Abstract
THE mechanism of some high molecular weight polymers to reduce the frictional resistance of liquids is the subject of considerable speculation and research1, and many investigators have noted exceptionally high pipe entry losses2. In the course of such experiments, this author observed that high pressure losses (of the order of ten kinetic heads) similarly existed across the turbulent suppressant screens positioned upstream of the pipe inlet nozzle. Such an effect could have a substantial influence in the free stream turbulence level as well as being germane to flowmeter calibrations and a variety of design situations.
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References
Lumley, J. L., Appl. Mech. Rev., 20, 1139 (1967).
Metzner, A. B., and White, J. L., AIChE Jour., 11, 989 (1965).
Bate, H. G., Nature, 216, 1100 (1967).
Brennen, C., and Gadd, G. E., Nature, 215, 1368 (1967).
Rouse, H., and Howe, J. W., Basic Mechanics of Fluids, 125 (John Wiley and Sons, London, 1953).
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GILES, W. Orifice Flows of Polyethylene Oxide Solutions. Nature 224, 584–585 (1969). https://doi.org/10.1038/224584a0
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DOI: https://doi.org/10.1038/224584a0
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