NDLI: Performance Enhancement by Dynamic Valve Timing of a Multistage Vacuum Micropump

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Performance Enhancement by Dynamic Valve Timing of a Multistage Vacuum Micropump

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kumar, Karthik Luis, P. Bernal Najafi, Khalil
Copyright Year	2010
Abstract	This paper presents the results of a theoretical analysis of dynamic valve timing on the performance of a multistage peristaltic vacuum micropump. Prior work has shown that for optimum steady state performance a fixed valve timing which depends on the operating pressure can be found. However, the use of a fixed valve timing could hinder performance for transient operation when the pump is evacuating a fixed volume. At the beginning of the transient the pump operates at low pressure difference and a large flow rate would be desirable. As the pump reaches high vacuum the pressure difference is large and the flow rate is necessarily small. Astle and coworkers1–3 have shown using a reduced order model that for steady state operation short valve open time results in lower inlet pressure and flow-rate and conversely. Here we extend the model of Astle and coworkers to include transient operation, multiple coupled stages and non-ideal leaky valves, and show that dynamic valve timing (DVT) reduces the transient duration by 30% compared to high vacuum pressure valve timing. The results also show a significant reduction in resonant frequency of the pump at low pressures, and quantify the effect of valve leakage.
Starting Page	221
Ending Page	228
Page Count	8
File Format	PDF
ISBN	9780791844472
DOI	10.1115/IMECE2010-39117
Volume Number	Volume 10: Micro and Nano Systems
Conference Proceedings	ASME 2010 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2010-11-12
Publisher Place	Vancouver, British Columbia, Canada
Access Restriction	Subscribed
Subject Keyword	Leakage Vacuum Pumps Micropumps Valves Resonance Theoretical analysis Pressure Flow (dynamics) Steady state Transients (dynamics)
Content Type	Text
Resource Type	Article

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