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A Comparative Study of Nozzle/Diffuser Micropumps with Novel Valves

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Author(s): Kai-Shing Yang | Tzu-Feng Chao | Ing Youn Chen | Chi-Chuan Wang | Jin-Cherng Shyu

Journal: Molecules
ISSN 1420-3049

Volume: 17;
Issue: 2;
Start page: 2178;
Date: 2012;
Original page

Keywords: micro pump | diffusers | nozzles | enhancement | flow rate

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.
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