A Cross Micromixer with Symmetrical Elliptical Arc Baffles

Abstract

The invention discloses a cross micromixer with symmetrical elliptic-arc-shaped baffles. The cross micromixer comprises a channel outlet, a cover plate and a base body, wherein a cross type flow channel, a contracting channel and a plurality of mixing units are arranged between the cover plate and the base body; each of the mixing units comprises a narrow straight channel, an elliptical channel and an elliptic-arc-shaped baffle arranged in the elliptical channel; the plurality of mixing units are connected in series between the contracting channel and the channel outlet; the outlet of the cross type flow channel is connected and communicated with the inlet of the contracting channel; the concave surfaces of the elliptic-arc-shaped baffles face right against the inlets of the elliptical channels; the convex surfaces of the elliptic-arc-shaped baffles are tangent to the short axes of the elliptical channels; gaps are formed between the arc angle outer edges of the elliptic-arc-shaped baffles and the inner walls of the elliptical channels, therefore the fluid can form jet flow after flowing through narrow straight channels, and the jet flow impacts the elliptic-arc-shaped baffles to form convective flow with incoming flow, disturbance between the fluids can be increased, and besides, when the fluid flows through the elliptic-arc-shaped baffles, jet attached flow is formed on the convex surfaces of the elliptic-arc-shaped baffles, and the mixing intensity among different liquids can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of liquid micro-mixing in biochips and micro-total analysis systems, in particular to a passive micro-mixer based on separation and recombination and wall attachment effects, which realizes rapid mixing of different liquids at a micro scale. Background technique [0002] The microfluidic system is an important part of the microelectromechanical system. The microfluidic system is an important branch of the microfluidic system. It can realize the separation, addition, mixing, reaction, monitoring and other functions of the traditional biochemical monitoring process on the chip. . As an important part of microfluidic systems, micromixers are increasingly used in bioanalysis, chemical synthesis, drug screening and clinical testing due to their efficient and rapid mixing performance. For the chemical reaction of two or more fluids, the problem of effective mixing between them must be solved, so the micromixer is...

AI Technical Summary

Problems solved by technology

[0004] At present, the size of the microchannel in the microfluidic mixer is in the range of tens to hundreds of microns, the Reynolds number of the liquid in the microchannel is so small that no eddy current is generated, and the mixing between liquids is dominated by molecular diffusion, making Compared with the macro situation, the mixing time is greatly prolonged and the mixing effect is poor, so special methods must be adopted to increase the contact area between liquids or enhance convection to improve mixing efficiency

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