CN217042339U - Quick micro-mixer with variable cross section - Google Patents
Quick micro-mixer with variable cross section Download PDFInfo
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- CN217042339U CN217042339U CN202122361733.6U CN202122361733U CN217042339U CN 217042339 U CN217042339 U CN 217042339U CN 202122361733 U CN202122361733 U CN 202122361733U CN 217042339 U CN217042339 U CN 217042339U
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Abstract
The utility model relates to a variable cross-section rapid micro-mixer, which comprises a liquid inlet part, a solution mixing part and a mixed liquid outlet part, wherein the liquid inlet part is communicated with the inlet end of the solution mixing part, and the mixed liquid outlet part is communicated with the outlet end of the solution mixing part; the liquid inlet part comprises a first inlet and a second inlet, and one end of the first inlet and one end of the second inlet are converged to the inlet end of the solution mixing part; wherein, the flow channel of the solution mixing part is of a curve-shaped structure; the cross section of the flow passage of the solution mixing part is triangular or elliptical; the utility model discloses a change the cross sectional shape of solution mixing part curve runner and make the fluid can produce stronger Dean at the flow in-process and flow, strengthen mixing between the fluid, all have good mixed effect to the fluid of different reynolds numbers.
Description
Technical Field
The utility model relates to a quick micromixer of variable cross section belongs to micro-fluidic technical field.
Background
Microfluidics plays an increasingly important role in biochips and lab-on-a-chip applications, and efficient mixing of fluids is required to be addressed when two or more fluids undergo chemical reactions, so micromixers are an important component of microfluidic systems. Since the size of the flow channel structure of the micro mixer is small, usually in micron order, the reynolds number (reynolds number, which is the ratio between the inertial force and the viscous force when the fluid flows, and usually is a standard for determining the flow state of the fluid) added to the fluid is very small, and the flow channel is in a laminar state, and molecules between adjacent flow channels are mixed in a diffusion manner.
In the prior art, most of the micro mixers are designed to achieve the mixing purpose within a single reynolds number range, for example, a straight flow channel has a good mixing effect in a low reynolds number state, and a spiral flow channel has a good mixing effect in a high reynolds number state, which limits the versatility of the micro mixer. Moreover, for a single micro-channel structure, such as a straight channel, the mixing process is relatively slow, and external power is required to be continuously supplied to overcome the great loss of the system pressure, so that the advantage of high micro-fluidic analysis speed is weakened or even eliminated.
Along with the rapid development of 3D printing technology, the printing precision is higher and higher, especially based on face solidification 3D prints, and the processing breadth is big, and the precision can reach 5 microns, not only can once print traditional individual layer rectangle cross-section miniflow channel, also can realize the runner structure processing of multilayer complicated cross-section, helps realizing the design that becomes more meticulous of miniflow channel size structure, still lacks the quick mixing performance of relevant product in order to satisfy fluid under the microscale at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a quick micromixer of variable cross section can promote the fluid mixing velocity under the microscale, promotes different fluidic mixes.
The utility model provides a technical scheme that its technical problem adopted is:
a variable cross-section rapid micro mixer comprises a liquid inlet part, a solution mixing part and a mixed liquid outlet part, wherein the liquid inlet part is communicated with the inlet end of the solution mixing part, and the mixed liquid outlet part is communicated with the outlet end of the solution mixing part;
the liquid inlet part comprises a first inlet and a second inlet, and one end of the first inlet and one end of the second inlet are converged to the inlet end of the solution mixing part;
wherein, the flow channel of the solution mixing part is of a curve-shaped structure;
the cross section of a flow passage of the solution mixing part is triangular or elliptical;
as a further preferred embodiment of the present invention, the flow channel of the solution mixing portion is disposed in a spiral shape, an S shape, or a Z shape;
in a further preferred embodiment of the present invention, the flow path cross section of the liquid inlet portion and the mixed liquid outlet portion is rectangular.
As a further preference of the present invention, the inlet end of the liquid inlet portion and the inlet end of the solution mixing portion are connected through a transition curved surface flow passage, and the outlet end of the mixed liquid outlet portion and the outlet end of the solution mixing portion are also connected through a transition curved surface flow passage;
as a further preference of the present invention, the ratio of the length to the width of the cross section of the liquid inlet portion and the mixed liquid outlet portion is in the range of 3:2 to 2: 1;
as a further preference of the present invention, when the cross section of the flow channel of the solution mixing portion is triangular, it is an isosceles triangle, and the height and the bottom of the triangle are respectively matched with the length and the width of the cross section of the liquid inlet portion;
when the cross section of the flow channel of the solution mixing part is in an oval shape, the length of the long axis and the length of the short axis of the oval are respectively matched with the length and the width of the cross section of the liquid inlet part;
as a further preferred aspect of the present invention, when the flow path of the solution mixing portion is spirally arranged, the number of cycles of the spiral shape is greater than 2;
when the flow channel of the solution mixing part is arranged in an S shape or a Z shape, the cycle number is more than 5;
as a further preference of the present invention, the first inlet, the second inlet and the transition curved surface flow passage are in a T-shaped or Y-shaped cross structure;
as a further preference of the present invention, the first inlet includes an inlet a and an inlet B, and the inlet a, the inlet B, the second inlet and the transition curved surface flow channel are in a cross structure.
Through above technical scheme, for prior art, the utility model discloses following beneficial effect has:
1. the micro mixer provided by the utility model adopts the design of the curved flow channel, and the dean flow generated by the curved flow channel is more beneficial to mixing different fluids under the same Reynolds number;
2. the utility model provides a micro mixer has carried out the restriction to the length-width ratio of runner cross-section, has improved the speed that solution mixes.
Drawings
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is a schematic overall structure diagram of a preferred embodiment provided by the present invention;
FIG. 2 is a schematic view of a flow channel with a double spiral triangular cross section according to a preferred embodiment of the present invention;
FIG. 3 is a schematic view of a preferred embodiment of the present invention showing S-shaped and Z-shaped triangular cross-section flow channels;
FIG. 4 is a schematic view of the preferred embodiment of the present invention showing the flow channel with S-shaped and Z-shaped oval cross-sections;
FIGS. 5 a-5C are schematic illustrations of dean flow at different Reynolds numbers for a rectangular cross-section of the flow path, based on position C3-3 in FIG. 1, where the Reynolds number in FIG. 5a is 1, the Reynolds number in FIG. 5b is 30, and the Reynolds number in FIG. 5C is 100;
FIGS. 6 a-6C are schematic views of dean flow at different Reynolds numbers for a triangular cross-section of the flow channel, based on position C3-3 in FIG. 1, where the Reynolds number in FIG. 5a is 1, the Reynolds number in FIG. 5b is 30, and the Reynolds number in FIG. 5C is 100;
FIGS. 7 a-7C are schematic illustrations of dean flow at different Reynolds numbers for an elliptical cross-section of the flow passage, based on position C3-3 in FIG. 1, where the Reynolds number in FIG. 5a is 1, the Reynolds number in FIG. 5b is 30, and the Reynolds number in FIG. 5C is 100;
fig. 8 is a schematic diagram of the length and width of a cross section according to the FICK theorem.
In the figure: 1 is a liquid inlet part, 2 is a solution mixing part, and 3 is a mixed liquid outlet part.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. In the description of the present application, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, "first", "second", etc., do not represent the degree of importance of the component parts, and thus, are not to be construed as limiting the present invention. The specific dimensions used in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
Aiming at the problem that the existing micro mixer on the market pointed out in the background technology is single in shape and cannot really improve the micro-fluidic analysis speed, the application aims to provide the variable-section quick micro mixer which can promote the mixing speed of a mixed solution.
The device mainly comprises a liquid inlet part 1, a solution mixing part 2 and a mixed liquid outlet part 3, wherein the liquid inlet part is communicated with the inlet end of the solution mixing part, and the mixed liquid outlet part is communicated with the outlet end of the solution mixing part; the liquid inlet part comprises a first inlet and a second inlet which can respectively flow different solutions, and one end of the first inlet and one end of the second inlet are converged to the inlet end of the solution mixing part; the part capable of accelerating the mixing speed is a solution mixing part, and a flow passage of the solution mixing part is arranged in a curve-shaped structure, wherein the flow passage of the curve-shaped structure is arranged in a spiral shape, an S shape or a Z shape; meanwhile, the cross section of the flow channel of the solution mixing part is ensured to be triangular or elliptical (the cross section of the flow channel can be constant and can also be expanded and contracted), because when curve design is adopted, the Dean number generated by the flow channel with the triangular or elliptical cross section is obviously higher than that generated by a rectangular flow channel under the same Reynolds number, the Dean flow is a double-helix phenomenon generated by viscous fluid flowing in a curve, and generally, the larger the Dean number is, the more Dean vortexes are excited, and the more the fluid is mixed.
The calculation formula of dean flow intensity is given in conjunction with figure 1 for explanation,
De＝Re·(r1/R c ) 0.5
where De is dean number, Re is Reynolds number, R1 is bend radius, R c Is the radius of the coil; as can be seen from the above formula, the flow channel of the solution mixing portion is arranged in a curved configuration at the same Reynolds number, and the cross section of the flow channel of the solution mixing portion is ensured to be triangular or elliptical (R1/R) c ) Larger than other shapes, e.g. rectangular (R1/R) c ) Therefore, the number of dean generated by the flow passage with the triangular or elliptical cross section is obviously increased, and dean vortex is increased; meanwhile, dean vortex is easily generated in a simulation experiment by the aid of the triangular or elliptical flow channel.
Then, in order to explain the shape of the flow channel conveniently, when the cross section of the flow channel of the solution mixing part is in a triangular shape, the flow channel is in an isosceles triangle shape, and the height and the bottom of the triangle are respectively matched with the length and the width of the cross section of the liquid inlet part; when the cross section of the flow passage of the solution mixing part is in an oval shape, the length of the long axis and the length of the short axis of the oval are respectively matched with the length and the width of the cross section of the liquid inlet part;
in the present application, the restriction range of the flow passage cross-sectional length to width ratio of the liquid inlet portion and the mixed liquid outlet portion is defined as3:2-2:1, according to FICK theorem
In the formula, l is the thickness of the diffusion layer, D is the diffusion coefficient, and t is the time required by complete mixing, so that the smaller l is, the faster the two solutions are mixed; l and h correspond to the length and width shown in fig. 8, and when the cross-sectional area a ═ l × h or the hydraulic diameter d ═ 4A/s (s is the cross-sectional perimeter) is constant, h: the larger l the faster the fluid mixes, typically h in view of manufacturing process constraints: l is set to be between 3:2 and 2: 1.
The factors affecting the mixing effect of the solution are also related to the cross-sectional area A, which is explained here, and the calculation formula of the solution mixing is
Where ci and ci-represent the concentration and average concentration at the outlet, c0 and c 0-represent the concentration and average concentration at the inlet, and A represents the cross-sectional area, the MI is known C The larger the mixing effect, the better the mixing effect, and the most easily affected is A, so the cross section of the flow channel of the solution mixing part of the present application is triangular or elliptical.
Simulation experiments also find that the flow channel of the solution mixing part is arranged in a spiral shape or an S shape or a Z shape, the effect is best, of course, the length of the curve flow channel design of the whole solution mixing part is also required to be limited, and the mixing degree of the solution is also influenced by too short length, so that when the flow channel of the solution mixing part is arranged in a spiral shape, the number of circulation circles of the spiral shape is more than 2, and when the flow channel of the solution mixing part is arranged in an S shape or a Z shape, the number of circulation circles is more than 5; the length of the flow channel of the solution mixing part is increased, the mixing efficiency is ensured when the flow channel of the solution mixing part reaches more than 25mm, and the mixing efficiency can be ensured to exceed 0.8 when the Reynolds number is less than 5 or more than 30, so that the mixing effect is better.
In order to ensure the smooth mixing of the solution, the liquid inlet part is connected with the inlet end of the solution mixing part through a transition curved surface flow passage, and the mixed liquid outlet part is connected with the outlet end of the solution mixing part through a transition curved surface flow passage.
With reference to fig. 5a to 7C, the nine diagrams are all tested at the position C3-3 of the flow channel of the solution mixing part in fig. 1, and it can be known that when the flow channel of the solution mixing part is designed by using curves, Dean generated by the flow channel with the triangular cross section and the flow channel with the elliptical cross section are obviously stronger than those generated by the flow channel with the rectangular cross section under the same reynolds number.
In the application, the shape of the liquid inlet part is also optimized, different liquids can be conveniently and quickly collected, and the first type is that the first inlet, the second inlet and the transition curved surface flow channel are in a T-shaped or Y-shaped cross structure.
Secondly, the first inlet comprises an inlet A and an inlet B, and the inlet A, the inlet B, the second inlet and the transition curved surface flow passage are in a cross structure.
In conclusion, the flow channels of the solution mixing part of the application adopt triangular and elliptical cross sections, and the spiral flow channels weaken the inertia and viscosity of each flow layer fluid by collision and flow distribution of each flow layer fluid, so that the contact area and convection effect of liquids with different concentrations are increased, and the mixing effect is good for the fluids with different Reynolds numbers.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components through other components.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the description, and must be determined according to the scope of the claims.
Claims (9)
1. A variable cross-section rapid micro-mixer is characterized in that: the device comprises a liquid inlet part (1), a solution mixing part (2) and a mixed liquid outlet part (3), wherein the liquid inlet part (1) is communicated with the inlet end of the solution mixing part (2), and the mixed liquid outlet part (3) is communicated with the outlet end of the solution mixing part (2);
the liquid inlet part (1) comprises a first inlet and a second inlet, and one end of the first inlet and one end of the second inlet are converged to the inlet end of the solution mixing part (2);
wherein, the flow channel of the solution mixing part (2) is of a curve-shaped structure;
the cross section of the flow passage of the solution mixing part (2) is triangular or elliptical.
2. A variable-section rapid micromixer according to claim 1, characterized in that: the flow channel of the solution mixing part (2) is arranged in a spiral shape or an S shape or a Z shape.
3. A variable-section rapid micromixer according to claim 1, characterized in that: the cross sections of the flow passages of the liquid inlet part (1) and the mixed liquid outlet part (3) are rectangular.
4. A variable-section rapid micromixer according to claim 1, characterized in that: the liquid inlet part (1) is connected with the inlet end of the solution mixing part (2) through a transition curved surface flow passage, and the mixed liquid outlet part (3) is connected with the outlet end of the solution mixing part (2) through the transition curved surface flow passage.
5. A variable section rapid micromixer according to claim 1 wherein: the ratio of the length to the width of the flow channel section of the liquid inlet part (1) and the mixed liquid outlet part (3) is 3:2-2: 1.
6. A variable-section rapid micromixer according to claim 5, characterized in that: when the cross section of the flow channel of the solution mixing part (2) is triangular, the flow channel is in an isosceles triangle shape, and the height and the bottom of the triangle are respectively matched with the length and the width of the cross section of the liquid inlet part (1);
when the cross section of the flow passage of the solution mixing part (2) is in an ellipse shape, the major axis length and the minor axis length of the ellipse are respectively matched with the length and the width of the cross section of the liquid inlet part (1).
7. A variable-section rapid micromixer according to claim 2, characterized in that: when the flow channel of the solution mixing part (2) is spirally arranged, the number of the spiral circulation turns is more than 2;
when the flow channels of the solution mixing part (2) are arranged in an S shape or a Z shape, the circulation number is more than 5.
8. A variable-section fast micromixer according to claim 4, characterized in that: the first inlet, the second inlet and the transition curved surface flow passage are in a T-shaped or Y-shaped cross structure.
9. A variable-section fast micromixer according to claim 4, characterized in that: the first inlet comprises an inlet A and an inlet B, and the inlet A, the inlet B, the second inlet and the transition curved surface flow passage are of a cross structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122361733.6U CN217042339U (en) | 2021-09-28 | 2021-09-28 | Quick micro-mixer with variable cross section |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122361733.6U CN217042339U (en) | 2021-09-28 | 2021-09-28 | Quick micro-mixer with variable cross section |
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