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The growth of swirl in curved circular pipes

dc.contributor.authorOlson, D. E.en_US
dc.contributor.authorSnyder, B.en_US
dc.date.accessioned2010-05-06T20:39:24Z
dc.date.available2010-05-06T20:39:24Z
dc.date.issued1983-02en_US
dc.identifier.citationOlson, D. E.; Snyder, B. (1983). "The growth of swirl in curved circular pipes." Physics of Fluids 26(2): 347-349. <http://hdl.handle.net/2027.42/69473>en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/69473
dc.description.abstractSteady secondary currents in the entry region of curved circular pipes with different curvature ratios (R/a=4.66 and 16) have been delineated at moderate Dean numbers by pulsed‐probe anemometry. When swirl is quantified using circulation loops, flow development can be scaled by the length parameter (aR)1/2. The initial growth of axial swirl seems consistent with a model of vorticity transport based on average streamline curvature, but does not progress monotonically to an asymptotic value. Instead, an abrupt relaxation occurs approximately 2(aR)1/2 downstream from the inlet, suggesting that boundary‐layer current intensifies well before the axial velocity profile can be reordered by convection.en_US
dc.format.extent3102 bytes
dc.format.extent281688 bytes
dc.format.mimetypetext/plain
dc.format.mimetypeapplication/pdf
dc.publisherThe American Institute of Physicsen_US
dc.rights© The American Institute of Physicsen_US
dc.titleThe growth of swirl in curved circular pipesen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumPulmonary Disease Unit, Veterans Adminstration Medical Center/University of Michigan, Ann Arbor, Michigan 48105en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/69473/2/PFLDAS-26-2-347-1.pdf
dc.identifier.doi10.1063/1.864169en_US
dc.identifier.sourcePhysics of Fluidsen_US
dc.identifier.citedreferenceY. Agrawal, L. Talbot, and K. Gong, J. Fluid Mech. 85, 497 (1978).en_US
dc.identifier.citedreferenceD. E. Olson, Ph.D. thesis, University of London, 1971.en_US
dc.identifier.citedreferenceL.‐S. Yao and S. A. Berger, J. Fluid Mech. 67, 177 (1975).en_US
dc.identifier.citedreferenceH. B. Squire and K. G. Winter, J. Aeronaut. Sci. 18, 271 (1951).en_US
dc.identifier.citedreferenceW. R. Hawthorne, Proceedings of the Seminar on Aeronautical Sciences (National Aeronautics Laboratory, Bangalore, India, 1961), pp. 307–333.en_US
dc.identifier.citedreferenceThis device, which can detect flow reversal, is discussed in Ref. 2. Pointwise velocities are determined by measuring the transport time and direction of a thermal pulse initiated at an upstream wire and sensed at a downstream wire.en_US
dc.identifier.citedreferencePossibly because inlet vorticity was not as closely confined to the pipe walls as in Agrawal’s experiments, some details of the secondary flow were found to be quite sensitive to the inlet velocity distribution.en_US
dc.identifier.citedreferenceSee Ref. 5, pp. 319–324.en_US
dc.identifier.citedreferenceHelical pitch is defined by Taylor as the axial length required for a fluid parcel entrained in an eddy to trace a complete circuit. G. I. Taylor, Proc. R. Soc. London Ser. A 124, 243 (1929).en_US
dc.owningcollnamePhysics, Department of


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