Cross micromixer of symmetrical fan shaped annular baffle

Abstract

The invention discloses a cross micromixer of a symmetrical fan annular baffle. A cross flow channel and a plurality of sequentially connected mixing units are arranged between a cover plate and a substrate. Each mixing unit is composed of a shrinking flow channel, a narrow direct current channel, a circular arc flow channel and a fan-shaped annular baffle which is located near the outlet of the circular arc flow channel in sequential connection. The outlet of the cross flow channel is connected to and communicated with a first shrinking flow channel inlet, and a last circular arc flow channel is connected to and communicated with the flow channel outlet. A gap is formed between the outer edge of the fan-shaped annular baffle and the inner wall of the circular arc flow channel; concave surfaces of the fan-shaped annular baffle and the circular arc flow channel face each other, and the fan-shaped annular baffle is symmetrical in respect to a central axis. According to the cross micromixer disclosed by the invention, a jet can be formed after a fluid passes the shrinking flow channel and the narrow direct current channel, so that the flow velocity of the fluid is increased; when the fluid passes the fan-shaped annular baffle, jet attached flow is formed on the convex surface of the fan-shaped annular baffle, and secondary flow phenomenon occurs, so that a relatively high mixing effect is achieved under the condition that the flow channel length is relatively short.

Description

technical field [0001] The invention relates to the 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 an import...

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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