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Drag reduction with heterogeneous polymer injection into a turbulent pipe flow

Technology reports of the Yamaguchi University Volume 4 Issue 1 Page 51-63
published_at 1987-12
KJ00004351095.pdf
[fulltext] 1.15 MB
Title
Drag reduction with heterogeneous polymer injection into a turbulent pipe flow
Creators Usui Hiromoto
Creators Kodama Matsuru
Creators Sano Yuji
Source Identifiers
The injection of polymer solution into turbulent pipe flow caused significant drag reduction. The injected polymer threads were visualized photographically. Combining the flow visualization results with the measurements of drag reduction caused by the centerline injection, the possible interaction between polymer threads and turbulent eddies was discussed. It was proposed that, for the centerline injection system, there existed the maximum drag reduction asymptote which was different from the maximum drag reduction asymptote for premixed polymer solutions. This was confirmed by evaluating the pipe diameter effect and the concentration effect in the centerline injection system. The annuler injection in the near wall region caused more significant drag reduction than those obtained for the centerline injection. The maximum drag reduction by annuler injection coincided with the maximum drag reduction asymptote for the premixed polymer solutions.
Subjects
工学 ( Other)
Languages eng
Resource Type departmental bulletin paper
Publishers 山口大学工学部
Date Issued 1987-12
File Version Version of Record
Access Rights open access
Relations
[ISSN]0386-3433
[NCID]AA0086073X
Schools 工学部