Turbulent Velocity in Flocculation by Means of Grids

Liem, L. E.; Smith, Daniel; Stanley, Stephen

doi:10.1061/(asce)0733-9372(1999)125:3(224)

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…Average shear rate, (G value), defined as average energy dissipation rate per unit volume of suspension, is typically utilized as the dominant parameter in the coagulation process. [2] Although criticized by some authors, [3][4][5] the G values combined with mixing times (t) are extensively adopted as an effectiveindex for designing and operating full-scale plants. [6] To adequately disperse the coagulant added into a suspension and thereby promote subsequent contact between particles, dissolved matter, and coagulant molecules, a high G value is usually employed during the coagulation stage, which is called the ''rapid mix'' stage.…”

Section: Introductionmentioning

confidence: 99%

Coagulation of Particles Through Rapid Mixing

et al. 2006

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As is often assumed, rapid mix effectively distributes the dosed coagulant in suspension to promote subsequent flocculation of suspended particles and coagulant molecules. This study determined that the role of rapid mix is considerably more complex than conventionally assumed. Particles in the raw water samples from the Banxing Water Works of Taipei City were coagulated at high shear environment, during which flocs of size 40-70 lm were produced. The produced floc interior was compacted, and residual turbidity and the amount of dissolved natural organic matter (NOM) in suspension were substantially reduced. The subsequent stage of rapid mix slightly reduces floc size, further compacts the floc interior, and expels fine particles and some adsorbed NOM from the flocs. A sudden reduction in shearing rate produced large sized flocs with not so compact structures. Moreover, this action released fine particles from flocs into the suspension and enhanced adsorption of NOM onto solid surfaces.

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Section: Introductionmentioning

confidence: 99%

Coagulation of Particles Through Rapid Mixing

et al. 2006

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“…The turbulence research community has essentially used biplane grids in wind tunnels to study the behavior of homogeneous isotropic turbulence (see Comte-Bellot and Corrsin, 1966). Environmental engineers have also used biplane grids to affect mixing in fluids (see Liem and Smith, 1999). For a study of homogeneous turbulence in a wind tunnel, Tucker and Ali (1976) have used a perforated sheet instead of a biplane grid.…”

Section: Turbulence and Mixing From A Biplane Gridmentioning

confidence: 99%

Use of Biplane Grids for On-site Studies of Hurricanes

Ali

2008

MAS

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For the interactive study of a hurricane after its landfall, a fleet of remotely operated, identical vehicles is proposed to be stationed in its path. Each vehicle would support two biplane grids placed parallel to one another. The positions and orientations of the vehicles would be remotely controlled to steer the frontal area of each grid to be nearly perpendicular to the wind's direction. The paper discusses the expected role of the grids in affecting the mixing of different flow regimes of the hurricane and the decay of its power.

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On the efficiency of turbulent mixing in rotating stirrers

Trivellato

2011

Chemical Engineering and Processing: Process Intensification

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Turbulent Velocity in Flocculation by Means of Grids

Cited by 9 publications

References 25 publications

Coagulation of Particles Through Rapid Mixing

Coagulation of Particles Through Rapid Mixing

Use of Biplane Grids for On-site Studies of Hurricanes

On the efficiency of turbulent mixing in rotating stirrers

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