A Study on Anomalous Turbulent FIows of Non-Newtonian Fluids : 2nd Report, Transitional Region from Laminar to Turbulent Flow

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概要

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• Transition from laminar to turbulent pipe flows of dilute polymer solutions is investigated experimentally. 0.5〜120 wppm waster solutions of PEO 18 are used and the following results are obtained on the pipes 0.256 cm and 0.132 cm in diameter. (1) Before transition there is a flow region where the friction factor λ departs gradually upward from the line λ=64/R_e. This region begins at a lower than the critical Reynolds number of Newtonian fluid (≈2300). (2) There appear wavy surfaces or windings on the jets in this flow region, and a change of the jet appearance corresponds to that of the friction factor approximately. (3) It is made clear that wavy surfaces or windings occur by fluctuations in a pipe flow and the fluctuations are different from those of transition of water.

• 一般社団法人日本機械学会の論文

著者

• Tomita Yukio

  Tokyo Institute Of Technology

• MOCHIMARU Yoshihiro

  Tokyo Institute of Technology

• HASEGAWA Tomiichi

  Tokyo Institute of Technology

• Mochimaru Yoshihiro

  Tokyo Institute Of Technology.

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