Analysis of flow resistance property for valve-less piezoelectric pump with hemisphere-segment bluff-body

Abstract

Abstract: Based on the principle that the flow resistances on spherical surface and round surface of hemisphere-segment in pump chamber are unequal, a novel valve-less piezoelectric pump with hemisphere-segment bluff-body (HSBB) is presented. The pumping performance depends directly on the flow resistances and their change law on hemisphere-segment surfaces. Therefore, it is necessary to study the flow resistance property of HSBB. This study finds that the forward and reverse flow resistances on HSBB cannot be solved simultaneously by traditional theoretical and experimental hydrodynamics equivalent method for flow resistance around non-sphere. Based on the geometric features of hemisphere-segment the method of Equivalent Flow Resistance Diameter was proposed, and the forward and reverse equivalent spheres respectively corresponding to the spherical and round surface of hemisphere-segment were separated and the sphere diameters were calculated. Flow resistance measuring device was designed, and the flow resistance coefficient of hemisphere-segment was obtained by testing and calculating. The theoretical formulas of forward and reverse flow resistance on hemisphere-segment were established. And through experiments it is verified that the method proposed in this paper is feasible and can be applied to analyze and calculate flow resistance and pumping flow rate in pump. Keywords: valve-less piezoelectric pump, equivalent flow resistance, flow around hemisphere-segment, flow resistance coefficient DOI: 10.33440/j.ijpaa.20210401.149 Citation: Li S D, Zhao W, Ji J, Hu C Q, Hu X Q. Analysis of flow resistance property for valve-less piezoelectric pump with hemisphere-segment bluff-body. Int J Precis Agric Aviat, 2021; 4(1): 14–21.