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A Comparative Study of Nozzle/Diffuser Micropumps with Novel Valves
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan
Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan
* Author to whom correspondence should be addressed.
Received: 16 December 2011; in revised form: 16 February 2012 / Accepted: 17 February 2012 / Published: 22 February 2012
Abstract: This study conducts an experimental study concerning the improvement of nozzle/diffuser micropump design using some novel no-moving-part valves. A total of three micropumps, including two enhancement structures having two-fin or obstacle structure and one conventional micro nozzle/diffuser design, are made and tested in this study. It is found that dramatic increase of the pressure drops across the designed micro nozzles/diffusers are seen when the obstacle or fin structure is added. The resultant maximum flow rates are 47.07 mm3/s and 53.39 mm3/s, respectively, for the conventional micro nozzle/diffuser and the added two-fin structure in micro nozzle/diffuser operated at a frequency of 400 Hz. Yet the mass flow rate for two-fin design surpasses that of conventional one when the frequency is below 425 Hz but the trend is reversed with a further increase of frequency. This is because the maximum efficiency ratio improvement for added two-fin is appreciably higher than the other design at a lower operating frequency. In the meantime, despite the efficiency ratio of the obstacle structure also reveals a similar trend as that of two-fin design, its significant pressure drop (flow resistance) had offset its superiority at low operating frequency, thereby leading to a lesser flow rate throughout the test range.
Keywords: micro pump; diffusers; nozzles; enhancement; flow rate
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MDPI and ACS Style
Yang, K.-S.; Chao, T.-F.; Chen, I.Y.; Wang, C.-C.; Shyu, J.-C. A Comparative Study of Nozzle/Diffuser Micropumps with Novel Valves. Molecules 2012, 17, 2178-2187.
Yang K-S, Chao T-F, Chen IY, Wang C-C, Shyu J-C. A Comparative Study of Nozzle/Diffuser Micropumps with Novel Valves. Molecules. 2012; 17(2):2178-2187.
Yang, Kai-Shing; Chao, Tzu-Feng; Chen, Ing Youn; Wang, Chi-Chuan; Shyu, Jin-Cherng. 2012. "A Comparative Study of Nozzle/Diffuser Micropumps with Novel Valves." Molecules 17, no. 2: 2178-2187.