Abstract
In order to improve the performances of microfluidic actuators, a microfluidic actuating way based on the shape memory alloy(SMA) is presented, which is applied for the liquids circulation of a microfluidic colour-changing system. A SMA spring is used as the main actuating part, a microfluidic actuating device based on the SMA spring is designed and fabricated. The models for the SMA spring and the whole SMA actuated microfluidic system are established, the experimental platform is built. The temperature properties, output displacement performances and pressure responses of the present system are simulated and tested under different experimental conditions. Comparing with traditional microfluidic actuating systems, the SMA actuated microfluidic colour-changing system is driven by using DC power, small in size, convenient in operation, and has fast response speed and high reliability.
Highlights
In order to improve the performances of microfluidic actuators
actuating way based on the shape memory alloy
which is applied for the liquids circulation
Summary
本文以 SMA 弹簧为主要驱动元件,提出一种基 于 SMA 弹簧的微流体驱动方式,用于实现微流控 PDMS 变色薄膜内液体的双程驱动。 建立 了 SMA 驱动弹簧及整个 SMA 驱动微流控变色系统的数学 模型,对系统特性进行了仿真分析和试验研究。 与 现有的 SMA 薄膜驱动方式相比,该驱动装置无需交 变电流信号,采用直流电源驱动,体积小,便于集成 化,系统输出位移较大,驱动速度较快,且操作便捷, 能够更好地满足本文中微流控光学变色系统驱动性 能的要求。 中马氏体百分含量;ξs 为 SMA 弹簧相变中应力诱发 的马氏体百分含量;E(ξ) 为 SMA 弹簧的弹性模量; Ω(ξ) 为 SMA 弹簧的相变张量;Θ(ξ) 为 SMA 弹簧的 式中: CA,CM 为应力对相变温度的影响 系 数;σcsr, σcf r 为马氏体相变开始和结束时的临界应力。
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