The Numerical Analysis and Simulation of Ni-Ti/Si Shape Memory Alloy Micro Valveless Pump

Abstract

In this paper, the characteristics of shape memory alloy (SMA) valveless micro-pump and its work principles are introduced at first. Based on the flow property of diffusion and shrinkage elements, the theory analysis is developed for a valveless micropump, and the flow distribution and pressure variation curve are then achieved with Matlab. Meanwhile, the finite model of the valveless micropump is built by using the ANSYS/FLOTRAN CFD finite element software, and coupled-field simulation analysis is carried out. The effects of different geometry parameters of diffusion and shrinkage elements on the pump performance are simulated and analyzed. The results show the valveless micropump working principle is mainly based on the flow difference of diffusion and shrinkage elements and its output characteristics are related to the geometry parameters. These results are helpful to design the optimal valveless micropump.