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Frontiers of Mechanical Engineering

Front Mech Eng    2013, Vol. 8 Issue (3) : 311-318
Valveless pumping using a two-stage impedance pump
V. C.-C. LEE1(), Y. A. ABAKR2, K.-C. WOO2
1. School of Engineering and Science, Curtin University Sarawak Malaysia, CDT 250, 98009 Miri, Sarawak, Malaysia; 2. Department of Mechanical, Materials and Manufacturing, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia
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Impedance pump is defined as a type of valveless pumping mechanism, where an elastic tube is joined with a tube of different impedance, a periodic asymmetrical compression on part of the elastic tube will produce a unidirectional flow. Numerical and experimental studies had been conducted in the past, but little experimental work was found to exploit the principle of multi-stage impedance pumping for fluid transportation. This paper concentrates on the fluid behavior for an open-loop two-stage system experimentally. The aim of this work is to have an insight on the deliverable head and pumping rate of an open-loop two-stage impedance pumping system. This paper generally investigates the effect of different parameters towards the generation of unidirectional flows and composite flow of two opposite directions. Results obtained are of significant values.

Keywords valveless pumping      open-loop      two-stage      unidirectional      composite     
Corresponding Author(s): LEE V. C.-C.,   
Issue Date: 05 September 2013
 Cite this article:   
V. C.-C. LEE,Y. A. ABAKR,K.-C. WOO. Valveless pumping using a two-stage impedance pump[J]. Front Mech Eng, 2013, 8(3): 311-318.
Fig.1  Schematic diagram of a two-stage impedance pumping system
Fig.2  (a) Normalized mean height difference with respect to Womersley number for a single-stage impedance pump; (b) Normalized deliverable pumping rate with respect to Womersley number
Fig.3  Normalized mean height difference for respective reservoir in accordance to the setup: (a) left reservoir; (b) middle reservoir; (c) right reservoir
Fig.4  Normalized pumping rate with respect to driving frequency of different /
Fig.5  Mean height difference for respective reservoir for difference Womersley number (excitation frequency): (a) 75.5 (4 Hz); (b) 79.7 (4.5 Hz); (c) 84.02 (5 Hz)
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