CN115253834A - High-flux passive swirl-enhanced micro mixer - Google Patents
High-flux passive swirl-enhanced micro mixer Download PDFInfo
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- CN115253834A CN115253834A CN202210913993.6A CN202210913993A CN115253834A CN 115253834 A CN115253834 A CN 115253834A CN 202210913993 A CN202210913993 A CN 202210913993A CN 115253834 A CN115253834 A CN 115253834A
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- 239000000463 material Substances 0.000 claims abstract description 54
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- 239000011797 cavity material Substances 0.000 claims description 68
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 15
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 238000003889 chemical engineering Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
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- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/30—Micromixers
- B01F33/301—Micromixers using specific means for arranging the streams to be mixed, e.g. channel geometries or dispositions
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Abstract
A high-flux passive swirl-enhanced micro-mixer belongs to the technical field of micro-chemical engineering. The high-flux passive swirl-enhanced micro mixer comprises a bottom feeding distributor, a middle feeding distributor, a mixing cavity, a micro-channel flow-dividing element and a mixing cavity upper cover plate. The micro mixer is characterized in that a plurality of splitter plates and a plurality of circular plates are stacked in a staggered manner to form a micro-channel splitter element, so that materials flow from inside to outside, the speed is gradually reduced, and a good initial condition is provided for next laminar diffusion; the inner wall surface of the mixing cavity is of a stepped structure so as to avoid the fluid from attaching to the wall and improve the material mixing efficiency; a swirl element is additionally arranged at the discharge port to improve the disturbance of the converged fluid and further strengthen the mixing effect; compared with a mixer in an outside-in flow mode, the invention is not limited by the size of the central tube, can be flexibly designed according to the flow, and has the characteristics of large flux, high efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of micro chemical engineering, and particularly relates to a high-flux passive swirl-enhanced micro mixer.
Background
The micro mixer is beneficial to improving the product yield in the chemical reaction process, reducing the generation of byproducts and reducing the energy consumption of the chemical reaction by relying on the unique advantages of high-efficiency mass transfer, high heat transfer and small liquid holding capacity, so that the chemical reaction process is green and environment-friendly.
The current micro-mixers include active micro-mixers and passive micro-mixers, the active micro-mixers mix the fluid by external excitation; the passive micro mixer can increase the chaos flow degree of the fluid through various micro-channel structures to realize the purpose of rapid mixing. The passive micro mixer is widely applied due to the characteristics of simple structure, easy integration, no need of external power source and the like. However, the micromixers currently on the market present the following difficulties:
(1) The conventional Y-shaped, T-shaped, snake-shaped and heart-shaped microchannel mixers have the characteristic size of 10-1000 μm, have smaller flux and are difficult to assemble and disassemble.
(2) The existing large-flux star-shaped micro mixer causes the materials to flow from outside to inside, so that the flow velocity of the materials is increased, and the diffusion mixing time is reduced; in addition, the mixer flowing from outside to inside is limited by the size of the central tube, when the flow is further increased, the diameter of the feeding position is increased, the size of the central tube is increased, but the optimal matching between the flow distance from the feeding to the central tube and the size of the central tube is difficult, and the high-throughput is not facilitated; and the outflow has wall attachment problems at the surface of the central cone, thereby reducing mixing efficiency.
Disclosure of Invention
In order to overcome the defects in the prior art and improve the problems, the invention provides a high-flux passive swirl-enhanced micro-mixer which comprises a bottom feeding distributor, a middle feeding distributor, a mixing cavity, a micro-channel flow dividing element and a mixing cavity upper cover plate which are sequentially connected, wherein the bottom feeding distributor comprises a bottom feeding cavity communicated with an A feeding pipe, the middle feeding distributor comprises a middle feeding cavity communicated with a B feeding pipe, and an A material hole penetrating through the middle feeding distributor is arranged on the periphery of the middle feeding cavity on the middle feeding distributor.
The mixing cavity adopts a structure that a plurality of mixing cavity material holes are formed in the bottom of the mixing cavity and a gradually-expanding mixing cavity is formed in the outlet direction, and the wall surface of the mixing cavity is a smooth wall surface or a stepped wall surface.
The microchannel flow distribution element is arranged in the mixing cavity, the microchannel flow distribution element comprises flow distribution plates and circular plates which are sequentially staggered and stacked, the peripheries of the flow distribution plates are provided with bulges, the flow distribution plates and the adjacent circular plates form microchannels which are gradually enlarged from inside to outside, and the adjacent flow distribution plates are staggered; the microchannel flow dividing element consisting of the flow dividing plate and the circular plate is provided with a material hole of the flow dividing element which penetrates through the material hole of the mixing cavity body at the position corresponding to the material hole.
The upper cover plate of the mixing cavity is communicated with an outlet pipe.
In some embodiments, the micro mixer further includes a cyclone element, one end of the cyclone element is connected to the microchannel flow dividing element, the other end of the cyclone element is connected to the upper cover plate, and the cyclone element is of a structure in which a plurality of cyclone blades are arranged on a cyclone base plate.
In some embodiments, the number of steps on the step wall surface is 3 to 10, the height is 0.5 to 5mm, and the width is 0.1 to 5mm.
In some embodiments, the number of the splitter plates is 10 to 500, the protrusions on the splitter plates are oval, circular or triangular, the number of the protrusions is n, and the staggered angle between adjacent splitter plates is 180/n degrees; wherein n is an even number from 6 to 50.
In some embodiments, the thickness of the shunt plate is 10-1000 μm, and the height h of the top end of the protrusion from the center of the material hole of the shunt element is 0.5-20 mm; the thickness of the circular plate is 10-1000 μm, and the diameter is 10-300mm.
In some embodiments, the maximum equivalent diameter of the diverter plate is no greater than the diameter of the circular plate.
In some embodiments, the equivalent diameter of the flow distribution element material apertures is from 0.5mm to 20mm.
In some embodiments, the swirl element comprises at least 3 swirl vanes, the swirl vanes being arcuate or linear.
In some embodiments, the thickness of the swirl vane is 0.3-5mm, the height is 2-50mm, and the diameter of the swirl bottom plate is not larger than the diameter of the circular plate.
In some embodiments, the mixing cavity material holes 4-1 are sequentially and alternately communicated with the middle feeding cavity 3-1 and the bottom feeding cavity 2-1. The material hole 4-1 of the mixing cavity body is communicated with the material hole A of the bottom feeding cavity 2-1.
In some embodiments, the flow distribution element material aperture is disposed at a groove where two adjacent protrusions are connected.
The invention has the following beneficial effects:
the micro mixer is designed into a detachable structure, so that the micro mixer is easy to process, convenient to maintain and reuse, and the processing difficulty and the use cost of the micro mixer are reduced.
The micro mixer sequentially and alternately stacks the plurality of flow distribution plates and the plurality of circular plates, the flow distribution plates are provided with the protruding structures, the flow distribution plates and the circular plates on two sides form a gradually-expanding fluid micro channel, macroscopic fluid is divided into fluid thin layers with micron-sized thickness, the fluid of the small thin layers flows into a mixing cavity, and the fluid thin layers are stacked layer by layer, so that the mutual diffusion time is shortened, the mixing time among materials is shortened, and the mixing efficiency of the materials is improved. The height of the bulge on the flow distribution plate can be designed according to the requirements of fluid and flow, and the flow distribution plate can be suitable for mixing fluids with different properties. The thickness and the maximum diameter of the splitter plate and the circular plate can be changed according to the process conditions, the advantage of uniform mixing of the micro-mixing technology is utilized, and the requirement of large flow in industrial application is met.
One advantage of the splitter plate as the flow rate of the micromixer is increased is that the mixing efficiency of the micromixer of the present invention can be kept efficient while the overall pressure drop remains constant by adjusting the number of material holes and the distance to the boundary of the circular plate.
The wall surface of the mixing cavity is designed to be a stepped wall surface, so that fluid entering the mixing cavity can be separated from the wall surface in advance, the condition that the low-flow-rate fluid is not uniformly mixed due to the wall attachment problem is avoided, and the mixing efficiency is improved.
At least 3 swirl elements with swirl blades are designed to converge fluid and enable the fluid to form a swirl strengthening effect, the turbulence degree of the fluid is increased, the fluid is disturbed, the mixing effect of the fluid under a low Reynolds number is further enhanced, and the mixing efficiency is improved.
The invention makes full use of the characteristic of high-efficiency mass transfer of the microchannel, avoids the defects of small flux of a common micro mixer and nonuniform mixing of a conventional mixer, and adopts a plurality of flow distribution plates and a plurality of circular plates to be superposed to form the large-flux micro mixer with adjustable flux.
Compared with an outside-in mixer, the structure design of the mixer is not limited by the size of the central pipe, when the flow is increased, the diameter of the feeding position can be increased, and the proper distance from the feeding to the flow in the mixing cavity is ensured by adjusting the diameter of the microchannel flow dividing element, so that the reasonable design of the microchannel flow dividing element under the condition of large flow is realized.
Drawings
Fig. 1 is an internal structure view of a high-throughput passive swirl-enhanced micro-mixer.
Fig. 2 is a top view of the middle feed distributor of fig. 1.
Fig. 3 is a perspective view of the microchannel flow dividing element of fig. 1.
Fig. 4 is a top view of the vortex element of fig. 1.
Fig. 5 is a graph of the mixing effect of the micromixer.
Wherein, a is a main view full section mixing effect picture, and b is an outlet section mixing effect picture.
Fig. 6 is a graph of the mixing effect of the micromixer in the literature.
Wherein, a is a main view full section mixing effect picture, and b is an outlet section mixing effect picture.
Fig. 7 is a graph showing the mixing effect of a micromixer provided with swirl elements.
Wherein, a is a main view full section mixing effect picture, and b is an outlet section mixing effect picture.
In the figure: 1. the material mixing device comprises a material inlet pipe A, a material inlet pipe 2, a bottom feeding distributor 2-1, a bottom feeding cavity 3, a middle feeding distributor 3-1, a middle feeding cavity 3-2, a material hole A, a material hole 3-3, a middle feeding distributor bolt hole 4, a mixing cavity 4-1, a material hole of the mixing cavity 4-2, an inner wall surface of the mixing cavity 4-3, a mixing cavity 5, a microchannel flow dividing element 5-1, a circular plate 5-2, a flow dividing plate 5-3, a flow dividing element material hole 5-4, a bulge 5-5, a flow dividing element positioning hole 6, a fixing bolt 7, an upper cover plate 8, an outlet pipe 9, a flow dividing positioning pin 10, a flow dividing element 10-1, a flow dividing blade 10-2, a flow dividing bottom plate 10-3, a flow dividing element positioning hole 11, a sealing ring 1, 12, a sealing ring 2, 13, a material inlet pipe B, a sealing ring 14, a sealing ring 3, 15 and a fixing nut.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 1 shows a high-throughput passive swirl-enhanced micromixer, which comprises a feed pipe a 1, a bottom feed distributor 2, a middle feed distributor 3, a mixing chamber 4, a microchannel flow-dividing element 5, an upper cover plate 7, an outlet pipe 8, a swirl element 10 and a feed pipe b 13.
The bottom feeding distributor 2 comprises a bottom feeding cavity 2-1 communicated with the feeding pipe 1A, the middle feeding distributor 3 comprises a middle feeding cavity 3-1 communicated with the feeding pipe 13B, and the periphery of the middle feeding cavity 3-1 on the middle feeding distributor 3 is provided with a material hole A3-2 (shown in figure 2) penetrating through the middle feeding distributor.
The bottom of the mixing cavity 4 is provided with mixing cavity material holes 4-1, the mixing cavity material holes 4-1 are uniformly distributed on the same circumference as the material holes 3-2A, and the mixing cavity 4 is provided with a mixing cavity 4-3 which has a stepped structure and is gradually enlarged from an inlet to an outlet. The material holes 4-1 of the mixing cavity body are sequentially and alternately communicated with the middle feeding cavity 3-1 and the bottom feeding cavity 2-1. The material hole 4-1 of the mixing cavity body is communicated with the material hole A of the bottom feeding cavity 2-1.
The microchannel flow dividing element 5 is arranged in the mixing cavity 4-3, the microchannel flow dividing element 5 comprises circular plates 5-1 and flow dividing plates 5-2 which are alternately stacked in sequence, the peripheries of the flow dividing plates 5-2 are alternately provided with bulges 5-4, the flow dividing plates 5-2 and the adjacent circular plates 5-1 form outwards-flaring microchannels, and the adjacent flow dividing plates 5-2 are arranged in a staggered mode (as shown in figure 3).
The material holes 5-3 of the flow dividing element are arranged on the micro-channel flow dividing element 5 at the positions corresponding to the material holes of the mixing cavity body, and the positioning holes 5-5 of the flow dividing element are arranged in the middle of the micro-channel flow dividing element 5.
The rotational flow element 10 is of a structure that a rotational flow bottom plate 10-2 is provided with a plurality of uniformly distributed rotational flow blades 10-1, the rotational flow bottom plate 10-2 of the rotational flow element 10 is connected with one end of the micro-channel flow dividing element 5, the outer edge side of the rotational flow bottom plate is communicated with the mixing cavity 4-3, and the middle part of the rotational flow bottom plate is communicated with the outlet pipe 8 (shown in figure 4).
The upper cover plate 7 is arranged above the mixing cavity 4, and the top of the upper cover plate is connected with an outlet pipe 8. The swirl element 10 is arranged in an inner chamber of the upper cover plate 7 communicating with the mixing chamber 4-3.
The rotational flow element 10, the micro-channel flow dividing element 5 and the mixing cavity 4 are positioned by a flow dividing positioning pin 9.
The bottom feeding distributor 2, the middle feeding distributor 3, the mixing cavity 4 and the upper cover plate 7 are fixedly connected through a fixing bolt 6 and a fixing nut 15.
The mixing process of the materials of the high-flux passive swirl-enhanced micro mixer comprises the following steps: taking the mixing process of the material A and the material B as an example, the material A enters the bottom feeding cavity 2 from the feeding pipe 1A, then flows through the material hole 3-2 of the material A from the bottom feeding cavity 2 and enters the material hole 4-1 of the partial mixing cavity body; the material B enters the middle feeding cavity 3-1 from the feeding pipe 13B and then enters the material hole 4-1 of the mixing cavity body from the middle feeding cavity 3-1; the material A and the material B in the material hole 4-1 of the mixing cavity body enter a material hole 5-3 of a flow dividing element of a micro-channel flow dividing element 5, respectively flow out of the micro-channel to form a fluid thin layer with the thickness of micron order, and enter the mixing cavity 4-3 for mixing; the mixed material flows into the swirl element 10 for intensive mixing and finally flows out of the outlet pipe 8.
Example 1
The present invention is compared with a micro mixer reported in the literature (Y, men, V, hessel, etc. Trans IChemE, part A, chem Eng Res Des, 2007,85 (A5): 605-611.), and in order to ensure the consistency of the comparison conditions, the present embodiment employs microchannel flow dividing elements with the same number of layers without swirl elements.
Structural parameters are as follows: the micromixers reported in the invention and documents are provided with 65 circular plates and 65 shunt plates, the thicknesses of the circular plates are all 0.1mm, the diameters of the circular plates are all 22mm, and the equivalent diameters of the material holes of the shunt elements are all 1.5mm. The number of the steps in the mixing cavity is 5, the height of each step is 1mm, the width of each step is 0.5mm, and the circle centers of the material holes of the flow distribution elements are uniformly distributed on the circumference with the diameter of 10 mm. The diameter of the conical bottom of the micro mixer in the reference is 4.8mm, and the height of the conical bottom of the micro mixer is 15mm.
Simulation parameters: the diffusion coefficient of the substance is 2.3e-9m by using Fluent software and taking component transportation as a model2And/s, the flow is 430L/h, the calculated outlet parameters are stable until residual errors converge, and then the outlet mixing efficiency eta of the micro mixer is calculated by the following formula:
as shown in FIG. 5, the mixing efficiency of the invention without the swirl elements is 92%. As shown in fig. 6, the mixing efficiency of the comparative document is 80% under this condition. It can be seen that: under the condition of the same structural parameters, the efficiency of the micro mixer is superior to that of a literature micro mixer. Reason analysis: the conical structure is arranged in the middle of the document micro mixer, so that low-speed fluid is attached to the wall, the mixing effect of the fluid at the center of the section of the outlet is poor, and the overall efficiency is low; the fluid of the micro mixer flows from inside to outside, the speed is gradually reduced, two kinds of fluids are favorably mixed in the mixing cavity, and the stepped wall surface is arranged in the mixing cavity, so that the phenomenon that the fluid attaches to the wall is avoided, and the efficiency is higher.
Example 2
To demonstrate the strengthening effect of the swirl element on the present invention, the mixing effect of the micro-mixer of the present invention with and without the swirl element was compared. The structural parameters of the embodiment are as follows: the curvature radius r of the swirl vanes is 11mm, the thickness t is 0.5mm, the height is 4mm, 6 swirl vanes are uniformly distributed, and other structural parameters are the same as those of the invention in the embodiment 1.
Similar to example 1, as shown in fig. 7, the mixing efficiency of the micromixer (including the swirl element) of the present invention is 97% higher than that of the micromixer without the swirl element, which is 92%. The results show that: the swirl element strengthens the fluid mixing process and improves the efficiency.
The above description is only a part of the embodiments of the present invention, and does not limit the present invention in any way, and those skilled in the art can make some modifications to the structure and technical content disclosed above without departing from the technical scope of the present invention to become equivalent embodiments of the equivalent variations.
For example, the number of the feeding units is not limited in the present invention, and the number of the feeding units can be increased or decreased according to the actual requirement of the number of the mixed materials, and in this case, the material holes of the feeding units are only required to be correspondingly distributed.
Those skilled in the art can easily make any number of modifications, equivalent variations and modifications to the above embodiments without departing from the scope of the present invention without making any creative effort, and other embodiments are within the scope of the present invention.
Claims (9)
1. The utility model provides a micro mixer is reinforceed to passive whirl of high flux, includes bottom feeding distributor, middle part feeding distributor, mixing chamber, microchannel reposition of redundant personnel component and the mixing chamber upper cover plate that connects gradually, its characterized in that: the bottom feeding distributor comprises a bottom feeding cavity communicated with the feeding pipe A, the middle feeding distributor comprises a middle feeding cavity communicated with the feeding pipe B, and material holes A penetrating through the middle feeding distributor are formed in the periphery of the middle feeding cavity;
the bottom of the mixing cavity is provided with a plurality of mixing cavity material holes, a structure of a gradually-expanded mixing cavity is arranged along the outlet direction, and the wall surface of the mixing cavity is a smooth wall surface or a stepped wall surface;
the microchannel flow distribution element is placed in the mixing cavity and comprises flow distribution plates and circular plates which are sequentially stacked in a staggered manner, bulges are arranged on the peripheries of the flow distribution plates, the flow distribution plates and the adjacent circular plates form a microchannel which is gradually enlarged from inside to outside, and the adjacent flow distribution plates are arranged in a staggered manner; a material hole of the flow distribution element is arranged at the position of the micro-channel flow distribution element consisting of the flow distribution plate and the circular plate, which corresponds to the material hole of the mixing cavity body and penetrates through the micro-channel flow distribution element;
the upper cover plate of the mixing cavity is communicated with an outlet pipe.
2. The high throughput passive swirl enhanced micromixer of claim 1, wherein: the micro mixer further comprises a rotational flow element, one end of the rotational flow element is connected with the micro channel flow distribution element, the other end of the rotational flow element is connected with the upper cover plate, and the rotational flow element is of a structure that a plurality of rotational flow blades are arranged on a rotational flow bottom plate.
3. The high throughput passive swirl enhanced micromixer of claim 1, wherein: the number of the steps on the wall surface of the steps is 3-10, the height is 0.5-5mm, and the width is 0.1-5mm.
4. The high throughput passive swirl enhanced micromixer of claim 1, wherein: the number of the splitter plates is 10-500, the protrusions on the splitter plates are oval, round or triangular, the number of the protrusions is n, and the staggered angle between the adjacent splitter plates is 180/n degrees;
wherein n is an even number from 6 to 50.
5. A high throughput passive swirl enhanced micro-mixer according to any of claims 1-4, wherein: the thickness of the shunt plate is 10-1000 mu m, and the height h from the top end of the bulge to the center of the material hole of the shunt element is 0.5-20 mm; the thickness of the circular plate is 10-1000 μm, and the diameter is 10-300mm.
6. The high throughput passive swirl enhanced micro-mixer of claim 5, wherein: the maximum equivalent diameter of the splitter plate is no greater than the diameter of the circular plate.
7. A high throughput passive swirl enhanced micro-mixer according to any of claims 1-4, wherein: the equivalent diameter of the material hole of the flow dividing element is 0.5-20mm.
8. A high throughput passive swirl enhanced micromixer according to any of claims 1-4, characterized in that: the swirl element comprises at least 3 swirl blades which are arc-shaped or linear.
9. The high throughput passive swirl enhanced micromixer of claim 8, wherein: the thickness of the rotational flow blade is 0.3-5mm, the height is 2-50mm, and the diameter of the rotational flow bottom plate is not larger than that of the circular plate.
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| CN202210913993.6A CN115253834B (en) | 2022-08-01 | 2022-08-01 | High-flux passive type rotational flow reinforced micro-mixer |
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| US20070263485A1 (en) * | 2006-05-09 | 2007-11-15 | Jing-Tang Yang | Twin-vortex micromixer for enforced mass exchange |
| JP2017006918A (en) * | 2016-09-13 | 2017-01-12 | 国立研究開発法人産業技術総合研究所 | Multistage split flow path type mixer and mixing method |
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| CN114053920A (en) * | 2021-11-17 | 2022-02-18 | 锦州镁赫化学科技有限公司 | Micro mixer |
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