A rheological model for a liquid-gas foam

Calvert, J.R.; Nezhati, K.

doi:10.1016/0142-727x(86)90016-0

Cited by 54 publications

(30 citation statements)

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“…The slip velocity profile consists of shear profiles near the perpendicular walls and plug flow profiles along the center. The shape of the slip velocity profile is consistent with non-curing foam systems [Calvert 1990, Calvert and Nezhati 1986, Kraynik 1988. The decrease of the average slip velocity is the result of a decreased availability of the blowing agent and the increase in viscosity due to polymerization and increasing gas volume fraction.…”

Section: Discussionsupporting

confidence: 56%

Experiments for foam model development and validation.

Bourdon¹,

Cote²,

Moffat³

et al. 2008

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A series of experiments has been performed to allow observation of the foaming process and the collection of temperature, rise rate, and microstructural data. Microfocus video is used in conjunction with particle image velocimetry (PIV) to elucidate the boundary condition at the wall. Rheology, reaction kinetics and density measurements complement the flow visualization. X-ray computed tomography (CT) is used to examine the cured foams to determine density gradients. These data provide input to a continuum level finite element model of the blowing process.4

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Section: Discussionsupporting

confidence: 56%

Experiments for foam model development and validation.

Bourdon¹,

Cote²,

Moffat³

et al. 2008

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“…Some authors have tried to evaluate this thin film thickness and the wall slip velocity variation with this thickness (Enzendorfer et al, 1995;Thondavadi and Lemlich, 1985). According to Nezhati (1986 and, there is a correlation between this thin liquid film thickness and foam quality, the slip layer thickness being larger for smaller qualities; but as a first approximation, they find this film thickness to be independent of average bubble size.…”

Section: Wall Slip Velocitymentioning

confidence: 99%

“…Foam must be stable for at least measurements time. Bubbles size measurements and rheology measurements at the same time seems to be a necessity to numerous authors (Prud'homme and Khan, 1996;Nezhati, 1986 andHarris, 1983with Reidenbach, 1985 carried out a series of experimentations on foams and measured textures by an optical method or with a multichannel particles detector. Foam flows in a recirculating loop made of steel pipes, pressure drop over a certain distance being measured and rheological values being computed from these measurements.…”

Section: Foam Texture and Stabilitymentioning

confidence: 99%

Rheology of Aqueous Foams: a Literature Review of Some Experimental Works

Herzhaft

1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Rhéologie des mousses aqueuses : revue bibliographique de quelques travaux expérimentaux -La mousse étant un système dispersé et instable par nature, sa caractérisation rhéologique est délicate. De nombreux paramètres doivent être pris en compte et contrôlés : la qualité de la mousse (fraction volumique en gaz), sa texture (distribution en tailles de bulles), la taille de l'appareil de mesure par rapport à la taille des bulles, l'influence du mode de formation, le glissement aux parois et la compressibilité de la mousse. D'autre part, la mousse doit être stable et ne pas évoluer dans les conditions de la mesure. Ces nombreux paramètres expliquent qu'il n'y ait pas, à l'heure actuelle, de consensus concernant le comportement de ce type de système. L'influence de la pression et de la température (ne serait-ce que sur le comportement en statique de la mousse) est très peu étudiée. Une étude expérimentale rigoureuse doit prendre en compte et contrôler tous les paramètres influençant la stabilité et la structure de la mousse.

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“…However, there is very little information available about the rheological behaviour of three phase flotation froth. Researchers have reported Pseudo-plastic for two-phase foam systems [16,17]. As a flotation froth is a three-phase system (liquid-gas-solid), its rheological behaviour may be different to that of foam.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

Farrokhpay

Runge

et al. 2016

Powder Technology

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Determining the significance of flotation variables on froth rheology using a central composite rotatable design, Powder Technology (2015Technology ( ), doi: 10.1016Technology ( /j.powtec.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractFroth performance in a flotation cell is expected to be affected by froth rheology due to change in the froth transportation rate. However, very little study has been performed to investigate how froth rheology responds to flotation variables. This paper presents an experimental program performed to study the effects of flotation variables (i.e. feed grade, feed particle size, froth height, superficial gas velocity and impeller speed) on the froth rheology. These conditions were varied using a central composite rotatable design (CCRD).

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A rheological model for a liquid-gas foam

Cited by 54 publications

References 1 publication

Experiments for foam model development and validation.

Experiments for foam model development and validation.

Rheology of Aqueous Foams: a Literature Review of Some Experimental Works

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

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