Characterization of turbulent drag reduction in rotating disk system |
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| Authors: | Kyung Soo Yang Hyoung Jin Choi Chong Bo Kim In Suhk Kim Myung S Jhon |
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| Affiliation: | (1) Dept. of Polymer Science and Eng., Inha University, Inchon, Korea;(2) Department of Mechanical Eng., Inha University, Inchon, Korea;(3) Dept. of Mechanical Eng., Myongji University, Yongin, Korea;(4) Dept. of Chem. Eng., Carnegie Mellon University, 15213 Pittsburgh, PA, USA |
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| Abstract: | Turbulent drag reduction in a rotating disk apparatus was characterized for a homologous series of polyethylene oxide (PEO)
polymers covering a wide range of molecular weights. The concentration dependence of drag reduction in this system was shown
to obey an empirical drag reduction equation which had been previously established by Virk et al. for flows in capillary tubes.
The linear correlation between polymer concentration and C/DR for different molecular weights of PEO was also obtained. In
addition, C]. defined as a characteristic intrinsic concentration, was found to be extremely useful in normalizing the drag
reduction data in one homologous series of PEO. |
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