NDLI: Effects of the extensional rate on two-dimensional turbulence of semi-dilute polymer solution flows

Content Provider	Springer Nature Link
Author	Hidema, Ruri Suzuki, Hiroshi Hisamatsu, Shion Komoda, Yoshiyuki Furukawa, Hidemitsu
Copyright Year	2013
Abstract	An experimental study has been performed to investigate the relationship between the extensional viscosity of polymers and the turbulent drag reduction. In order to obtain the flow which is mostly dominated by extensional flow, two-dimensional (2D) grid turbulence made by flowing soap films was used. Extensional rate added to the flow was controlled by changing the conformation of the grid. Polyethylene oxide, as a flexible polymer, and hydroxypropyl cellulose, as a rigid rod-like polymer were added to the flow. Several extensional rates affect polymer behaviors, which induce different effects. Drag reduction effects of polymers under several extensional rates were visualized and analyzed by image processing. Rheological properties of the polymer solutions were also measured by a rheometer. The results indicated that the mechanisms of energy transfer are different in the streamwise and normal directions. The critical concentration to observe drag reduction effects in 2D turbulence was changed by the extensional rate. When extensional rate is higher, the effects were started to observe from lower concentration. These results were confirmed to correspond to the drag reduction effects obtained by classical pressure drop experiments in a pipe flow.
Starting Page	949
Ending Page	961
Page Count	13
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	52
Issue Number	10-12
e-ISSN	14351528
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-09-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Extensional rate Extensional viscosity Drag reduction Polymer solution Two-dimensional turbulence Flow visualization Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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