Bubble swinging micro-mixing system

Abstract

The invention discloses a bubble swinging micro-mixing system, and belongs to the technical field of micro-mixers. In the bubble swinging micro-mixer, gas, liquid a and liquid b form convergent current at a divergent nozzle at an inlet of a main mixing micro-channel. The convergent current forms a bubble sequence under the joint control of the gas-liquid interface tension and viscous shearing force. Periodical alternative temperature rise is generated on a film resistance micro-heater on two sides of the top of the main mixing micro-channel under the excitation of periodically alternating direct current pulse voltage. A periodical reverse temperature gradient is formed in the corresponding width direction of the main mixing micro-channel. An interface tension gradient is resulted from thetemperature gradient. The liquid moves towards a lower temperature side, and bubbles move towards a higher temperature side. The periodical reverse temperature gradient makes the bubbles swing in thechannel width direction at high frequency. Therefore, the mixing between fluid is strengthened. The bubble swinging micro-mixing system can quickly and efficiently realize full mixing of two kinds ofdifferent fluid under micro-scale, and has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of micro-mixing, and in particular relates to a bubble swing micro-mixing system. Background technique [0002] For nearly a century, high-tech fields such as microelectronics technology, information technology, biotechnology, and nanotechnology have made great progress. One of the common development trends of these high-tech technologies is the miniaturization and integration of functions of equipment and systems. With the continuous promotion of micromachining technology, it has become possible to design and manufacture various functional microdevices, microequipment and microsystems. The micro-total analysis system integrates micro-actuators, micro-sensors, micro-mixers, micro-reactors, micro-separators and other components into a chip of a few square centimeters to realize sample delivery, premixing, biochemical reactions, separation and detection And other system functions, with the advantages of less ...

AI Technical Summary

Problems solved by technology

Active micro-mixers need to integrate moving parts inside the micro-mixer, which has the advantage of high mixing efficiency, but its processing technology is complex, and the existence of moving parts leads to reduced reliability; passive micro-mixers use channels with complex geometric structures to form chaotic flow To strengthen fluid mixing, the mixing efficiency is usually lower than that of active mixers, and the complex channel structure will cause increased flow resistance

Therefore, fluid mixing at the microscale has not been well resolved

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