Wedge-shaped obstacle passive micro-mixer

Abstract

The utility model discloses a wedge-shaped barrier passive micromixer, and belongs to the technical field of microfluidics. The mixer comprises two fluid inlets, a fluid outlet, a micro-mixer main channel and a wedge-shaped obstacle arranged in the channel, the wedge-shaped obstacle is formed by combining a straight triangular prism and a right-angle triangular prism, the bottom face of the straight triangular prism is an isosceles right triangle, and the inclined face of the wedge-shaped obstacle faces the fluid flowing direction and always faces the central axis of the micro-mixer main channel. And the four side plates are sequentially arranged on the four sides of the rectangular main channel at equal intervals in the clockwise direction. Every four wedge-shaped barriers form a mixing unit and are circularly arranged to a fluid outlet along a main channel of the micro-mixer to form a multi-dimensional vortex, so that the fluid contact area and convective diffusion are increased, and the mixer has efficient and stable mixing performance. The micro-scale fluid mixing device is simple in structure, low in manufacturing cost and suitable for mixing occasions of micro-scale fluid such as micro-fluidic chips and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of micro total analysis and microfluidic technology, and discloses a wedge-shaped obstacle passive micro-mixer based on the obstacle mixing principle and fluid mixing mechanism, which is used for accelerating fluid mixing at a micro scale. BACKGROUND

[0002] Due to low cost, small dosage of drugs and high analysis efficiency, the microfluidic chip has been widely used in the research fields of biomedicine, clinical diagnosis and treatment, drug synthesis and the like. The micro-mixer is an important component of the microfluidic device, and has considerable influence on the efficiency and sensitivity of the device. The micro-mixer used in the microfluidic system can be divided into an active micro-mixer and a passive micro-mixer. The active micro-mixer has high complexity of the device and system and causes adverse effects on samples or organisms due to energy driving, and the experimental results are not accurate. At present, most of the passive micro-mixers are used to generate vortex or secondary flow to enhance mixing by generating transverse material transportation of fluid, but the vortex or secondary flow generated by them usually exists in one dimension, which leads to insufficient chaotic convection in the micro-channel and limited improvement of the mixing effect.

[0003] In order to develop a passive micro-mixer with high mixing efficiency and low price, the present application is improved based on the existing research, and a wedge-shaped obstacle passive micro-mixer is designed. The microfluid is generated to generate multi-dimensional vortex in the whole micro-channel by continuously circulating the wedge-shaped obstacles on the four edges of the rectangular channel until the outlet of the micro-channel, so as to increase the contact area and convection diffusion between two fluids and significantly enhance the mixing performance of the micro-mixer. SUMMARY

[0004] The present application discloses a wedge-shaped obstacle passive micro-mixer based on the structure of a T-shaped micro-mixer, and the components of the micro-mixer include:

[0005] Two fluid inlets (1) and one fluid outlet (2);

[0006] The size and structure of the main channel (3) of the micro-mixer are used for guiding the flow of liquid;

[0007] The wedge-shaped obstacles (4) arranged in the micro-channel;

[0008] The wedge-shaped obstacles (4) are regularly distributed according to specific positions and directions.

[0009] The wedge-shaped obstacle passive micro-mixer comprises two fluid inlets (1), one fluid outlet (2), a micro-mixer main channel (3) for guiding liquid flow, and a wedge-shaped obstacle (4) arranged in the micro-channel, which is composed of a straight triangular prism with an isosceles right triangle as the bottom surface and a right triangular prism in combination, and the trapezoidal surface of the combination body is in effective engagement with the micro-mixer main channel (3).

[0010] The inclined surface (5) of the wedge-shaped obstacle faces the fluid flow direction and always points to the central axis of the micro-channel (3), which can effectively control the fluid velocity and direction, and the wedge-shaped obstacles (4) are arranged equidistantly in the clockwise direction on the four edges of the micro-mixer rectangular channel (3).

[0011] Four wedge-shaped obstacles (4) form a mixing unit (6), and the wedge-shaped obstacles (4) are placed in a circulating manner on the four edges of the main channel (3) until the outlet of the micro-channel, achieving high-efficiency mixing.

[0012] Working process

[0013] The working principle of the present application is that two different component fluids flow into the micro-mixer from two fluid inlets (1), meet and contact in the micro-channel (3) and begin preliminary mixing. Then the fluid enters the main channel and encounters a series of designed wedge-shaped obstacles (4) in the channel. These wedge-shaped obstacles (4) disturb the fluid flow, causing the micro-fluid to form high-intensity chaotic convection on multiple dimensions in the mixing channel (3), thereby significantly improving the mixing efficiency of the micro-mixer. The structure of the wedge-shaped obstacle (4) is shown in Figure 2 which is composed of a straight triangular prism with an isosceles right triangle as the bottom surface and a right triangular prism in combination, and the micro-mixer is composed of two fluid inlets (1) and one fluid outlet (2), the fluid inlets (1), the fluid outlet (2) and the main channel of the channel all have a square cross section, the inlets on both sides of the main channel are symmetrically distributed,

[0014] In the micro-channel (3), the inclined surface of the wedge-shaped obstacle (4) faces the fluid flow direction and always points to the central axis of the micro-channel (3), effectively controlling the speed and direction of fluid flow. The wedge-shaped obstacles (4) are arranged in the clockwise direction on the four edges of the micro-mixer rectangular channel (3), and each wedge-shaped obstacle (4) produces a specific disturbance effect on the fluid. Four wedge-shaped obstacles (4) jointly form a group of mixing units, which are continuously placed in a circulating manner to the fluid outlet (2) of the micro-channel, so that the vortex continuously circulates in the entire micro-channel (3), increasing the contact area and convective diffusion between the two fluids, and significantly improving the mixing efficiency. After several such circulating mixing units, the fluid flows out of the fluid outlet (2) of the micro-mixer, completing the mixing process.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Schematic diagram of the micro-mixer structure provided for the present application

[0016] Figure 2 Partial view of the wedge-shaped obstacles and mixing units provided for the present application

[0017] Legend: 1 - inlet; 2 - outlet; 3 - microchannel; 4 - wedge-shaped obstacle; 5 - wedge-shaped obstacle slope; 6 - mixing unit EMBODIMENT

[0018] The present application will be further described in connection with the accompanying drawings and the application of the asymmetric split recombination sectoral cavity micro-mixer in microfluidic preparation:

[0019] The micro-mixer design allows two different fluids to enter the device through two separate fluid inlets (1), meet in the microchannel (3) and start their initial mixing process. The fluids then flow into the main channel, where they encounter a series of clockwise specifically ordered wedge-shaped obstacles (4). These obstacles (4) create three-dimensional high-intensity chaotic convection in the microfluidic channel (3) by disturbing the fluid flow, greatly improving the mixing efficiency. The structure of the wedge-shaped obstacles (4) is composed of an equilateral right triangle base, a straight triangular prism and a right triangular pyramid, as shown in the Figure 2 The micro-mixer contains two fluid inlets (1) and a single fluid outlet (2), all channels have a square cross-section, and the inlets on both sides of the main channel are symmetrically arranged.

[0020] In the microchannel (3), the slope of the wedge-shaped obstacle (4) is opposite to the direction of fluid flow, always pointing to the central axis of the microchannel (3), effectively controlling the flow rate and direction of the fluid. The wedge-shaped obstacles (4) are arranged in a clockwise direction along the edges of the rectangular channel (3) of the micro-mixer, and each wedge-shaped obstacle (4) exerts a specific disturbance on the fluid. The synergistic effect of every four consecutive wedge-shaped obstacles (4) forms a mixing unit, which ensures the continuous circulation of vortices in the entire channel by continuously circulating in the microchannel (3) until reaching the fluid outlet (2). This process increases the contact area and convective diffusion between the two fluids, significantly improving the mixing efficiency. After several such cycle mixing units, the mixed uniform fluid flows out of the micro-mixer fluid outlet (2), completing the entire mixing process.

Claims

1. A passive micro-mixer with wedge-shaped obstacles, based on the structure of a T-shaped micro-mixer, comprising: two fluid inlets (1) one fluid outlet (2); a micro-mixer main channel (3) structure for guiding liquid flow; characterized in that a wedge-shaped obstacle (4) is placed in the micro-channel, the wedge-shaped obstacle is composed of a straight triangular prism with an isosceles right triangle as its base and a right triangular prism, the inclined surface (5) faces the fluid flow direction and always points to the central axis of the micro-mixer main channel (3); the wedge-shaped obstacles are arranged equidistantly in the clockwise direction on the four sides of the micro-mixer main channel (3); four wedge-shaped obstacles form a mixing unit (6), which is arranged in a cycle along the micro-mixer main channel (3) until the fluid outlet (2) to form multi-dimensional vortex and enhance the fluid mixing effect.

2. The passive micro-mixer with wedge-shaped obstacles according to claim 1, characterized in that: The micro-mixer has two identical and symmetrically distributed feed ports perpendicular to the axis of the micro-mixer main channel (3), and the fluid inlet (1) is designed to receive two fluids to be mixed; the fluid inlet (1) and fluid outlet (2) of the micro-channel and the main channel are square with equal width, and the inlets on both sides of the micro-mixer main channel (3) are symmetrically distributed.

3. The passive micro-mixer with wedge-shaped obstacles according to claim 1, characterized in that: The wedge-shaped obstacle (4) is formed by combining a straight triangular prism with an isosceles right triangle as its base and a right triangular prism; In the structure of the wedge-shaped obstacle (4), the trapezoidal surface of the combined body is combined with the micro-mixer main channel (3).

4. The passive micro-mixer with wedge-shaped obstacles according to claim 1, characterized in that: The inclined surface (5) of the wedge-shaped obstacle (4) faces the fluid and always points to the central axis of the micro-channel, and the wedge-shaped obstacles are arranged equidistantly in the clockwise direction on the four sides of the micro-mixer main channel (3).

5. The passive micro-mixer with wedge-shaped obstacles according to claim 1 or 2, characterized in that: Four wedge-shaped obstacles (4) form a mixing unit (6), and the wedge-shaped obstacles (4) are placed in a cycle on the four sides of the micro-mixer main channel (3) until the outlet of the micro-channel.

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