Instantaneous mass transfer measurement and its relation to large-scale structures in pipe flow

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書誌事項

公開日
2018-06
資源種別
journal article
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
  • https://www.elsevier.com/legal/tdmrep-license
DOI
  • 10.1016/j.ijheatfluidflow.2018.03.016
公開者
Elsevier BV

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説明

Abstract The flow field and mass transfer rate in a straight pipe are measured simultaneously using particle image velocimetry (PIV) and an electrochemical method, respectively. Turbulence structures of length scales larger than 2.4 R in the log region are studied in relation with the mass transfer fluctuations in the near-wall region. The time-series contours of the fluctuations in mass transfer and stream-wise velocity are compared, and their correlation coefficient is discussed. Using the time-series contour, it can be confirmed that the footprint of the large-scale turbulent structures in the log region affects the near-wall region, which enhances the mass transfer rate. By comparing the two-point correlations of the stream-wise velocity fluctuation and mass transfer fluctuation, the mass transfer rate at the wall is observed to be related with the large-scale velocity structures in the log region.

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