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LDA measurements of Reynolds stresses in a swirling turbulent pipe flow

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Part of the Springer Proceedings in Physics book series (SPPHY,volume 132)

Abstract

This study concentrates on turbulent swirling flows, which are constrained in a stationary and straight circular pipe. Aim was to determine the sole effect of swirl component and its decay on a developing turbulent pipe flow. For this purpose, velocity statistics of a pipe flow with a Reynolds number of \({\mathop{\rm Re}\nolimits} _D = U_m D/v \cong 30.000\) were measured at several downstream positions up to z/D = 17.3. The strength of inlet swirl was adjusted to the desired swirl numbers of N = 0.3 (weak) and N = 1.0 (strong). Emphasis was put on generating a solid-body rotation type of swirl while maintaining axisymmetric inlet conditions. Consequently, the determined mean velocity and Reynolds stress profiles showed almost no deviation from axisymmetry. Furthermore, non-zero Reynolds shear stresses were determined. Both findings contradict some results in the literature. Subtle increase in the magnitude of Reynolds stresses was observed as the swirl component decayed partially.

Keywords

  • Reynolds Stress
  • Reynolds Shear Stress
  • Swirl Number
  • Swirl Generator
  • Laser Doppler Anemometer

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Correspondence to B. Z. Genç .

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© 2009 Springer-Verlag Berlin Heidelberg

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Genç, B.Z., Ertunç, Ö., Jovanović, J., Delgado, A. (2009). LDA measurements of Reynolds stresses in a swirling turbulent pipe flow. In: Eckhardt, B. (eds) Advances in Turbulence XII. Springer Proceedings in Physics, vol 132. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03085-7_148

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  • DOI: https://doi.org/10.1007/978-3-642-03085-7_148

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-03084-0

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