Device and method for controlling volume flow of power-law fluid in microchannel

Abstract

The invention discloses a device and method for controlling the volume flow of a power-law fluid in a microchannel. The power-law fluid contacts the solid wall surface of the microchannel, and the solid surface can acquire electric charge because of specific physical and chemical reactions. The electric charge on the microchannel solid surface can affect the distribution of ions in the power-law fluid and form an electrical double layer in the power-law fluid near the wall surface. Under the action of an external electric field, the power-law fluid in the electrical double layer produces electroosmotic flow. By solving a control equation for the flow of the power-law fluid in the microchannel, the velocity distribution of electroosmotic flow in the microchannel can be obtained, and then the volume flow of the power-law fluid in the microchannel can be worked out. By adjusting the voltage, precise regulation of the volume flow of the power-law fluid in the microchannel can be realized.An electric field is added at both ends of the microchannel, and under the action of the electric field, the power-law fluid is driven to move in the microchannel. The device has a simple structure and no rotating part, and reduces vibration and noise.

Description

【Technical field】 [0001] The invention belongs to the technical field of microfluidics, and in particular relates to a device and a method for controlling the volumetric flow rate of a power-law fluid in a microchannel. 【Background technique】 [0002] With the rapid development of social production, while the requirements for equipment performance have increased dramatically, the miniaturization of equipment is also required; in this case, microfluidic technology has emerged as the times require. Microfluidic technology has important applications in the fields of integrated circuit cooling, biochemical analysis systems, drug testing, and new energy; in these important applications, how to precisely control the transport of fluids in microchannels is a common key issue. The current expansion of practical applications has led to an increasingly obvious trend of using non-Newtonian fluids as working fluids. For example, lab-on-a-chip based on microfluidic technology is mainly u...

AI Technical Summary

Problems solved by technology

Although the traditional fluid control technology based on pumps and valves has achieved certain applications in the field of microfluidics, it has many shortcomings and is inconvenient for popularization and application.

For example, due to the strict limitation of space in microfluidic applications, the arrangement of traditional pumps and valves is very inconvenient; in addition, traditional pumps have rotating parts, which are noisy and have poor flow stability, making it difficult to achieve precise control of fluid flow; finally, traditional The driving force of the pump comes from the pressure difference, and the driving efficiency is low in micro-nano channels

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