safe reactions in dangerous reaction systems such as spent fuel reprocessing, particle preparation, and flammable and explosive reactions under high flux and anti-blocking requirements; and is suitable for fields such as fine chemicals, material synthesis, environmental governance, and energy.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A low-resistance passive high-throughput microreactor based on oscillating flow, characterized in that: include: An oscillation cavity, the oscillation cavity comprising a gradually widening cavity and a gradually narrowing cavity, the narrower end of the gradually widening cavity being connected to the feed channel, the narrower end walls of the gradually widening cavity located on both sides of the feed channel forming coanda steps relative to the side walls of the feed channel, the wider end of the gradually widening cavity being connected to the wider end of the gradually narrowing cavity, and the narrower end of the gradually narrowing cavity being connected to the discharge channel; a fluid distributor disposed in the oscillation cavity and located at the wider end of the gradually widening cavity and the wider end of the gradually narrowing cavity, dividing the oscillation cavity into two sub-oscillation cavities, and configured to cause the wall-attached fluid entering the oscillation cavity to form an internal circulation flow and eddy currents in the two sub-oscillation cavities. Under the pushing action of the internal circulation flow and the pulling action of the low-pressure zone generated by the eddy current, the fluid forms periodic oscillations in the oscillation cavity, thereby inducing chaotic convection; The walls on opposite sides of the oscillation cavity are in a streamline shape; The flow divider includes two opposite first walls and two opposite second walls, wherein the first walls are respectively opposite to and parallel to the two side walls of the gradually widening end of the gradually widening cavity, and the second walls are respectively opposite to and parallel to the two side walls of the gradually widening end of the gradually narrowing cavity. On the same side of the flow divider, the distance between the first wall surface and the wall surface of the gradually widening cavity is greater than the distance between the second wall surface and the wall surface of the gradually narrowing cavity.

2. The low-resistance passive high-throughput microreactor based on oscillatory flow according to claim 1, characterized in that: Projections of the wall surfaces on opposite sides of the oscillation cavity in the depth direction of the oscillation cavity include straight line segments and curved line segments.

3. The low-resistance passive high-throughput microreactor based on oscillatory flow according to claim 1, characterized in that: The characteristic depth of the oscillation cavity is on the order of 10 -3 ~10 0 mm, the characteristic width of the feed channel and the characteristic width of the discharge channel are on the order of 10 -3 ~10 0 mm.

4. The low-resistance passive high-throughput microreactor based on oscillatory flow according to claim 1, characterized in that: The characteristic depth of the oscillation cavity is consistent with the characteristic depth of the feed channel, and the characteristic width of the feed channel is consistent with the characteristic width of the discharge channel.

5. The low-resistance passive high-throughput microreactor based on oscillatory flow according to claim 1, characterized in that: The feed channel includes a main feed channel and multiple branch feed channels, each of which has a reactant inlet at one end and the other end of each branch feed channel connected to the main feed channel, which is connected to the narrower end of the gradually widening cavity.

6. The low-resistance passive high-throughput microreactor based on oscillatory flow according to any one of claims 1 to 5, characterized in that: The oscillation cavity and the flow divider constitute an oscillator, and the oscillator is symmetrical or asymmetrical.

7. The low-resistance passive high-throughput microreactor based on oscillatory flow according to claim 6, characterized in that: There are one or more oscillators, wherein a plurality of the oscillators are connected in series or in parallel between the feed channel and the discharge channel.

Images