Bistable diverter valve in microfluidics |
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Authors: | Email author" target="_blank">V?Tesa?Email author H?C?H?Bandalusena |
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Institution: | (1) Institute of Thermomechanics ASCR, v.v.i, Prague, Czech Republic;(2) Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, United Kingdom |
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Abstract: | Bistable diverter valves are useful for a large number of no-moving-part flow control applications, and there is a considerable
interest in using them also in microfluidics, especially for handling small pressure-driven flows. However, with decreasing
Reynolds number, the Coanda effect—on which the flow diverting effect depends—becomes less effective. Authors performed a
study, involving flow visualisation, PIV experiments, measurements of the flow rates, and numerical flowfield computations,
aimed at clarifying behaviour of a typical fluidic valve at low Reynolds numbers. A typical fluidic valve originally developed
for high Re operation was demonstrated to be useful, though with progressively limited efficiency, down to surprisingly low
Re values as small as Re = 800. Also observed was a previously not reported discontinuation in the otherwise monotonic decrease
in performance at Re between 1,500 and 2,000. |
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Keywords: | |
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