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Quadrant Analysis of Bubble Induced Velocity Fluctuations in a Transitional Boundary Layer

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Abstract

Our previous study showed that the frictional drag decreases with increasing void fraction at Re >1300, while it increases at Re < 1000. Decomposition of the Reynolds shear stress also implied that bubbles induce isotropy of turbulence. In order to confirm our previous analysis and to further investigate flow fields in the vicinity of bubbles, we analyze velocity fluctuations on the quadrant space in the streamwise and transverse directions (u′-v′ plane). Here, we focus on two specific Reynolds numbers (at Re ≈ 900 and ≈ 1410, which are close to the laminar-to-turbulent transition regime) and discuss bubble effects on sweep (u′ > 0, v′ v′ < 0) and ejection (u′ < 0, v′ > 0) events as a function of the Reynolds number. We also illustrate velocity fluctuations in the vicinity of an individual bubble and a swarm of bubbles on the u′-v′ coordinates. The results show that a bubble swarm suppresses the velocity fluctuations at Re ≈1410.

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Authors and Affiliations

  1. Graduate School of Engineering, Fiber Amenity Engineering Course, University of Fukui, Bunkyo 3-9-1, Fukui, 910-8507, Japan

    Jian Huang

  2. Division of Energy and Environment System, School of Engineering, Hokkaido University, Sapporo, Japan

    Yuichi Murai

  3. Graduate School of Engineering, University of Fukui, Bunkyo 3-9-1, Fukui, 910-8507, Japan

    Fujio Yamamoto

Authors
  1. Jian Huang
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  2. Yuichi Murai
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  3. Fujio Yamamoto
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Biography: HUANG Jian (1980-), Male, Ph. D. Candidate

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Huang, J., Murai, Y. & Yamamoto, F. Quadrant Analysis of Bubble Induced Velocity Fluctuations in a Transitional Boundary Layer. J Hydrodyn 21, 93–99 (2009). https://doi.org/10.1016/S1001-6058(08)60123-7

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  • DOI: https://doi.org/10.1016/S1001-6058(08)60123-7

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