Valveless Thermally-Driven Phase-Change Micropump  

作　　者：王沫然 李志信 

机构地区：[1]Department of Engineering Mechanics Tsinghua University, Beijing 100084, China

出　　处：《Tsinghua Science and Technology》2004年第6期688-693,共6页清华大学学报（自然科学版（英文版）

基　　金：SupportedbytheNationalNaturalScienceFoundationofChina(No.59995550-2)NationalKeyBasicResearchandDevelopment(973)ProgramofChina(No.G1999033106)

摘　　要：A dynamic model with moving heat sources was developed to analyze the pumping mechanism of a valveless thermally-driven phase-change micropump. The coupled equations were solved to determine the pumping characteristics. The numerical results agree with experimental data from micropumps with different diameter microtubes. The maximum flow rate reached 33 μL / min and the maximum pump pressure was over 20 kPa for a 200-μm diameter microtube. Analysis of the pumping mechanism shows that the main factors affecting the flow come from the large density difference between the liquid and vapor phases and the choking effect of the vapor region.A dynamic model with moving heat sources was developed to analyze the pumping mechanism of a valveless thermally-driven phase-change micropump. The coupled equations were solved to determine the pumping characteristics. The numerical results agree with experimental data from micropumps with different diameter microtubes. The maximum flow rate reached 33 μL / min and the maximum pump pressure was over 20 kPa for a 200-μm diameter microtube. Analysis of the pumping mechanism shows that the main factors affecting the flow come from the large density difference between the liquid and vapor phases and the choking effect of the vapor region.

关 键 词：valveless MICROPUMP phase change pumping mechanism 

分 类 号：TB12[理学—工程力学]