Simulation of the fluidic features for diffuser/nozzle involved in a PZT-based valveless micropump  

作　　者：HouWensheng Zheng Xiaolin Biswajit Das Jiang Yingtao Qian Shizhi Wu Xiaoying Zheng Zhigao 

机构地区：[1]Department of Biomedical Engineering, Chongqing University, Chongqing 400044, China [2]Nevada Nanotechnology Center, University of Nevada, Las Vegas, NV 89154, USA [3]Department of Electrical and Computer Engineering, University of Nevada, Las Vegas, NV 89154, USA [4]Department of Mechanical Engineering, University of Nevada, Las Vegas, NV 89154, USA

出　　处：《仪器仪表学报》2008年第1期1-4,共4页Chinese Journal of Scientific Instrument

基　　金：Supported by′111′Project and Chongqing Natural Science Foundation(2006BB2043,2006BB2142)

摘　　要：PZT-based valveless micropump is a microactuator that can be used for controlling and delivering tiny amounts of fluids,and diffuser/nozzle plays an important role when this type of micropump drives the fluid flowing along a specific direction.In this paper,a numerical model of micropump has been proposed,and the fluidic properties of diffuser/nozzle have been simulated with ANSYS.With the method of finite-element analysis,the increased pressure drop between inlet and outlet of diffuser/nozzle induces the increment of flow rate in both diffuser and nozzle simultaneously,but the increasing rate of diffuser is faster than that of nozzle.The L/R,ratio of L(length of cone pipe) and R(radius of minimal cross section of cone pipe) plays an important role in fluidic performance of diffuser and nozzle as well,and the mean flow rate will decrease with increment of L/R.The mean flow rate reaches its peak value when L/R with the value of 10 regardless the divergence angle of diffuser or nozzle.The simulation results indicate that the fluidic properties of diffuser/nozzle can be defined by its geometric structure,and accordingly determine the efficiency of micropump.PZT-based valveless micropump is a microactuator that can be used for controlling and delivering tiny amounts of fluids, and diffuser/nozzle plays an important role when this type of micropump drives the fluid flowing along a specific direction. In this paper, a numerical model of micropump has been proposed, and the fluidic properties of diffuser/nozzle have been simulated with ANSYS. With the method of finite-element analysis, the increased pressure drop between inlet and outlet of diffuser/nozzle induces the increment of flow rate in both diffuser and nozzle simultaneously, but the increasing rate of diffuser is faster than that of nozzle. The L/R, ratio of L（length of cone pipe） and R （radius of minimal cross section of cone pipe） plays an important role in fluidic performance of diffuser and nozzle as well, and the mean flow rate will decrease with increment of L/R. The mean flow rate reaches its peak value when L/R with the value of 10 regardless the divergence angle of diffuser or nozzle. The simulation results in-dicate that the fluidic properties of diffuser/nozzle can be defined by its geometric structure, and accordingly determine the efficiency of micropump.

关 键 词：流体系统 模拟 无阀微型泵 散流器 喷嘴 

分 类 号：TH3[机械工程—机械制造及自动化]