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http://dx.doi.org/10.3795/KSME-B.2011.35.8.825

Dynamic Characterization of Passive Flow-Rate Regulator Using Pressure-Dependent Autonomous Deflection of Parallel Membrane Valves  

Doh, Il (Dept. of Bio and Brain Engineering, KAIST)
Cho, Young-Ho (Dept. of Bio and Brain Engineering, KAIST)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.8, 2011 , pp. 825-829 More about this Journal
Abstract
We performed a dynamic characterization of passive flow-rate regulators, which compensate for inlet pressure variation and maintain a constant flow rate for precise liquid control in microfluidic systems. To measure the flow rate for a short time, much less than the period of the dynamic inlet pressure, we use the particle image velocimetry (PIV) method. DI water containing fluorescent beads with a $0.7-{\mu}m$ diameter was supplied to the flow-rate regulators, and two successive images of the particles were taken by a pulse laser and a fluorescent microscope to measure the flow velocity. For a dynamic inlet pressure of frequency 60 Hz, the flow velocity was constant with an average of 0.194 ${\pm}$ 0.014 m/s as the inlet pressure varied between 20 kPa to 50 kPa. The flow-rate regulators provided a constant flow rate of $5.82{\pm}0.29\;{\mu}l/s$ in the frequency range of the inlet pressure from 1 Hz to 60 Hz.
Keywords
Passive Flow-rate Regulator; Dynamic Characterization; Autonomous Deflection;
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