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

Hiromoto Usui, Katsuhiro Maeguchi, Yuji Sano

doi:10.1063/1.866605

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

DOI PDF 被引用文献4件

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

説明

<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>