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Mao, Zhuo-Xiong 2014-12-15T19:54:20Z 2014-12-15T19:54:20Z 10000-01-01 1984 1984 Measurements are presented of the time variation of the wall shear stress caused by the imposition of a sinusoidal oscillation on a turbulent pipe flow. The amplitude of the oscillation is small enough that a linear response is obtained and the dimensionless frequency, (omega)('+), is large compared to that studied by most previous investigators. The most striking feature of the results is a relaxation effect, similar to what has been observed for flow over a wavy surface, whereby the phase angle characterizing the temporal variation of the wall shear stress undergoes a sharp change over a rather narrow range of (omega)('+). At (omega)('+) larger than the median frequency of the turbulence there appears to be an interaction between the imposed flow oscillation and the turbulence fluctuations in the viscous sublayer, which is not described by present theories of turbulence. Made available in DSpace on 2014-12-15T19:54:20Z (GMT). No. of bitstreams: 1 8502235.pdf: 4733616 bytes, checksum: c7e6adec9f7cde0c2c2808889a7379e3 (MD5) Previous issue date: 1984 Embargo set by: Seth Robbins for item 69913 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 173 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984. http://hdl.handle.net/2142/69747 (UMI)AAI8502235 Engineering, Chemical Studies of the Wall Shear Stress in a Turbulent Pulsating Pipe Flow text Chemical Engineering Chemical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.