The Influence of Polymer Additives on the Coherent Structure of Turbulent Channel Flow
作者： B. Gampert , C. K. Yong
DOI: 10.1007/978-3-642-50971-1_19
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摘要: The intension of this paper is to identify changes in the ejection and sweep events due addition ionic Polyacrylamide Praestol 2360 (Fa. Stockhausen) deionized water. Laser- Doppler measurements have been carried out fully developed turbulent square duct flow polymer solutions comparatively low Re numbers between = 4800 16000. Drag reductions were close maximum values as given by Virk. Mean velocity profiles, Reynolds stress rms-values fluctuations are presented. Joint probability density functions for (u’,v’) (∂u’/∂t, ∂ v’/∂ t). Time fractions, contributions t) four quadrants u’-v’-plane measured.
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