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Rotating disk apparatus for polymer-induced turbulent drag reduction

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Abstract

In order to investigate turbulent drag reduction (DR), a rotating disk apparatus (RDA) generating an “external flow” was designed and then polymer-induced DR efficiency of water-soluble polymers both poly (ethylene oxide) (PEO) and poly (acryl amide) (PAAM) were examined as a function of either polymer concentration or temperature. The need for a sensitive measuring system at high Reynolds numbers has stimulated the development of a high-precision computer-aided system, which is able to measure the difference between the torques for a Newtonian fluid and a dilute polymeric solution with drag reducers very accurately. Their mechanical degradation behavior in the RDA as a function of time in a turbulent flow was also analyzed using both a simple exponential decay function and a fractional exponential decay equation. The fractional exponential decay equation was found to fit the experimental data better than the simple first-order degradation exponential decay function in the case of PEO.

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Inha University, Incheon, 402-751, Korea

    Cheng Hai Hong & Hyoung Jin Choi

  2. Energy Conversion Department, Korea Institute of Energy Research, Daejeon, 305-343, Korea

    Jae Ho Kim

Authors
  1. Cheng Hai Hong
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  2. Hyoung Jin Choi
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  3. Jae Ho Kim
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Correspondence to Hyoung Jin Choi.

Additional information

This paper was presented at the 9th Asian International Conference on Fluid Machinery (AICFM9), Jeju, Korea, October 16–19, 2007.

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Hong, C.H., Choi, H.J. & Kim, J.H. Rotating disk apparatus for polymer-induced turbulent drag reduction. J Mech Sci Technol 22, 1908–1913 (2008). https://doi.org/10.1007/s12206-008-0731-z

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  • DOI: https://doi.org/10.1007/s12206-008-0731-z

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