Split and recombined passive micromixer with bridge-type structure

Abstract

The invention discloses a split and recombined passive micromixer with a bridge-type structure, belonging to the technical field of micro-fluidic chips. The micromixer mainly comprises a plurality of mixing units 43 which are located between an inlet and an outlet, wherein each mixing unit 43 is composed of a square-wave-shaped channel 44 located in a lower-layer plane and a bridge-type structural channel 45 located outside the plane; each bridge-type structural channel 45 comprises two interlayer through holes 45a and an upper-layer inclined channel 45b. The split and recombined passive micromixer has the beneficial effects: due to the existence of the interlayer through holes 45a and the bridge-type structural channel 45, a fluid is split into branch fluids and then the branch fluids are remixed in a mixing region 47 when the fluid reaches a split region 46 of each mixing unit 43, and vertical and horizontal interfaces are simultaneously generated in the process to form a T-shaped fluid interface, so that the contact area between two kinds of fluids is greatly increased; the fluid flows in a bent three-dimensional channel, and secondary flow disturbance can also be generated at each corner, so that the chaotic advection effect is enhanced, and furthermore, the mixing effect is enhanced.

Description

technical field [0001] The invention relates to a passive micromixer (Micromixer) integrated in a microfluidic chip and suitable for microfluidic mixing, belonging to the field of microfluidics. Background technique [0002] In the past ten years, the research on the application of microfluidic chips has advanced by leaps and bounds. Microfluidic chip, also known as lab-on-a-chip, integrates basic operation units such as sample preparation, reaction, separation, and detection on a chip of a few square centimeters (or even smaller), to complete various tasks in conventional chemical or biological laboratories. A technology platform with functionalities. Most of the functions of microfluidic chips are related to biochemical reactions, and sufficient mixing is an important prerequisite for realizing device functions. The typical characteristic of micro-scale flow is that (Reynolds number, Re) is very low. If there is no strong external disturbance, the flow will maintain a la...

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Problems solved by technology

[0010] In order to overcome the shortcomings of the existing 3D micro-mixer that cannot effectively mix part of the fluid near the side wall of the channel, and its effective working Reynolds number range is very limited, the present invention proposes a SAR micro-mixer with a bridge structure

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