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Small scale model for CFD validation in DAF application.

J Hague1, C T Ta, M J Biggs

  • 1Thames Water Group Research and Development, Kempton Park R&D Centre, Feltham Hill Road, Hanworth, TW13 6XH, UK.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 8, 2001
PubMed
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Dissolved air flotation (DAF) flow patterns were measured using laser Doppler velocimetry (LDV). Vertical flow recirculation and secondary flow were observed, aiding in computational fluid dynamics (CFD) model validation.

Area of Science:

  • Fluid dynamics
  • Chemical engineering

Background:

  • Dissolved air flotation (DAF) is a crucial process in water treatment.
  • Understanding flow patterns is essential for optimizing DAF efficiency.
  • Accurate velocity measurements are needed to validate computational models.

Purpose of the Study:

  • To measure generic flow patterns in a laboratory dissolved air flotation (DAF) model.
  • To obtain non-invasive, high-resolution velocity data for single-phase and two-phase systems.
  • To compare experimental data with preliminary computational fluid dynamics (CFD) models.

Main Methods:

  • Utilized a Perspex laboratory model for dissolved air flotation (DAF).
  • Employed laser Doppler velocimetry (LDV) for non-invasive flow velocity measurements (+/- 2 mm s-1).

Related Experiment Videos

  • Conducted measurements in both single-phase (water) and two-phase (air-saturated water) systems.

    • Main Results:

    • Observed vertical flow recirculation in the flotation zone.
    • Identified secondary flow recirculation near the riser in the two-phase system.
    • Noted apparent cross-tank flow movement, potentially due to bubble cloud dispersion.
    • Found that a k-epsilon turbulence model in CFD showed better agreement with single-phase data than a laminar model.

    Conclusions:

    • Experimental velocity data were successfully obtained for DAF systems.
    • The study provides valuable data for verifying two-phase CFD models of DAF.
    • CFD models incorporating turbulence are more accurate for simulating DAF flow patterns.