Rotating vane rheometry — a review

Barnes, Howard A.; Nguyen, Q. Dzuy

doi:10.1016/s0377-0257(01)00095-7

Cited by 372 publications

(250 citation statements)

References 58 publications

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“…Since slip could seriously affect our measurements, we paid special attention to this issue. Two techniques are classically used to avoid or reduce slip: roughening or coating the walls [51,52]. Another technique involves shearing the material with a vane (a shaft equipped with four or six blades) [51].…”

Section: Rheometrymentioning

confidence: 99%

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

Cochard

Ancey

2009

Journal of Non-Newtonian Fluid Mechanics

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a b s t r a c tWe report experimental results related to the dam-break problem for viscoplastic fluids. Using image processing techniques, we were able to accurately reconstruct the free-surface evolution of fixed volumes of fluid suddenly released a plane. We used Carbopol Ultrez 10 as a viscoplastic material; its rheological behavior was closely approximated by a Herschel-Bulkley model for a fairly wide range of shear-rates. Varying the Carbopol concentration allowed us to change the yield stress and bulk viscosity. The yield stress ranged from 78 to 109 Pa, producing Bingham numbers in the 0.07-0.35 range. We investigated the behavior of a 43-kg mass released on a plane, whose inclination ranged from 0 • to 18 • . For each run, we observed that the behavior was nearly the same: at short times, the mass accelerated vigorously on gate opening and very quickly reached a nearly constant velocity. At time t = 1 s, independently of plane inclination and yield stress, the mass reached a near-equilibrium regime, where the front position varied as a power function of time over several decades. We did not observe any run-out phase, during which the mass would have gradually come to a halt. The similarity in the flow behavior made it possible to derive an empirical scaling for the front position in the form x f = t 0.275(sin˛) 1/3 (sin˛) 5/4 , where˛and t denote plane inclination and time, respectively, and which holds for sloping beds (˛> 0).

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Section: Rheometrymentioning

confidence: 99%

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

Cochard

Ancey

2009

Journal of Non-Newtonian Fluid Mechanics

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“…The reason for employing a vane spinner as the rotor is that the vane-cup system causes much less error when testing large particles, has less impact on the slurry structure, and therefore, offers more consistent results. 13 Pump selection for handling slurries for industry applications is based on rheological data that are obtained from slurry rheology tests. The crucial parameters for pump selection are shear stress at certain shear rates, viscosity of the slurry, yield point, and settlement rate of the slurry.…”

Section: Pretreatment Of Biomass Slurrymentioning

confidence: 99%

Rheological Study of Comingled Biomass and Coal Slurries with Hydrothermal Pretreatment^†

He¹,

Park²,

Norbeck³

2009

Energy Fuels

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Gasification of comingled biomass and coal feedstock is an effective means of reducing the net life cycle greenhouse gas emissions in the coal gasification process while maintaining its inherent benefits of abundance and high-energy density. However, feeding a comingled biomass and coal feedstock into a pressurized gasification reactor poses a technical problem. Conventional dry feeding systems, such as lock hoppers and pressurized pneumatic transport, are complex and operationally expensive. A slurry formation of comingled biomass and coal feedstock can be easily fed into the gasification reactor but, in normal conditions, only allows for a small portion of biomass in the mixture. This is a consequence of the hydroscopic and hydrophilic nature of the biomass. The College of Engineering Center for Environmental Research and Technology (CE-CERT) at the University of California, Riverside, has developed a process producing high solid content biomass-water slurry using a hydrothermal pretreatment process. In this paper, the systematic investigation of the rheological properties (e.g., shear rate, shear stress, and viscosity) of coal-water slurries, biomass-water slurries, and comingled biomass and coal-water slurries is reported. The solid particle size distribution in the slurry and the initial solid/water ratio were investigated to determine the impact on shear rate and viscosity. This was determined using a rotational rheometer. The experimental results show that larger particle size offers better pumpability. The presence of a high percentage of biomass in solid form significantly decreases slurry pumpability. It is also shown that the solid loading of the biomass-water slurry can be increased to approximately 35 wt % with viscosity of less than 0.7 Pa 3 s after the pretreatment process. The solid loading increased to approximately 45 wt % when the biomass is comingled with coal.

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“…Most of the rheological measurements were made using a stress controlled Haake RS150 rheometer at 20°C. To avoid slipping at the walls, a four blades vane geometry and a grooved stator were used [34]. The suspensions were first pre-sheared at 1000 s −1 for a few minutes and then left at rest until no more settling was observed (about 30 minutes for a typical cement suspension).…”

Section: Cementmentioning

confidence: 99%

Cement-Polymer Composites for Oilwell Cementing

Chougnet

Audibert‐Hayet

Moan

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Composites ciment-polymère pour la cimentation des puits pétroliers -La durabilité des matériaux utilisés pour les sondages pétroliers est une question essentielle pour garantir l'étanchéité à long terme des puits. Des composites ciment/polymère présentent de bonnes propriétés mécaniques et de durabilité : il est en effet connu que l'ajout de latex améliore l'adhésion ou la flexibilité des pâtes de ciment durcies. Ainsi, des composites ciment/polymère apparaissent comme de bons matériaux de cimentation de puits dans des environnements sévères. Lors de la construction d'un puits, le placement du laitier de ciment dépend très fortement de ses propriétés rhéologiques. Dans cet article, nous avons étudié les propriétés rhéologiques de suspensions composites à base de ciment et de poudre de polymère : nous montrons que sous cisaillement oscillatoire, ces suspensions présentent une transition d'un état gélifié vers un état de type liquide. Le remplacement d'une partie des particules de ciment par des particules de polymère induit une baisse du module de conservation de l'état gel. La bonne dispersion des particules de polymères et leur forte affinité pour les grains de ciment ont été observées par microscopie électronique. Des expériences de spectroscopie RMN et de calorimétrie ont mis en évidence une influence de l'addition de particules de polymères sur les mécanismes d'hydratation et de durcissement de la matrice cimentaire. L'ensemble des résultats acquis a amélioré notre compréhension des relations entre la composition du coulis, son comportement rhéologique et les propriétés du matériau durci, ce qui nous a permit de formuler de nouveaux matériaux de cimentation. Abstract -Cement-Polymer Composites for Oilwell Cementing -The selection of an optimal cementitious material is critical to maintain zonal isolation for the lifetime of oil & gas or gas

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Rotating vane rheometry — a review

Cited by 372 publications

References 58 publications

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

Rheological Study of Comingled Biomass and Coal Slurries with Hydrothermal Pretreatment^†

Cement-Polymer Composites for Oilwell Cementing

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Rotating vane rheometry — a review

Cited by 372 publications

References 58 publications

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

Rheological Study of Comingled Biomass and Coal Slurries with Hydrothermal Pretreatment†

Cement-Polymer Composites for Oilwell Cementing

Contact Info

Product

Resources

About

Rheological Study of Comingled Biomass and Coal Slurries with Hydrothermal Pretreatment^†