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PTV investigation of phase interaction in dispersed liquid–liquid two-phase turbulent swirling flow

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Abstract

An investigation of dispersed liquid–liquid two-phase turbulent swirling flow in a horizontal pipe is conducted using a particle tracking velocimetry (PTV) technique and a shadow image technique (SIT). Silicone oil with a low specific gravity is used as immiscible droplets. A swirling motion is given to the main flow by an impeller installed in the pipe. Fluorescent tracer particles are applied to flow visualization. Red/green/blue components extracted from color images taken with a digital color CCD camera are used to simultaneously estimate the liquid and droplet velocity vectors. Under a relatively low swirl motion, a large number of droplets with low specific gravity tend to accumulate in the central region of the pipe. With increasing droplet volume fraction, the liquid turbulence intensity in the axial direction increases while that in the wall-normal direction decreases in the central region of the pipe. In addition, the turbulence modification in the present flow is strongly dependent on the droplet Reynolds number; however, the interaction of droplet-induced turbulences is significant due to vortex shedding, particularly at high droplet Reynolds numbers and higher droplet volume fraction.

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Authors and Affiliations

  1. Department of Mechanical and System Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyou-ku, Kyoto, 606-8585, Japan

    Atsuhide Kitagawa & Yoshimichi Hagiwara

  2. Hiroshima Machinery Works, Mitsubishi Heavy Industries, Ltd, Kannonshinmachi, Nishi-ku, Hiroshima, 733-8553, Japan

    Takuro Kouda

Authors
  1. Atsuhide Kitagawa
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  2. Yoshimichi Hagiwara
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  3. Takuro Kouda
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Correspondence to Atsuhide Kitagawa.

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Kitagawa, A., Hagiwara, Y. & Kouda, T. PTV investigation of phase interaction in dispersed liquid–liquid two-phase turbulent swirling flow. Exp Fluids 42, 871–880 (2007). https://doi.org/10.1007/s00348-007-0291-5

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  • DOI: https://doi.org/10.1007/s00348-007-0291-5

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