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Theoretical analysis and experimental verification on valve-less piezoelectric pump with hemisphere-segment bluff-body

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Abstract

Existing researches on no-moving part valves in valve-less piezoelectric pumps mainly concentrate on pipeline valves and chamber bottom valves, which leads to the complex structure and manufacturing process of pump channel and chamber bottom. Furthermore, position fixed valves with respect to the inlet and outlet also makes the adjustability and controllability of flow rate worse. In order to overcome these shortcomings, this paper puts forward a novel implantable structure of valve-less piezoelectric pump with hemisphere-segments in the pump chamber. Based on the theory of flow around bluff-body, the flow resistance on the spherical and round surface of hemisphere-segment is different when fluid flows through, and the macroscopic flow resistance differences thus formed are also different. A novel valve-less piezoelectric pump with hemisphere-segment bluff-body (HSBB) is presented and designed. HSBB is the no-moving part valve. By the method of volume and momentum comparison, the stress on the bluff-body in the pump chamber is analyzed. The essential reason of unidirectional fluid pumping is expounded, and the flow rate formula is obtained. To verify the theory, a prototype is produced. By using the prototype, experimental research on the relationship between flow rate, pressure difference, voltage, and frequency has been carried out, which proves the correctness of the above theory. This prototype has six hemisphere-segments in the chamber filled with water, and the effective diameter of the piezoelectric bimorph is 30mm. The experiment result shows that the flow rate can reach 0.50 mL/s at the frequency of 6 Hz and the voltage of 110 V. Besides, the pressure difference can reach 26.2 mm H2O at the frequency of 6 Hz and the voltage of 160 V. This research proposes a valve-less piezoelectric pump with hemisphere-segment bluff-body, and its validity and feasibility is verified through theoretical analysis and experiment.

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Correspondence to Jianhui Zhang.

Additional information

Supported by National Natural Science Foundation of China (Grant No. 51375227), Major Research Plan of National Natural Science Foundation of China (Grant No. 91223201), and Independent Projects Fund of State Key Lab of Mechanics and Control of Mechanical Structures of China (Grant No. 0313G01)

JI Jing, born in 1974, is currently a PhD candidate at State key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, China. Her research area is mechanical design and its theory.

ZHANG Jianhui, born in 1963, is currently a professor and a PhD candidate supervisor at State key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, China. His research area is mechanical design and its theory, piezoelectric driving.

XIA Qixiao, born in 1964, is currently an associate researcher and a master supervisor at College of Mechanical & Electronic Engineering, Beijing Union University, China. His research area is mechanical design and its theory.

WANG Shouyin, born in 1956, is currently a researcher at Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, China. His research area is photoelectric measurement.

HUANG Jun, born in 1981, is currently a PhD candidate at State key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, China. His research area is fluid machinery and its coupling analysis, piezoelectric driving.

ZHAO Chunsheng, born in 1937, academician of Chinese Academy of Sciences, is currently a professor and a PhD candidate supervisor at State key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, China. His main research interests include vibration engineering and vibration utilization engineering.

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Ji, J., Zhang, J., Xia, Q. et al. Theoretical analysis and experimental verification on valve-less piezoelectric pump with hemisphere-segment bluff-body. Chin. J. Mech. Eng. 27, 595–605 (2014). https://doi.org/10.3901/CJME.2014.03.595

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  • DOI: https://doi.org/10.3901/CJME.2014.03.595

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