The Optimization And Experimental Research Of Valveless Piezoelectric Pump With Changeable Nozzle/diffuser Elements

In this paper, the research of valveless piezoelectric pump with changeable cone angle nozzle/diffuser elements (CCNDE) is carried out. The whole study is based on the changeability of CCNDE. And the structure of this new concept nozzle/diffuser element is designed and manufactured. Also, the working performance, the hydrodynamics analysis is achieved in the research. It will provide theoretical reference for the minimization and industrialization of valveless piezoelectric pump with nozzle/diffuser elements.The cone angle of nozzle/diffuser elements can be changed from 0 degree to 90 degree, which is realized by designing a structure of changeable cone angle nozzle/diffuser elements. With the cone angle being continuously changed, the experiments of flow rate could be implemented under different frequencies. Moreover, Computational Fluid Dynamics (CFD) analysis of flow field in CCNDE is completed in the research. Besides, it is simulated that the distribution of the velocity, pressure, and flow field type are under experimental conditions. For the sake of observing the occurrence, growing and flowing out phenomenon of the cavitations in the valveless piezoelectric pump with CCNDE, a set of device was developed to achieve the proposed purpose. In addition, a 3-Dimensional mesh was invented to resist the occurrence and flow of cavitations.Comparing to other valveless piezoelectric pumps with nozzle/diffuser elements, the valveless piezoelectric pump with CCNDE has the character that the flow rate can be changed continuously. Also, according to the different materials which are transported through the pump, the proper cone angle can be selected to create the proposed flow field type so that this pump could be applied in some occasions that the turbulence should be avoided. What is more, the invention of 3-Dimensional cavitations resistance method would effectively efface the flowing out of the cavitations in the piezoelectric pump, which would make this pump applied on the field of medical care such as blood transfusion.