Study of Bubble Impact on Piezoelectric Micro-pump and Innovative Chamber Design against Bubble
Date Issued
2015
Date
2015
Author(s)
Lin, Jui-Yu
Abstract
This study makes a deep research into the impact of bubble on a bridge-type- check-valves piezoelectric micro-pump and develops an innovative chamber design to enhance its performance against bubble. To find the optimum depth of chamber, the pumping flow-rate, self-priming ability and bubble tolerance at different actuating frequency are tested for six different depth of chambers. The results show that the micro-pump has a maximum flow-rate of 302.1ml/min at 35Hz and a shortest self-priming time at 15Hz with 1.0mm depth of chamber. An infinite bubble tolerance can also be found at both 15Hz and 70Hz. Besides, in order to have a complete understanding of the bubble impact on this kind of pump, different volume of bubbles are injected into the six different depth of chambers to test the flow-rates at different frequency. Based on the principle of that bubble chooses to be in a lower surface-energy state, this innovative chamber design can separate the bubble’s channel from water’s one and avoid bubble influence on the flow of water in the micro-pump. After repeating the above test on the new chamber and comparing with the traditional plane chamber; the impact of bubble on the flow-rate is much reduced and the stability of the micro-pump is enhanced at the same flow-rate and self-priming time too. And, the bubble tolerance of this new kind of chamber is 100% more than the traditional one.
Subjects
bubble
piezoelectric micro-pump
innovative chamber design
depth of chamber
self-priming ability
bubble tolerance
surface energy
Type
thesis
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