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Novel backflow-type micro mixer

A technology of reflux micro-mixer, which is applied in the field of micro-systems, can solve the problems of low reflux rate and low mixing efficiency, and achieve the effect of increasing reflux rate and mixing rate, improving mixing efficiency, and wide application range

Inactive Publication Date: 2012-07-11
张端 +1
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of low reflux rate and low mixing efficiency of the existing reflux micro-mixer, the present invention provides a new reflux micro-mixer with improved mixing efficiency

Method used

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  • Novel backflow-type micro mixer
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  • Novel backflow-type micro mixer

Examples

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example 1

[0026] Example 1: Use ANSYS software to simulate two different fluids with a density of 1000kg / m 3 、1100kg / m 3 , the diffusion coefficient is 10 -9 m 2 / s. The mixer is modeled in 3D, such as figure 2 As shown, the method used is to analyze the multi-component transport in the FLOTRAN / CFD module in ANSYS. The density and viscosity coefficient change with the occurrence of mixing. It is determined whether reflux occurs by observing the direction of the velocity. By observing the density value after mixing Judgment of mixed conditions.

[0027]Backflow is an important indicator of backflow micro-mixers. Uninterrupted backflow can not only increase the mixing length in a limited space, but also cause fluid oscillation, which plays a positive role in promoting mixing. Due to the difference in the structure and size of the mixer and the difference in external stimuli such as flow rate, it has different effects on the size of the return flow. According to the law of fluid mec...

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PUM

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Abstract

The invention discloses a novel backflow-type micro mixer which comprises a mixing cavity, wherein the mixing cavity is respectively communicated with at least two inlet channels and an outlet channel; the at least two inlet channels are respectively communicated with a primary mixing channel which is of a jet flow structure; the primary mixing channel is communicated with an inlet of the mixing cavity; each of two sides of the inlet of the mixing cavity is provided with an oval annular feedback channel; one end of each oval annular feedback channel is communicated with the upper part of the mixing cavity, and the other end of each oval annular feedback is communicated with the lower part of the mixing cavity; and the outlet of the lower end of the mixing cavity is communicated with the outlet channel. The novel backflow-type micro mixer provided by the utility model is capable of improving the mixing efficiency.

Description

technical field [0001] The invention relates to the field of microsystems, in particular to a micromixer. Background technique [0002] Microfluidic chip technology has moved the biochemical laboratory to micrometer-to-millimeter slices. Due to its small size, the original complicated experimental operations and personnel participation are reduced, and the test tubes and beakers on the experimental bench are replaced by microchannels and reservoirs, which saves reaction raw materials and is suitable for experiments with expensive drugs and toxic reagents. Due to the small amount of reagents involved in the experiment, not only the efficiency of the reaction is improved, the heat transfer is accelerated, and the safety of the experiment is enhanced. However, the micron-scale structure leads to a large increase in the area-to-volume ratio of the fluid, which makes the fluid have special characteristics different from the macroscopic fluid, such as the laminar flow effect that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F13/00B01L3/00
Inventor 张端何熊熊
Owner 张端
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