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Mar 2002

Volume 73, Issue 3, pp. 1103-1683

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back to top BASIC PHENOMENA

The slowest soap-film tunnel in the Southwest

D. Georgiev and P. Vorobieff

Rev. Sci. Instrum. 73, 1177 (2002); http://dx.doi.org/10.1063/1.1446040 (8 pages) | Cited 7 times

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Gravity-driven soap-film channels offer a convenient way to study two-dimensional hydrodynamics in the laboratory. With recently developed quantitative soap-film diagnostic techniques, velocity and thickness field information can be acquired to provide a complete description of the flow. We present a study of soap-film flow in a state-of-the-art tilted soap-film tunnel which can sustain a mean freestream velocity about 0.5 m/s with velocity fluctuations on the order of 1%. Our investigation concentrates on the evolution of the velocity and thickness profiles with downstream distance. We observe a hydrodynamically fully developed flow within a substantial range of distances and compare our results with the analytical solution based on the assumptions of linear air drag and constant film thickness. We find air drag to be the dominant dissipative mechanism in the flow, although the role of internal viscous dissipation is also apparent. Direct measurements of the air drag coefficient are in good agreement with the values inferred from the analytical solution. © 2002 American Institute of Physics.
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47.55.-t Multiphase and stratified flows

An improved approach for precise in situ measurements of microflows

Xuanxiong Zhang, Xujiang He, Yuan Xu, Thomas H. Gong, and Francis Eng Hock Tay

Rev. Sci. Instrum. 73, 1185 (2002); http://dx.doi.org/10.1063/1.1448141 (3 pages) | Cited 1 time

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An improved approach for extremely low fluid dosing rate on-line measurements was described. The approach can be employed to conduct in situ calibration of microfluidic devices. It is essentially a standard gravimetric method, with some modifications. The experimental setup included a high precision balance interfaced to a data sampling/processing PC. The continuous dosing rate generated from an electrochemical actuator was measured. A stable dosing rate reached as low as 0.19 μl/min (deionized water), which was lower than the water evaporation rate. © 2002 American Institute of Physics.
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47.80.-v Instrumentation and measurement methods in fluid dynamics
06.30.Dr Mass and density
47.85.Np Fluidics
07.10.Cm Micromechanical devices and systems
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