Experimental analysis of coagulation of particles under low-shear flow

Experimental analysis of coagulation of particles under low-shear flow

7 pages, 3 figures

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Main Authors: Colomer, Jordi, Peters, Francesc, Marrasé, Cèlia
Format: artículo biblioteca
Language:English
Published: Elsevier 2005-07-05
Subjects:Particle coagulation, Concentration, Shear, Oscillating grid, Orbital shaker, Turbulence,
Online Access:http://hdl.handle.net/10261/15727
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spelling dig-icm-es-10261-157272020-11-10T09:54:23Z Experimental analysis of coagulation of particles under low-shear flow Colomer, Jordi Peters, Francesc Marrasé, Cèlia Particle coagulation Concentration Shear Oscillating grid Orbital shaker Turbulence 7 pages, 3 figures The aggregation and breakup of particle flocs were investigated by monitoring the size distribution of a suspension of aggregates, with diameter do, under shear flow created by two mixing systems. The aggregation behavior was studied in 63 experiments under various conditions of induced shear rate and particle volume concentration for particle aggregates smaller than the Kolmogorov scale. Despite small shear rates being characteristics of natural systems, only experiments with comparatively high shear rates have been conducted to date. Because of this reason, in this study, the shear rates were chosen to mimic those found in natural systems. In the first set of experiments the aggregate size, d, was analyzed by changing the mean shear, overbar-G (ranging from 0.70 to 27.36 s-1) created in a tank with a grid oscillating through the whole suspension volume. In the second set of experiments, a spherical flask was placed in an orbital shaking table where overbar-G ranged from 0.45 to 2.40 s-1. In all the cases there was an increase of d at increasing overbar-G. The dependence on d was found to be identical for the particle volume concentrations investigated, Φ = 0.2, 0.8, 2, 4, 6, 8 and 10 × 10-5, with the stable aggregate size shifting towards aggregate growth as particle volume concentration increased. These results demonstrate that shear provided a means to keep the particle number count high for collisions to occur but it is small enough that the aggregation-breakup balance is dominated by aggregation Research funding throughout this study was provided to Jordi Colomer by the ‘Ministerio de Educación y Ciencia’ with projects CGL2004-02027/HID and PR2002-0113. Francesc Peters and Cèlia Marrasé acknowledge the European project NTAP (EVK3-CT-2000-00022) and the Spanish projects TURFI (REN2002-01591/MAR) and VARITEC (CTM2004-04442-C02/MAR). This is ELOISE contribution no. 515/40 Peer reviewed 2009-08-05T15:02:27Z 2009-08-05T15:02:27Z 2005-07-05 artículo http://purl.org/coar/resource_type/c_6501 Water Research 39(13): 2994-3000 (2005) 0043-1354 http://hdl.handle.net/10261/15727 10.1016/j.watres.2005.04.076 en https://doi.org/10.1016/j.watres.2005.04.076 none 180710 bytes application/pdf Elsevier
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Particle coagulation
Concentration
Shear
Oscillating grid
Orbital shaker
Turbulence
Particle coagulation
Concentration
Shear
Oscillating grid
Orbital shaker
Turbulence
spellingShingle Particle coagulation
Concentration
Shear
Oscillating grid
Orbital shaker
Turbulence
Particle coagulation
Concentration
Shear
Oscillating grid
Orbital shaker
Turbulence
Colomer, Jordi
Peters, Francesc
Marrasé, Cèlia
Experimental analysis of coagulation of particles under low-shear flow
description 7 pages, 3 figures
format artículo
topic_facet Particle coagulation
Concentration
Shear
Oscillating grid
Orbital shaker
Turbulence
author Colomer, Jordi
Peters, Francesc
Marrasé, Cèlia
author_facet Colomer, Jordi
Peters, Francesc
Marrasé, Cèlia
author_sort Colomer, Jordi
title Experimental analysis of coagulation of particles under low-shear flow
title_short Experimental analysis of coagulation of particles under low-shear flow
title_full Experimental analysis of coagulation of particles under low-shear flow
title_fullStr Experimental analysis of coagulation of particles under low-shear flow
title_full_unstemmed Experimental analysis of coagulation of particles under low-shear flow
title_sort experimental analysis of coagulation of particles under low-shear flow
publisher Elsevier
publishDate 2005-07-05
url http://hdl.handle.net/10261/15727
work_keys_str_mv AT colomerjordi experimentalanalysisofcoagulationofparticlesunderlowshearflow
AT petersfrancesc experimentalanalysisofcoagulationofparticlesunderlowshearflow
AT marrasecelia experimentalanalysisofcoagulationofparticlesunderlowshearflow
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