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Improvements in Fixed-Valve Micropump Performance Through Shape Optimization of Valves

机译:通过阀的形状优化来改善固定阀微型泵的性能

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The fixed-geometry valve micropump is a seemingly simple device in which the interaction between mechanical, electrical, and fluidic components produces a maximum output near resonance. This type of pump offers advantages such as scalability durability, and ease of fabrication in a vanely of materials. Our past work focused on the developmentof a linear dynamic model for pump design based on maximizing resonance, while little has been done to improve valve shape. Here we present a method for optimizing valve shape using two-dimensional computational fluid dynamics in conjunction with an optimization procedure. A Tesla-type valve was optimized using a set of six independent,non-dimensional geometric design variables. The result was a 25percent higher ratio of reverse to forward flow resistance (diodicity) averaged over the Reynolds number range 0 < Re <= 2000 compared to calculated values for an empirically designed, commonly used Tesla-type valve shape. The optimized shape was realized with no increase in forward flow resistance. A linear dynamic model, modified to include a number of effects that limit pump peformance such as cavitation, was used to design pumps based on the new valve. Prototype plastic pumps were fabricated and tested. Steady-flow tests verfied the predicted improvement in diodicity. More importantly, the modest increase in diodicity resulted in measured block-load pressure and no-load flow three times higher compared to an identical pump with non-optimized valves. The large performance increase observed demonstrated the importance of valve shape optimization in the overall design process for fixed-valve micropumps.
机译:固定几何形状的阀门微型泵是一种看似简单的设备,其中机械,电气和流体组件之间的相互作用在共振附近产生了最大的输出。这种类型的泵具有诸如可扩展性的耐用性以及易于在多种材料中制造的优点。我们过去的工作集中在基于最大化共振的泵设计线性动力学模型的开发上,而对于改善阀的形状却做得很少。在这里,我们提出了一种使用二维计算流体动力学结合优化程序来优化阀门形状的方法。使用一组六个独立的无量纲几何设计变量对Tesla型阀门进行了优化。结果是,与经验设计的常用特斯拉型阀形状的计算值相比,在雷诺数范围0

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