Abstract
The effects of inlet conditions on downstream mixing inturbulent pipe flow have been studied with the use of photoactivatable fluorophores and standard laser-induced fluorescencetechniques. The different inlet conditions included both geometrychanges and changes in the manner in which the constituents wereintroduced into the flow. Results indicate that small changes ininlet geometry can greatly affect the downstream mixing rate.Changes in the geometry of the inlet had a greater influence ondownstream mixing than did the manner in which constituents wereintroduced into the flow. Further experiments included a staticmixer that was used in conjunction with two different inletconditions. It was found that the inlet condition greatly affectsthe effectiveness of the static mixer. The static mixer is mosteffective when placed downstream of an inlet that produces scalarlength scales that are similar in size to the elements in the mixer(i.e., the pipe diameter). Overall, the results of theseexperiments demonstrate that the method used to introduce twoconstituents to be mixed in pipe flow can profoundly affect thedownstream mixing rate.
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