Polymer “threads” and drag reduction |
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| Authors: | J. W. Hoyt R. H. J. Sellin |
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| Affiliation: | (1) Department of Civil Engineering, University of Bristol, Bristol, UK;(2) Dept. of Civil Engineering, University of Bristol, Queen's Building University Walk, BS8 1TR Bristol, UK |
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| Abstract: | A number of different polymer fluids were ejected on the centerline of a water pipe-flow facility. Two distinct flow regions were identified: Reynolds numbers above 25000, where centerline injection acted as a rather efficient mixing device for water-soluble polymer — and no drag-reduction resulted from non water-soluble materials; and Reynolds numbers from 10000 to 25000, where strong evidence exists that under certain conditions, a viscoelastic fluid thread can interact with turbulence eddies and reduce the overall flow friction in the pipe.On Sabbatical leave from San Diego State University. |
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| Keywords: | Drag reduction polymer threads pipe flow |
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