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Proceedings Paper

Study on the characteristics of microfluidic oscillator based on a new type of normally closed valve structure
Author(s): Rui Zhao; Dong Yu; Le Zhang; Mei Mei Kong; Zhong Cheng Liang
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Paper Abstract

This article introduced a new type of normally closed micro-valve (NCV) equipped with curved channels and trapezia-shaped valve seat, which could solve the issues of large area of dead zone, high threshold pressure and slow response speed of NCV in the current microfluidic oscillators. The new type of NCV has a three-layered structure with a top controlling layer, medium membrane layer and the bottom feedback layer. The membrane channel in the feedback layer is specifically deigned as curved to decrease the dead zone area. The valve seat is designed as a trapezoid to reduce the adhesion between the membrane and the valve seat and the threshold pressure of the NCV , and to improve the response speed of the system .The results of simulation study on COMSOL shows that this micro-valve structure reduces the NCV threshold pressure by 45% and the oscillation period of the micro-oscillator by 36%. This article conducted further simulation studies on the factors that influence the oscillation period of micro-oscillator. When enlarging inlet flow rate of micro-oscillator, lowering NCV threshold pressure and decreasing valve seat angle, the oscillation period would be reduced. Otherwise, the oscillation period will be increased.

Paper Details

Date Published: 10 January 2018
PDF: 7 pages
Proc. SPIE 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications, 106180I (10 January 2018); doi: 10.1117/12.2295179
Show Author Affiliations
Rui Zhao, Nanjing Univ. of Posts and Telecommunications (China)
Dong Yu, Nanjing Univ. of Posts and Telecommunications (China)
Le Zhang, Nanjing Univ. of Posts and Telecommunications (China)
Mei Mei Kong, Nanjing Univ. of Posts and Telecommunications (China)
Zhong Cheng Liang, Nanjing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 10618:
2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications
Xuping Zhang; Hai Xiao; Francisco Javier Arregui; Liquan Dong, Editor(s)

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