Experimental Analysis of Impedance-Driven Reverse Flow Dynamics

Abstract:

Impedance pump is a type of valveless pumping device, in which it utilizes a bio-inspired mechanism for pumping of fluid based on resonant wave interactions along a flexible media. By inducing a periodic asymmetrical compression on the flexible media will produce a unidirectional flow within the system. The impedance pump has many beneficial characteristics which make it an effective driving mechanism, especially for micro-fluidic systems. In addition, the wave-based mechanism through which pumping occurs infers many benefits in terms of simplicity of design and manufacturing. Adjustment of simple parameters such as the excitation frequency or compression location will reverse the direction of flow, providing a very versatile range of flow outputs. This paper describes the experimental analysis of such impedance-driven flow with emphasis on dynamical study of the reverse flow in open-loop environment. In this study, tapered section with converging steps is introduced at both ends of the flexible media to amplify the reverse flow. Study conducted shows that the reverse peak flow is rather significant with estimate of 23% lower than the forward peak flow. The flow dynamics on the other hand has shown to exhibit different characteristics as per the forward peak flow.

• Periodical: Applied Mechanics and Materials (Volume 819)
• Pages: 305-308
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.819.305
• Online since: January 2016
• Authors: V.C.C. Lee, Chang Hong Chai, Ming Chiat Law, S.K. Wee
• Keywords: Dynamic, Impedance-Driven, Reverse Flow

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