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Characterization of Pipe-Flow Turbulence and Mass Transfer in a Curved Swirling Flow Behind an Orifice

  • N. FujisawaEmail author
  • R. Watanabe
  • T. Yamagata
  • N. Kanatani
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 23)

Abstract

This paper deals with the extraction of turbulent structure correlated with the wall mass transfer in a curved swirling pipe flow behind an orifice. The cross-sectional velocity field behind the orifice is measured by the Stereo Particle Image Velocimetry (SPIV) and the results are analyzed by the proper orthogonal decomposition (POD). The instantaneous velocity field shows the asymmetric vortex structure in the cross section due to the combined effect of the swirling flow and the secondary flow generated at the upstream elbow. The POD analysis indicates that the highly turbulent flow is generated on the upper left-hand side of the pipe in the lower POD modes suggesting the occurrence of high wall-thinning rate due to the mass transfer enhancement, while that of the higher modes do not show such asymmetry. This result suggests that the lower POD modes of the velocity field contribute to the non-axisymmetric pipe-wall thinning behind an orifice in a curved swirling flow.

Keywords

Particle Image Velocimetry Proper Orthogonal Decomposition Mass Transfer Rate Turbulent Energy Proper Orthogonal Decomposition Mode 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • N. Fujisawa
    • 1
    Email author
  • R. Watanabe
    • 2
  • T. Yamagata
    • 1
  • N. Kanatani
    • 2
  1. 1.Visualization Research CenterNiigata UniversityNiigataJapan
  2. 2.Graduate School of Science and TechnologyNiigata UniversityNiigataJapan

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