Experimental investigation on phase transformation type micropump
Experimental investigation on phase transformation type micropump作者机构：Tsing Hua Univ Dept Engn Mech Beijing 100084 Peoples R China
出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)
年 卷 期：2002年第47卷第6期
页 面：518-522页
核心收录：
基 金：This work was supported by the National Natural Science Foundation of China (Grant No. 59995550-2) the National Key Project of Fundamental R&D of China (Grant No. 1999033106)
主 题：micropump phase transformation pumping character-istic.
摘 要：The phase transformation type micropump without moving parts was experimentally studied in this note. To analyze the pumping mechanism of the micropump, a simplified physical model was presented. The experimental results indicate that the pump characteristic is mainly dependent on the heating and cooling conditions. For a given system, there exist an optimal combination of heating current and switch time with which the flow rate reaches maximum. Comparing with the natural cooling, the forced con-vective cooling needs larger heating current to obtain the same flow rate. In our experiments, the maximum flow rate is 33μL/min when the inner diameter of the micropump is 200μm, and the maximum pumping pressure reaches over 20 kPa. The theoretical analysis shows that the pumping mechanism of the micropump mainly lies in the large density difference between liquid and gas phases and the effect of gas chocking.
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