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Related Experiment Videos

Turbidity current in a circular settling tank.

K Fujisaki1, N Nagata

  • 1Civil Engineering Department, Kyushu Institute of Technology, Kitakyushu, Japan. fujisaki@msh.biglobe.ne.jp

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|February 3, 2005
PubMed
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Residual turbulence from turbidity currents significantly impacts fine particle settling in circular tanks. This effect, especially pronounced with lower densimetric Froude numbers, reduces overall sediment removal efficiency.

Area of Science:

  • Environmental Engineering
  • Fluid Dynamics
  • Sediment Transport

Background:

  • Turbidity currents are crucial in settling tank performance.
  • Understanding their impact on sediment settling is vital for efficient water treatment.

Purpose of the Study:

  • To investigate the unique properties of turbidity currents in circular settling tanks.
  • To analyze the effect of residual turbulence on fine particle settling and removal ratios.

Main Methods:

  • Development of a mathematical model incorporating a k-epsilon turbulence model.
  • Simulation of turbidity currents and sediment transport dynamics within a circular tank.

Main Results:

  • Turbulence persists after sediment settling, affecting finer particles.

Related Experiment Videos

  • Lower densimetric Froude numbers amplify residual turbulence, decreasing removal ratios.
  • Settling velocity influences sediment transport dynamics and boundary layer development.

    • Conclusions:

    • Residual turbulent diffusivity is a key factor in settling tank efficiency.
    • Optimizing settling tank design requires considering residual turbulence effects.
    • The study provides insights into density-affected settling tank performance and removal ratios.