2016年8月
Pseudo-laminarization effect of several types of surfactant solutions in small-sized pipe flows
ACTA MECHANICA
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- 巻
- 227
- 号
- 8
- 開始ページ
- 2061
- 終了ページ
- 2074
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s00707-016-1616-3
- 出版者・発行元
- SPRINGER WIEN
Fluid mechanics at a very small scale, particularly micro-flows and nano-flows, have many technical applications, and the elastic properties of small-scale flows are strongly expressed even for dilute aqueous solutions of non-Newtonian fluids. We have investigated the flow properties of water and several types of surfactant solutions with spherical or rod-like micelles. Before the flow property investigations, Newtonian and non-Newtonian viscosities for the test fluids were observed by using a capillary viscosity meter. Pressure drops were experimentally measured, and the frictional coefficient of the pipe was estimated in flows through capillaries ranging from 133 m to 2.87 mm in diameter. For water flow, good agreement was obtained between the experimental results and the predictions for Hagen-Poiseuille flow and the Blasius expression. The flow properties of the spherical micelle surfactant solutions agreed with those of water. However, the rod-like micelle surfactant solutions maintained laminar flows in the transition regions. Thus, a pseudo-laminarization effect for surfactant solutions with rod-like micelles is indicated. A relationship between these experimental results and estimated first normal stress differences is also strongly suggested.
- リンク情報
- ID情報
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- DOI : 10.1007/s00707-016-1616-3
- ISSN : 0001-5970
- eISSN : 1619-6937
- Web of Science ID : WOS:000380365900001