【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.更多还原

【Abstract】 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.更多还原