CN211358643U

CN211358643U - Four-electrode micro-channel mixer

Info

Publication number: CN211358643U
Application number: CN201922109805.0U
Authority: CN
Inventors: 何孝涵; 史小明; 钟翔涛; 黄志维; 邓鲁豫; 周腾; 史留勇
Original assignee: Hainan University
Current assignee: Hainan University
Priority date: 2019-11-30
Filing date: 2019-11-30
Publication date: 2020-08-28
Anticipated expiration: 2029-11-30

Abstract

The utility model belongs to micro-fluidic chip field specifically discloses a four electrode microchannel mixers, including two entrances, an export, little mixing channel, 4 electrodes, mixing chamber, zigzag dog. By applying 4 electrodes in the mixing chamber at 90-degree intervals, the laminar flow state of the fluid is disturbed by the electric field force generated by the electrodes, so that the two fluids are mixed. The utility model is characterized in that: the mixing of microfluid can be realized only by applying proper alternating voltage on the electrodes, and the complex design of a mixing chamber and a mixing channel is not needed, so that the mixing efficiency is greatly improved.

Description

Four-electrode micro-channel mixer

Technical Field

The utility model relates to a microchannel mixer especially relates to a four electrode microchannel mixer.

Background

The micro-fluidic chip becomes the popular field of research by the characteristics of miniaturization, portability, integration, low cost and the like, and the supported micro-fluidic technology becomes a brand-new technology applied to multiple fields of machinery, biomedicine, chemical engineering, aerospace and the like; all can use the microchannel mixer before carrying out experimental reaction in many fields such as chemistry experiment, environmental monitoring, DNA detection, realize the intensive mixing of multiple reagent under the different requirements, excellent performance's microchannel mixer has characteristics and cost lower quick, high efficiency, easily integrated, simple structure, mixes well.

Mixing on a macro scale generally refers to unit operations in which two or more materials are dispersed within each other to some degree of homogeneity by means of mechanical or hydrodynamic forces; the micron-scale mixing is very different from the macro-fluid mixing because the convection effect of the micro-fluid is not obvious at the micron scale, and in this case, the mixing of the micro-fluid mainly depends on the diffusion effect between molecules, so that the micro-fluid mixing becomes difficult under certain experimental requirements.

Based on this, the utility model provides a little mixing channel single structure, electrode design is simple, mixes the obvious microchannel mixer of effect, relies on the electric field force drive, realizes that two kinds of different concentration microfluids mix.

Disclosure of Invention

An object of the utility model is to provide a four electrode microchannel mixers with novel structure for further simplify the electrode design, optimize miniflow channel structure. The diameter of the excircle of the mixing chamber (6) is 30 micrometers, the width of the first inlet (1) and the width of the second inlet (2) are both 5 micrometers, the width of the outlet (10) is 10 micrometers, the width of the micro-mixing channel (3) is 10 micrometers, and the length of the micro-mixing channel is 40 micrometers; the sawtooth-shaped stop block (7) is a cuboid, two triangular prisms with isosceles right triangle bottom edges are cut off on the left side, and chamfering processing is carried out on each edge of the polyhedron; the microchannel mixer is of a symmetrical structure, and the axes of the first inlet (1) and the second inlet (2) form an included angle of 30 degrees with the symmetrical axis of the microchannel mixer respectively.

The technical scheme of the utility model is that: a four-electrode micro-channel mixer is characterized in that two kinds of micro-fluids with different concentrations are injected from a first inlet (1) and a second inlet (2) respectively, sequentially flow through a micro-mixing channel (3) and a mixing chamber (6), and flow out from an outlet (10), and the original laminar flow state is broken due to the action of four electrodes and a zigzag stop block (7) in the space of the mixing chamber, so that the two kinds of micro-fluids are mixed.

The utility model is characterized in that: the utility model relates to a four-electrode micro-channel mixer, the micro-mixing channel has a single design structure, the electrode has a simple design structure, and compared with the traditional active micro-channel mixer, the utility model is more convenient for mass production; and the utility model has the advantages of, compare other microchannel mixers and have more optimized structure, can realize that microfluid efficient mixes more.

Drawings

FIG. 1 is a schematic diagram of a two-dimensional structure of a four-electrode microchannel mixer, in which: the device comprises a first inlet (1), a second inlet (2), a micro-mixing channel (3), a first electrode (4), a second electrode (5), a mixing chamber (6), a zigzag stop block (7), a third electrode (8), a fourth electrode (9) and an outlet (10).

FIG. 2 is a flow diagram of the interior of a four-electrode microchannel mixer, where the convection of two microfluids can be enhanced at each vortex to achieve mixing.

FIG. 3 is a schematic of the fluid concentration for a four-electrode microchannel mixer, and it can be seen that the first inlet has a concentration of 0mol/m³The concentration of the second inlet is 1mol/m³The concentration at the outlet of the channel is close to 0.5mol/m³。

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.

A four-electrode micro-channel mixer comprises a first inlet (1), a second inlet (2), a micro-mixing channel (3), a first electrode (4), a second electrode (5), a mixing chamber (6), a zigzag stop block (7), a third electrode (8), a fourth electrode (9) and an outlet (10).

Specifically, the fluid characteristics of the four-electrode micro-channel mixer are that a first micro fluid to be mixed is injected from a first inlet (1) at an initial flow rate of 0.1mm/s, and a second micro fluid to be mixed is injected from a second inlet (2) at an initial flow rate of 0.1 mm/s; both microfluidics conductivities were 0.12 mS/m; the initial pressure of injecting the microfluid from the first inlet (1) and the second inlet (2) is zero.

Specifically, four electrodes are uniformly distributed on the outer circumference of a mixing chamber (6) at intervals of 90 degrees and are applied with alternating voltage, wherein the first electrode (4) and the fourth electrode (9) are applied with the same alternating voltage, the voltage value is-V0 = -sin (omega ∙ t), the second electrode (5) and the third electrode (8) are applied with the same alternating voltage, and the angular frequency values are all omega =16 pi rad/s.

In particular to a four-electrode micro-channel mixer, the concentration of microfluid injected from a first inlet (1) is 0mol/m³The concentration of the microfluid entering from the second inlet (2) is 1mol/m³The mixed micro-fluid concentration theoretical value flowing out from the outlet (10) of the micro-fluid mixer is 0.5mol/m³。

Claims

1. A four-electrode micro-channel mixer comprises a first inlet (1), a second inlet (2), a micro-mixing channel (3), a first electrode (4), a second electrode (5), a mixing chamber (6), a zigzag stop block (7), a third electrode (8), a fourth electrode (9) and an outlet (10); the method is characterized in that: two kinds of microfluid of different concentration enter from first entry (1), second entry (2) respectively, flow through little mixing channel (3) and mixing chamber (6) in proper order, flow out from export (10), because of the effect of four electrodes and zigzag dog (7) in mixing chamber (6) space, the laminar flow state is broken, impels two kinds of microfluid to mix.

2. The four-electrode microchannel mixer according to claim 1, wherein the diameter of the outer circle of the mixing chamber (6) is 30 μm, the width of the first inlet (1) and the width of the second inlet (2) are both 5 μm, the width of the outlet (10) is 10 μm, the width of the micro-mixing channel (3) is 10 μm, the zigzag block (7) is a rectangle with a length of 20 μm and a width of 10 μm, and is formed by cutting two isosceles right triangles with an oblique side length of 10 μm at the left side; the microchannel mixer is of a symmetrical structure, and the axes of the first inlet (1) and the second inlet (2) form an included angle of 30 degrees with the symmetrical axis of the microchannel mixer respectively.

3. The four-electrode microchannel mixer of claim 1, wherein 4 electrodes are uniformly distributed on the outer circumference of the mixing chamber (6), and the included angles formed by the two adjacent electrodes and the center of the mixing chamber are both 90 degrees.

4. The four-electrode microchannel mixer according to claim 1, wherein the zigzag block (7) is a rectangular parallelepiped, two triangular prisms of which the bases are isosceles right triangles are cut off on the left side, and each edge of the polyhedron is chamfered.

5. A four-electrode micro-channel mixer according to claim 1, characterized in that the micro-mixing channel (3) has a length of 40 μm.