Rheological behaviour of multiphase slurries for combustion applications

Skarvelakis, C.; Antonini, G.

doi:10.1016/s0016-2361(96)00166-4

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…A linear shear stress−shear rate relationship with an initial shear stress threshold is found for both of the surfactants. This clearly indicates non-Newtonian , characteristics of the water suspension of the coal samples in the weight concentration range of 55−64.8%. The linear plot with an initial intercept as shown in a representative plot (panels a−c of Figure ) also indicates that these fluids belong to Bingham plastic fluids obeying eq τ = τ 0 + γ η where τ and γ denote shear stress and applied shear rate, respectively.…”

Section: Resultsmentioning

confidence: 71%

Effect of Organized Assemblies. Part 5: Study on the Rheology and Stabilization of a Concentrated Coal−Water Slurry Using Saponin of the Acacia concinna Plant

et al. 2009

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The present work involves the preparation of a highly concentrated coal-water slurry employing three different low-rank coals of Indian origin having variable ash content. The formulation, rheology, and stabilization of the slurry have been investigated using saponin extracted from the seeds and pericarps (mods) of the Acacia concinna plant as a dispersant. The saponins extracted from both the seeds and pericarps of the plant are found to stabilize the slurry. The rheological characteristics of the slurry have been analyzed by varying pH and coal loading in the presence and absence of saponin. The coal-water slurry follows the Bingham plastic model and behaves as a non-Newtonian fluid in the presence of saponin. The stabilization of the coal-water slurry has been attributed primarily to the diminution of the coal particle-particle interaction because of steric hindrance offered by adsorbed saponin. The measurements of ζ potential, yield stress, and viscosity of coal in the presence of saponin further provide evidence to this effect.

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Section: Resultsmentioning

confidence: 71%

Effect of Organized Assemblies. Part 5: Study on the Rheology and Stabilization of a Concentrated Coal−Water Slurry Using Saponin of the Acacia concinna Plant

et al. 2009

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“…14 In the presence of both surfactants, the fly ash–water slurry shows a linear relation between shear stress and shear rate with an early shear yield stress value, indicating a non-Newtonian Bingham plastic fluid in a solid weight fraction range of 50–64%. 27,28 The slurry follows the equation of the Bingham plastic modelwhere γ and τ indicate the applied shear rate and shear stress, respectively. τ 0 is the yield stress, and η is defined as the Bingham viscosity.…”

Section: Resultsmentioning

confidence: 99%

“…On the measurement of shear stress, varying the shear rate of the fly ash–water slurry containing different solid weight ratios of fly ash in the presence of 0.017 g/ cc saponin, we have compared the flow characteristic of slurry with CTAB, a commercial dispersant . In the presence of both surfactants, the fly ash–water slurry shows a linear relation between shear stress and shear rate with an early shear yield stress value, indicating a non-Newtonian Bingham plastic fluid in a solid weight fraction range of 50–64%. , The slurry follows the equation of the Bingham plastic model where γ and τ indicate the applied shear rate and shear stress, respectively. τ 0 is the yield stress, and η is defined as the Bingham viscosity.…”

Section: Resultsmentioning

confidence: 99%

Stabilization and Rheological Behavior of Fly Ash–Water Slurry Using a Natural Dispersant in Pipeline Transportation

Das¹,

Pattanaik

Parhi

et al. 2019

ACS Omega

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Effective transportation of fly ash–water slurry through a pipeline from its generation site, a power plant, to a storage site by replacing commercial surfactants such as cetyl trimethyl ammonium bromide and sodium dodecyl sulfate by a natural dispersant extracted from Sapindus laurifolia was studied. The stability of fly ash slurry was determined from its rheological parameters, dispersant concentration, and stabilization mechanism. From surface tensiometric data, the critical micelle concentration of the dispersant was obtained to be 0.017 g/cc. The stabilization of high-concentration fly ash slurry has been studied through its rheological behavior by variation of temperature and dispersant and ash concentration. The rheological result obtained for fly ash concentrations in the range of 50–65% slurry was best justified by the Bingham plastic model. The wettability of fly ash particles is increased in the presence of dispersants, which is inferred from reduction of the surface tension value. The stabilization mechanism of the slurry is explained by a steric factor as indicated by the decrease in the zeta potential value. Air pollution is minimized at its destination site due to agglomeration of fly ash particles, which is confirmed from the SEM microphotograph.

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Rheology and thixotropic properties of slurry fuel prepared using municipal wastewater sludge and coal

Liu

Wang

Gao

et al. 2012

Chemical Engineering Science

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Rheological behaviour of multiphase slurries for combustion applications

Cited by 4 publications

References 2 publications

Effect of Organized Assemblies. Part 5: Study on the Rheology and Stabilization of a Concentrated Coal−Water Slurry Using Saponin of the Acacia concinna Plant

Effect of Organized Assemblies. Part 5: Study on the Rheology and Stabilization of a Concentrated Coal−Water Slurry Using Saponin of the Acacia concinna Plant

Stabilization and Rheological Behavior of Fly Ash–Water Slurry Using a Natural Dispersant in Pipeline Transportation

Rheology and thixotropic properties of slurry fuel prepared using municipal wastewater sludge and coal

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