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

A Comparative Study of Nozzle/Diffuser Micropumps with Novel Valves

1
, 2
, 2
, 3,*  and 4
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 micro pump; diffusers; nozzles; enhancement; flow rate
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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