3D asymmetric division and combination structure passive type micromixer

Abstract

The invention relates to a 3D asymmetric division and combination structure passive type micromixer. According to the 3D asymmetric division and combination structure passive type micromixer, an uppermatrix and a lower matrix are combined firmly; a matrix is provided with a runner through etching; the runner comprises an inlet runner, circular mixing units, an outlet runner, and a straight runner; each circular mixing unit is composed of a large circular runner, a small circular runner, and a straight runner unit; the circular mixing units are arranged between the straight runner and the outlet runner in series; the straight runner and the outlet runner are arranged to be collinear; the annular mixing units are arranged along the axis direction at equal intervals; liquid is introduced into the runner through a runner inlet, separation of mixed flow is induced because of interface abrupt change in entering into the circular mixing units, a part fluid enters into a circular runner, andlaminar flow diffusion states are maintained, and another part fluid flows along the vertical direction, secondary flow and eddy generation, and flow line disturbance are caused because of the abruptreduction of the width when the fluid enters into the circular runner, in fluid separation and combination, collision and extrusion of the two fluid parts are caused because of the convection, so thatfull contact of the two fluid parts is realized.

Description

technical field [0001] The invention relates to the technical field of microfluid mixing in micro-mixing chips and biochips, in particular to a passive micro-mixer with a 3D asymmetric split-and-close structure. Background technique [0002] As an important part of the microfluidic system, the micromixer is widely used in the fields of drug preparation, chemical detection, cosmetic synthesis and other fields due to its fast and efficient mixing performance. Reagents, reducing the risk (such as strong exothermic or toxic reagent reactions). The size of the microchannel in the microfluidic micromixer ranges from tens to hundreds of microns. The fluid in the microchannel is usually in a laminar flow state, and its mixing is mainly achieved by molecular diffusion. For two or more fluids When mixing, it is difficult to fully mix the fluids, so it is very important to achieve efficient and fast mixing of fluids at the microscale. [0003] According to the principle of mixing pro...

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Problems solved by technology

[0004] In the microscopic state, the mixed substances are mainly completed by diffusion, which generally takes a long time, which is not conducive to improving the efficiency of mixing.

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