Low-resistance passive high-flux microreactor based on oscillatory flow

Abstract

According to the low-resistance passive high-flux microreactor based on the oscillatory flow, an oscillation cavity comprises a gradually-broadened cavity and a gradually-narrowed cavity, the narrower end of the gradually-broadened cavity is connected with a feeding channel, the end wall faces of the narrower ends of the gradually-broadened cavity located on the two sides of the feeding channel respectively form coanda steps relative to the two side wall faces of the feeding channel, and the coanda steps are connected with the two side wall faces of the feeding channel. The wider end of the gradually-broadened cavity is connected with the wider end of the gradually-narrowed cavity, and the narrower end of the gradually-narrowed cavity is connected with the discharging channel; the flow dividing body divides the oscillation cavity into two sub oscillation cavities and is used for enabling fluid which enters the oscillation cavity and flows in a wall-attached mode to form internal circulation flow and vortex in the two sub oscillation cavities, and under the pushing effect of the internal circulation flow and the traction effect of a low-pressure area generated by the vortex, the fluid forms periodic oscillation in the oscillation cavity, and chaos convection is induced. The device does not need additional energy to promote mixing, has the advantages of being free of maintenance, easy to operate and control and easy to integrate, and is suitable for efficient and safe reaction of a dangerous reaction system under the requirements of high flux and blockage prevention.

Description

Technical Field

[0001] The invention belongs to the field of microfluid technology, 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, inherent safety, etc., 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 laminar flow and droplet flow (plug flow) need to maintain orderly and controllable flow, which limits their feed rate 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 have gradually become an important breakthrough direction for building "desktop factories". At present, common chaotic convection microreactors induce chaotic convection in microreactors by embedding barriers, curved channels, and coalescence-splitting structures to promote the contact between two fluids and enhance the mass transfer process. However, due to the formation of high-energy consumption flow types such as collision flow and vortex or the complex microchannel structure, the internal flow resistance of the above-mentioned microreactors is too large, resulting in increased pumping energy consumption and difficulty in integration and amplification. Traditional oscillating feedback microreactors have complex structures and are easily blocked by dirt or particulate products due to the existence of feedback channels. 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 solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a low-resistance passive high-throughput microreactor based on oscillating flow, which has a low risk of blockage failure, operates in a high-throughput range with a high Reynolds number while maintaining a low pressure loss, does not require additional external energy to promote mixing, has the advantages of maintenance-free, easy to operate, and easy to integrate, and is suitable for high-throughput and anti-blockage requirements for radioactive spent fuel reprocessing, particle preparation, and efficient and safe reactions in flammable, explosive, toxic and corrosive hazardous reaction systems.

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

[0006] An oscillation cavity, wherein the oscillation cavity comprises a gradually widening cavity and a gradually narrowing cavity, the narrower end of the gradually widening cavity is connected to a feed channel, the end walls of the narrower end of the gradually widening cavity located on both sides of the feed channel respectively form Coanda steps relative to the two side walls of the feed channel, the wider end of the gradually widening cavity is connected to the wider end of the gradually narrowing cavity, and the narrower end of the gradually narrowing cavity is connected to a discharge channel;

[0007] A fluid distributor is arranged 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 make the wall-attached flow fluid entering the oscillation cavity 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 area 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 the 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 oscillation chamber through the feed channel together, they are divided into two fluids by the split fluid, and the high-speed jet will produce a suction effect on the surrounding fluid, thereby forming a low-pressure area near the Coanda steps 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, forming a wall-attached flow. For example, the high-speed fluid layer is attracted by the low-pressure area and flows along the left side wall of the oscillation chamber, forming a wall-attached flow. The fluid is blocked by the wall of the narrowing chamber (such as the arc-shaped wall on the left side of the wider end of the narrowing chamber) downstream of the left sub-oscillation chamber, and the flow rate is reduced. According to the Bernoulli equation, the downstream pressure is greater than the upstream pressure, so a pressure difference is formed between the upstream and downstream of the left sub-oscillation chamber, and the fluid forms an internal circulation flow under the action of the pressure difference, and generates a lateral driving force on the high-speed fluid at the entrance of the oscillation chamber; at the same time, the sub-oscillation chamber on the right forms a low-pressure area due to the presence of vortices, which pulls the fluid to move to the right sub-oscillation chamber. The high-speed fluid swings toward the right sub-oscillation cavity under the lateral driving force of the inner circulation flow of the left sub-oscillation cavity and the traction of the low-pressure zone of the right sub-oscillation cavity, and finally forms a new wall-attached flow in the right sub-oscillation cavity. The new wall-attached flow will also swing toward the left sub-oscillation cavity under the joint action of the inner circulation flow of the right sub-oscillation cavity and the low-pressure zone of the right sub-oscillation cavity, thus forming a periodic oscillation over and over again. The oscillating flow, inner circulation flow and vortex generated in the oscillation cavity all have secondary convection flow perpendicular to the mainstream direction, thereby inducing the generation of chaotic convection. Chaotic convection ensures that multiple reactant fluids are efficiently mixed 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 a high Reynolds number (usually ≥10 2 ) while maintaining low pressure loss (usually ≤10 1 kPa). At 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 additional energy is required to promote mixing. It has the advantages of maintenance-free, easy to operate and easy to integrate; (6) It is suitable for radioactive spent fuel reprocessing, particle preparation, flammable, explosive, toxic and corrosive dangerous reaction systems with high flux and anti-clogging requirements. Efficient and safe reaction; Applicable to fine chemicals, material synthesis, environmental governance, energy and other fields.

[0010] In some embodiments, the wall surfaces 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 first walls on two opposite sides and second walls on two opposite sides, wherein the first walls on 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 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 of 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 feed branch channels, each of which has a reactant inlet at one end and the other end of each of which 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 given in part in the following description and in part will be obvious from the following description, or will be learned through 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 easily understood from the description of the embodiments in conjunction with the following 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 This is a working principle diagram 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 oscillating flow; oscillation chamber 1; gradually widened chamber 101; Coanda step 1011; gradually narrowed chamber 102; sub-oscillation chamber 103; split flow 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] Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] Combine the following Figures 1 to 4 The low-resistance passive high-throughput microreactor 1000 based on oscillating 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 comprises 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, respectively. The Coanda steps 1011 are beneficial 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 chamber 1 and is located at the wider end of the gradually widening chamber 101 and the wider end of the gradually narrowing chamber 102, dividing the oscillation chamber 1 into two sub-oscillation chambers 103, so as to make the wall-attached fluid entering the oscillation chamber 1 form 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 between the two sub-oscillation chambers 103 in the oscillation chamber 1, inducing chaotic convection, thereby realizing efficient mass transfer.

[0032] The working principle of the low-resistance passive high-throughput microreactor 1000 based on oscillating flow in 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 divided into two fluids by the splitter 2. The high-speed jet will produce a suction 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 (such as Figure 2The left curved wall of the gradually narrowing cavity 102 blocks the flow velocity. According to the Bernoulli equation, the downstream pressure P B Greater than the upstream pressure P A Therefore, a pressure difference is formed between the upstream and downstream of the sub-oscillation cavity 103 on the left, and the fluid forms an internal circulation flow D under the action of the pressure difference, generating 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. The high-speed fluid swings toward the right sub-oscillation cavity 103 under the driving effect of the lateral driving force C of the inner 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, 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 sub-oscillation cavity 103 on the left under the combined action of the inner circulation flow D of the sub-oscillation cavity 103 on the right and the low-pressure area of ​​the sub-oscillation cavity 103 on the right, thus forming periodic oscillations over and over again. The oscillating flow, inner circulation flow D and vortex E generated in the oscillation cavity 1 all have secondary convection flows perpendicular to the mainstream direction, thereby inducing the generation of chaotic convection. Chaotic convection ensures that multiple reactant fluids are efficiently mixed 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) it can be used at a high Reynolds number (usually ≥10 2 ) while maintaining low pressure loss (usually ≤10 1 kPa). At 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 additional energy is required to promote mixing. It has the advantages of maintenance-free, easy to operate and easy to integrate; (6) It is suitable for radioactive spent fuel reprocessing, particle preparation, flammable, explosive, toxic and corrosive dangerous reaction systems with high flux and anti-clogging requirements. Efficient and safe reaction; Applicable to fine chemicals, material synthesis, environmental governance, energy and other fields.

[0034] In some embodiments, the walls of the oscillation cavity 1 on opposite sides (i.e. Figure 1The left and right walls of the oscillation cavity 1 are in a streamline shape. Here, the streamline shape means that the shapes of the two opposite walls of the oscillation cavity 1 in the depth projection direction are consistent with the shape of the fluid flowing along the wall. When the walls of the two opposite sides of the oscillation cavity 1 are in a streamline shape, the resistance of the fluid flowing along the wall is small.

[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 line segments and curved line segments. That is, the walls on opposite sides of the oscillation cavity 1 in the shape of a streamline can be designed by straight line segments and curved line segments.

[0036] In some embodiments, the flow divider 2 includes two opposite first walls 201 and two opposite second walls 202, the two opposite first walls 201 are respectively opposite to the two side walls of the gradually widening end of the gradually widening cavity 101 and are parallel or approximately parallel to each other, and the two opposite second walls 202 are respectively opposite to the two side walls of the gradually widening end of the gradually narrowing cavity 102 and are parallel or approximately parallel to each other. In this way, the fluid resistance is small.

[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 widened cavity 101 is greater than the distance between the second wall 202 and the wall of the gradually narrowed cavity 102. Among them, the area between the first wall 201 and the wall of the gradually widened cavity 101 is the main part of the sub-oscillation cavity 103, which is the main place where the internal circulation flow D and the vortex E occur, and a larger space is required for the fluid to achieve the change of flow direction in the main part of the sub-oscillation cavity 103; the area between the second wall 202 and the wall of the gradually narrowed cavity 102 is the passage for the fluid to enter the discharge channel 4 from the main part of the sub-oscillation cavity 103. The smaller distance between the second wall 202 and the wall of the gradually narrowed cavity 102 prevents most of the fluid 2 from directly flowing out of the main part of the sub-oscillation cavity 103 through the passage, resulting in insufficient fluid in the main part of the sub-oscillation cavity 103 to form sufficiently strong internal circulation flow D and vortex E, thereby failing to achieve oscillating 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 a plurality of feed branch channels 301, one end of each of the plurality of feed branch channels 301 is provided with a reactant inlet 3011, and the other end of each of the plurality of feed branch channels 301 is connected to the main feed channel 302, and the main feed channel 302 is connected to the narrower end of the gradually widened cavity 101. In actual use, a plurality of reactant fluids can be inputted from the reactant inlets 3011 of the plurality of feed branch channels 301 one by one, and the plurality of reactant fluids are injected into the oscillation cavity 1 through the main feed channel 302; or a plurality of reactant fluids can be pre-mixed, inputted from the reactant inlet 3011 of one of the feed branch 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 separator 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-fluid 2 constitute an oscillator, and the oscillator is symmetrical or asymmetrical. Among them, the oscillator with a symmetrical structure is suitable for the oscillation mixing of miscible fluids, ensuring that the average pressures of the two sub-oscillating cavities 103 are similar, so that the position of the fluid oscillation is maintained at the center of the oscillation cavity 1; the oscillator with an asymmetric structure is suitable for immiscible fluids. Due to the asymmetric structure on both sides, pressure compensation can be performed on one side of the low-density fluid to keep the position of the fluid oscillation 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) or in parallel between the feed channel 3 and the discharge channel 4. Multiple oscillators connected in series can enhance the mixing performance and improve the mixing and mass transfer effects. Multiple oscillators connected in parallel can increase the flux and improve the mixing and mass transfer efficiency.

[0044] The following is a description of 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°, the upstream end angle of the splitter 2 is 50°, the depth of all channels of 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 is used for the extraction reaction of 3 mol / L nitric acid solution. In order to increase the residence time of the microreactor, a three-stage oscillator is connected in series to form an extraction microreactor. The aqueous phase is a 3 mol / L nitric acid solution, and the organic phase is 30 vol%-TBP kerosene. The aqueous phase and the organic phase are respectively introduced into the low-resistance passive high-throughput microreactor 1000 based on oscillating flow by a syringe pump at a single-phase flux of 30 mL / min. The two-phase reactant fluid rushes into the oscillator at a high speed, and the aqueous phase is dispersed into a large number of fine droplets under the action of shear force, which greatly increases the contact area of ​​the two phases and significantly enhances the mass transfer rate. The two-phase emulsion is received at the outlet of the discharge channel 4, and the sample analysis after centrifugal separation shows that the extraction efficiency of 30 vol% TBP-kerosene for nitric acid reaches 90%, which is close to the 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, and then forms an inner circulation flow D and an eddy current E in the two sub-oscillation chambers 103. Under the pushing action of the inner 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 to achieve 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 blockage inside 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 of dangerous reaction systems such as spent fuel reprocessing, particle preparation, and flammable and explosive reaction systems under high flux and anti-blockage requirements; and is suitable for the fields of fine chemicals, material synthesis, environmental governance, energy, etc.

[0048] Although the 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 present invention, and that the scope of the present 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, wherein the oscillation cavity comprises a gradually widening cavity and a gradually narrowing cavity, the narrower end of the gradually widening cavity is connected to a feed channel, the end walls of the narrower end of the gradually widening cavity located on both sides of the feed channel respectively form Coanda steps relative to the two side walls of the feed channel, the wider end of the gradually widening cavity is connected to the wider end of the gradually narrowing cavity, and the narrower end of the gradually narrowing cavity is connected to a discharge channel; A fluid distributor is arranged 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 make the wall-attached flow fluid entering the oscillation cavity 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 area generated by the eddy current, the fluid forms periodic oscillations in the oscillation cavity, thereby inducing chaotic convection.

2. The low-resistance passive high-throughput microreactor based on oscillating flow according to claim 1, characterized in that: The wall surfaces on two opposite sides of the oscillation cavity are in a streamline shape.

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

4. The low-resistance passive high-throughput microreactor based on oscillating flow according to claim 2, characterized in that: The flow divider includes first walls on two opposite sides and second walls on two opposite sides. The first walls on 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. The second walls on 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.

5. The low-resistance passive high-throughput microreactor based on oscillating flow according to claim 4, characterized in that: 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.

6. The low-resistance passive high-throughput microreactor based on oscillating 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 of the order of 10 -3 ~10 0 mm.

7. The low-resistance passive high-throughput microreactor based on oscillating 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.

8. The low-resistance passive high-throughput microreactor based on oscillating flow according to claim 1, characterized in that: The feed channel includes a main feed channel and multiple feed branch channels, one end of each of the multiple feed branch channels is provided with a reactant inlet, the other end of each of the multiple feed branch channels is connected to the main feed channel, and the main feed channel is connected to the narrower end of the gradually widened cavity.

9. The low-resistance passive high-throughput microreactor based on oscillating flow according to any one of claims 1 to 8, characterized in that: The oscillation cavity and the flow divider constitute an oscillator, and the oscillator is symmetrical or asymmetrical.

10. The low-resistance passive high-throughput microreactor based on oscillating flow according to claim 9, 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.

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