Molecules 2012, 17(2), 2178-2187; doi:10.3390/molecules17022178

A Comparative Study of Nozzle/Diffuser Micropumps with Novel Valves

1 Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan 2 Department of Mechanical Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan 3 Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan 4 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
(This article belongs to the Special Issue Flow Chemistry)
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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.

AMA Style

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.

Chicago/Turabian Style

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.

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