CN216093735U

CN216093735U - Sawtooth-shaped straight channel micro mixer

Info

Publication number: CN216093735U
Application number: CN202122407386.6U
Authority: CN
Inventors: 何纪新; 吴之豪; 刘宏举; 卞钦; 吴涛; 赵俊程; 史留勇; 周腾
Original assignee: Hainan University
Current assignee: Hainan University
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2022-03-22
Anticipated expiration: 2031-10-08

Abstract

The utility model belongs to the field of microfluidic chips, and particularly discloses a sawtooth-shaped straight channel micro mixer which comprises 1 inlet, 1 outlet, a micro mixing channel and 16 electrodes. Electrodes with opposite polarities are symmetrically arranged on the upper side and the lower side of the micro-mixing channel respectively, and the laminar flow state of the fluid is disturbed by electric field force generated by the four 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 channel is not needed, so that the mixing efficiency is greatly improved.

Description

Sawtooth-shaped straight channel micro mixer

Technical Field

The utility model relates to a straight channel mixer, in particular to a sawtooth-shaped straight channel micro mixer.

Background

The micro-fluidic chip technology integrates basic operation units of sample preparation, reaction, separation, detection and the like in the biological, chemical and medical analysis process into a micron-scale chip, and automatically completes the whole analysis process. Due to its great potential in the fields of biology, chemistry, medicine and the like, the method has been developed into a new research field crossing the disciplines of biology, chemistry, medicine, fluid, electronics, materials, machinery and the like. The micro-fluidic chip technology can be applied to the fields of biology, medicine, materials science and the like in multiple layers and multiple directions. The microfluidic chip has good biocompatibility and optical transparency, and can be integrated on a large scale, and the characteristics provide more possibility for scientific research.

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.

The micro-fluid mixer can be divided into a passive micro-fluid mixer and an active micro-fluid mixer, the passive mixer increases the mixing area among fluids mainly by changing the shape of a micro-channel or adding barriers and the like in the channel so as to enhance the diffusion effect, and on the other hand, the carefully designed pipeline shapes or barriers can generate chaotic flow so as to enhance the convection among the fluids; active mixers rely on a variety of external energies to achieve mixing, such as pressure, temperature, magnetic, acoustic, and electric fields. Compared with a passive mixer, the active mixer can achieve sufficient mixing only by less time and mixing distance, and the active mixer also has the switching characteristic that the mixing function can be switched on or off at any time according to the mixing requirement, but the active mixer is complex in structure and high in cost.

Based on the micro-mixing channel, the micro-channel mixer provided by the utility model has the advantages of single structure, simple electrode design and obvious mixing effect, and is driven by electric field force to realize mixing of microfluid with two different concentrations.

Disclosure of Invention

The utility model aims to provide a sawtooth-shaped straight channel micro mixer which is used for further simplifying the electrode design and optimizing the micro flow channel structure. The width of the inlet (1) and the width of the outlet (11) are both 5 micrometers, the width of the micro-mixing channel (2) is also 5 micrometers, and the length of the micro-mixing channel is 50 micrometers; the mixer is of a symmetrical structure, and the sawtooth-shaped electrodes are symmetrically arranged up and down along the center line of the mixer.

The technical scheme of the utility model is that: a zigzag straight channel micromixer, two microfluids with different concentrations are injected from an inlet (1) in parallel, flow through a micromixer channel (2) and flow out from an outlet (11), and the original laminar flow state is broken due to 16 electrodes in the mixing channel, so that the two microfluids are mixed.

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

Drawings

Fig. 1 is a schematic two-dimensional structure diagram of a zigzag straight channel micromixer, wherein: the micro-mixing channel comprises an inlet (1), a micro-mixing channel (2), a first electrode (3), a second electrode (4), a third electrode (5), a fourth electrode (6), a fifth electrode (7), a sixth electrode (8), a seventh electrode (9), an eighth electrode (10), a ninth electrode (12), a tenth electrode (13), an eleventh electrode (14), a twelfth electrode (15), a thirteenth electrode (16), a fourteenth electrode (17), a fifteenth electrode (18), a sixteenth electrode (19) and an outlet (11).

Fig. 2 is a potential diagram of a zigzag straight channel micromixer, in which: the electric field generated by the upper and lower electrodes acts on the micro-mixing channel to promote the mixing of the two micro-fluids.

FIG. 3 is a schematic diagram of fluid concentration in a zigzag straight channel micromixer, and it can be seen that the fluid concentration in the upper layer of the inlet (1) is 1mol/m³The concentration of the lower layer fluid is 0mol/m³The concentration of the channel outlet (11) 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 zigzag straight channel micromixer comprises an inlet (1), a micromixer channel (2), a first electrode (3), a second electrode (4), a third electrode (5), a fourth electrode (6), a fifth electrode (7), a sixth electrode (8), a seventh electrode (9), an eighth electrode (10), a ninth electrode (12), a tenth electrode (13), an eleventh electrode (14), a twelfth electrode (15), a thirteenth electrode (16), a fourteenth electrode (17), a fifteenth electrode (18), a sixteenth electrode (19) and an outlet (11);

specifically, the fluid characteristics of the zigzag straight channel micro-mixer are as follows, a first micro-fluid to be mixed is injected from the upper layer of an inlet (1), the initial flow rate is 0.1mm/s, a second micro-fluid to be mixed is injected from the lower layer of the inlet (1), and the initial flow rate is 0.1 mm/s; both microfluidic conductivities were 0.12 mS/m.

1. Specifically, 16 electrodes are vertically and symmetrically distributed on a convex sawtooth angle along a symmetrical central line, the included angle between two adjacent electrodes on the same side is 90 degrees, alternating voltages are applied to the electrodes, wherein the same alternating voltages are applied to a first electrode (3), a second electrode (4), a third electrode (5), a fourth electrode (6), a fifth electrode (7), a sixth electrode (8), a seventh electrode (9) and an eighth electrode (10), and the voltage value is V0= sin (ω t); the ninth electrode (12), the tenth electrode (13), the eleventh electrode (14), the twelfth electrode (15), the thirteenth electrode (16), the fourteenth electrode (17), the fifteenth electrode (18), and the sixteenth electrode (19) are applied with the same ac voltage, and the voltage values are-V0 = -sin (ω £ t), wherein the angular frequency values are all ω =16 π rad/s.

In particular to a sawtooth-shaped straight channel micro mixer, the concentration of microfluid injected into the upper layer of an inlet (1) is 1mol/m³The concentration of microfluid injected from the lower layer of the inlet (1) is 0mol/m³The mixed micro-fluid concentration from the outlet (11) of the micro-fluid mixer should be 0.5mol/m³。

Specifically, the length of the micro-mixing channel of the present invention is not limited thereto, and the length thereof can be appropriately shortened or lengthened according to actual needs, so as to correspondingly reduce or increase the length of the whole device, so as to meet the actual separation needs.

Claims

1. A zigzag straight channel micromixer comprises an inlet (1), a micromixer channel (2), a first electrode (3), a second electrode (4), a third electrode (5), a fourth electrode (6), a fifth electrode (7), a sixth electrode (8), a seventh electrode (9), an eighth electrode (10), a ninth electrode (12), a tenth electrode (13), an eleventh electrode (14), a twelfth electrode (15), a thirteenth electrode (16), a fourteenth electrode (17), a fifteenth electrode (18), a sixteenth electrode (19) and an outlet (11); the method is characterized in that: the width of the inlet (1), the width of the micro-mixing channel (2) and the width of the outlet (11) are all 5 micrometers, the micro-mixer is of a symmetrical structure, 16 electrodes are distributed on the convex sawtooth angles along the symmetrical center line in an up-down symmetrical mode, and the included angle of two adjacent electrodes on the same side is 90 degrees.

2. A zigzag straight channel micromixer in accordance with claim 1, wherein: the sawtooth structure is formed by combining single isosceles right triangles, the distance between every two adjacent sawteeth is 4 mu m, and the upper sawteeth and the lower sawteeth are completely the same and symmetrical.

3. A zigzag straight channel micromixer in accordance with claim 1, wherein: 8 electrodes above the micro-mixing channel (2) are all positive voltage, and 8 electrodes below the micro-mixing channel are all negative voltage; the micro-mixing channel (2) is of a rectangular structure and has the length of 50 mu m.