Ultrasonic micro mixer with millisecond mixing performance

Abstract

The invention discloses an ultrasonic micro-mixer with millisecond mixing performance, which comprises a micro-mixer, an ultrasonic transducer and an ultrasonic generator, and the micro-mixer is directly coupled and rigidly connected with the ultrasonic transducer. The wavelength of sound waves in air corresponding to the working frequency of the ultrasonic transducer is 4-68 times of the hydraulics diameter of the microchannel in the micromixer. Vigorous and highly-controllable ultrasonic cavitation is generated in the micro-channel through matching of the hydraulic diameter of the micro-channel and the wavelength of sound waves, the density of cavitation bubbles can reach one cavitation bubble per cubic millimeter, a large number of cavitation bubbles generated in the micro-channel rapidly stir fluid like a stirrer, millisecond-level mixing in the micro-channel is achieved, and the micro-channel is formed. The shortest mixing time can reach 0.2 ms. The problems that in the prior art, under the conditions of low flow and low Reynolds number, millisecond-level mixing cannot be achieved, and channels are prone to being blocked are solved.

Description

technical field [0001] The invention relates to the field of micro-mixer devices, in particular to an ultrasonic micro-mixer device enhanced by ultrasonic waves. Background technique [0002] The mixing effect determines the product quality of some mixing-sensitive processes, such as the preparation of nanomaterials by precipitation. The mixing intensity determines the particle size and distribution of the final nanomaterial, which further affects the final performance of the product. The polymer self-assembly time in the precipitation method is in the order of 20-60 milliseconds (Physical Review Letters, 2003, 91(11): 118302.), the mixing of the fluid must be fast enough to make the mixing time less than the nucleation time, so as to ensure the formation of The nanoparticles are small and uniform in size. For this type of process, we need mixers with mixing times on the order of milliseconds. [0003] Micro-mixers have the advantages of small size, precise control of flui...

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Problems solved by technology

[0005] The object of the present invention is to provide an ultrasonic micro-mixer, aiming at overcoming the above-mentioned problems in the prior art that the millisecond-level mixing cannot be achieved under the condition of low flow and low Reynolds number and the channel is easy to be blocked

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