無閥驅動是一種特殊的流體輸送機制，普遍存在於生物體中，近年來也發展了許多相關的工程方面應用(如藥物輸送、生醫檢測晶片等)，而成為一個重要的議題。本研究中我們建立了一組閉迴路的無閥流體驅動實驗系統，以及特殊設計的擠壓制動器，系統除了可以展現無閥驅動的一般特性之外，還能夠觀察改變各種參數如預壓條件、擠壓器進程、系統剛性對驅動效果的影響，並從中歸納出各參數的影響幅度。此外，我們也觀察擠壓制動器與受壓部分的互動行為對系統的影響，發現兩者之間的接觸模式與流量變化有明顯的關連，系統的重要性質如門檻頻率、自然頻率也一併深入探討。上述的門檻頻率為在預壓狀態下，使擠壓器與系統受壓部分恰好發生分離的驅動頻率。利用之前本研究團隊的理論所提出的無因次參數，門檻頻率與上述各項參數之間的關係可以整理成較簡潔的型式，這表示該組無因次參數的整理是一個正確的方向。且根據該理論，系統的自然頻率也可以得到合理的估算。

Valveless pumping is a special fluid transport mechanism which widely exists in biological systems. It has become an important issue recently, because there are a lot of relevant applications in engineering, such as drug delivery and biochips.
In this work, we construct a closed-loop valveless pumping system and a special design of actuator. This system is used to demonstrate the nature of valveless pumping, and we can explore the effects on mean flow rate by changing the system parameters such as the pre-compression condition, stroke of actuator, and system rigidity. By such exploration, we can deduce the extent of influence of each parameter. In addition, we also observe the interaction between the actuator and the compressed part of the system. Specifically, it is found that this interaction strongly affects the response of the whole system, as predicted in a previous theoretical work of our group. Meanwhile, other important characteristics of this system, such as the natural frequency and threshold frequency (fth) are also discussed. The aforementioned fth is the minimum of the driving frequency of the actuator beyond which the compressed part of the system would separate from the actuator even if the system is pre-compressed. It is also found that the dimensionless parameters proposed by our group are useful for correlating fth to the parameters of the system in a simple way.

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