Numerical and Experimental Study of Valve-Less Micropump Using Dynamic Multiphysics Model

An investigation for valve-less micropumps based on diffuser/nozzle structure is presented in this paper. The fluid flow characteristics of valve-less micropump are analyzed by dynamic multi-physics FEM simulation model. The simulation results show that the turbulence emerges in the interfacial area of nozzle/chamber is the key for restrict fluid reflux, which resulting unidirectional flow. The pumping efficiency is not only depended on the diffuser/nozzle but also closely related to the entire structure. Besides, the flow rate of micropump is proportional to diffuser/nozzle angle within limits ranges, 5° seems not best value. Finally, the simulation analysis conclusions are verified by experimental results. This research provides a new analysis method for valve-less micropump.