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Passive Scalar Transport in a Turbulent Cylinder Wake in the Presence of a Downstream Cylinder

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Abstract

This work aims to investigate how the presence of a downstream cylinder affects the passive scalar transport in a cylinder wake. The wake was generated by two tandem brass circular cylinders of the same diameter (d). The cylinder centre-to-centre spacing L/d was 1.3, 2.5 and 4.0, respectively, covering the three typical flow regimes of this flow. The upstream cylinder was slightly heated. Measurements were conducted at x/d= 10 and Re (≡ dU ∞/ν, where U ∞ is the free-stream velocity and ν is the kinematic viscosity of fluid) = 7000. A three-wire probe consisting of an X-wire and a cold wire was used to measure the velocity and temperature fluctuations, while an X-wire provided a phase reference. The phase-averaged velocity vectors and vorticity display single vortex street behind the downstream cylinder, irrespective of the flow regimes. However, the detailed flow structure exhibits strong dependence on L/d in terms of the Strouhal number, the vortex strength and its downstream evolution. This naturally affects passive scalar transport. The coherent and incoherent heat flux vectors show significant variation for different L/d.

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Authors and Affiliations

  1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

    M.W. Yiu & Y. Zhou

  2. Energy and Thermofluids Engineering, CSIRO Manufacturing and Infrastructure Technology, Melbourne, A, ustralia

    Y. Zhu

Authors
  1. M.W. Yiu
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  2. Y. Zhou
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  3. Y. Zhu
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Correspondence to Y. Zhou.

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Yiu, M., Zhou, Y. & Zhu, Y. Passive Scalar Transport in a Turbulent Cylinder Wake in the Presence of a Downstream Cylinder. Flow, Turbulence and Combustion 72, 449–461 (2004). https://doi.org/10.1023/B:APPL.0000044406.32816.46

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  • DOI: https://doi.org/10.1023/B:APPL.0000044406.32816.46

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