Drag reduction caused by the injection of polymer thread into a turbulent pipe flow

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  • Hiromoto Usui
    Department of Chemical Engineering, Yamaguchi University, Tokiwadai, Ube, 755 Japan
  • Katsuhiro Maeguchi
    Department of Chemical Engineering, Yamaguchi University, Tokiwadai, Ube, 755 Japan
  • Yuji Sano
    Department of Chemical Engineering, Yamaguchi University, Tokiwadai, Ube, 755 Japan

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<jats:p>Drag reduction caused by the injection of concentrated polymer solutions into a turbulent pipe flow was studied. Measurements were made of the radial distribution of fluctuating velocities by means of video image analysis. The results showed that a higher velocity was observed for injected polymer threads and both the radial fluctuation and the Reynolds stress were significantly suppressed. It was suggested that the wall turbulence structure might be controlled by suppressing the large scale turbulent motion in the turbulent core region.</jats:p>

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