无阀微泵损失系数及整流效率  

Loss coefficient and rectification efficiency based on valveless micropump

作　　者：应济[1] 曹超[1] 焦致凯[1] 

机构地区：[1]浙江大学机械工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2013年第2期249-255,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50475104);浙江省自然科学基金重点资助项目(Z106519)

摘　　要：为了得到适于无阀微泵所处低雷诺数层流条件下的总压/压强损失理论,对扩张/收缩管组件各部分进行优化设计.由能量耗散和压强降低原理,建立无阀微泵的总压以及压强损失理论;利用有限元软件,建立扩张/收缩管组件的有限元模型,进行流场仿真分析;分析驱动压强,扩张角对扩张/收缩管组件总压/压强损失以及整流效率的影响.仿真结果显示:扩张/收缩管组件各部分总压损失均不可忽略;当无量纲压力pw大于6.4×104时,出口段的压强损失可以认为是0;总损失系数随扩张角以及驱动压强的增大而减小;当pw小于4.48×104时,扩张角越大微泵整流效率越高;而当pw大于19.2×104时,扩张角越小微泵整流效率越高.To get the proper total pressure/pressure loss theory of valveless micropump in the case of low reynolds laminar flow and make optimal design for each part of diffuser/nozzle component. Based on the principle of energy dissipation and pressure loss, the total pressure/pressure loss theory of valveless micropump was established. The finite element model of diffuser/nozzle component was built by using the finite element software and the flow simulation analysis was carried out. The effects of driven pressure, divergence angle on total pressure/pressure loss and rectification efficiency of diffuser/nozzle component was analyzed. The simulation results show that： the total pressure loss of each part of diffuser/nozzle component can not be ignored. When the dimensionless pressure Pw greater then 6.4 × 104 , the pressure loss of exit section can be regarded as 0. The total loss coefficient decrease with the increase of divergence angle and driven pressure. When Pw less then 4.48 ×104 , the larger divergence angle micropump have better rectification efficiency, while Pw great then 19.2 ×104 , the smaller divergence angle micropump have better rectification efficiency.

关 键 词：无阀微泵 低雷诺数层流 总压损失 压强损失 数值模拟 

分 类 号：TH38[机械工程—机械制造及自动化]