Experimental Investigation and Optimization of Solid Suspension in Non-Newtonian Liquids at High Solid Concentration

Mollaabbasi, Roozbeh; Najmabad, Javad Mohebbi

doi:10.18869/acadpub.jafm.68.235.24814

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…Thus, the low pressure region developed near the free liquid surface and higher vortex and turbulent activity on the air side of the interface control the surface aeration process in the reactor vessels. This in turn provides localized mixing conditions which are suitable for lifting the solids and subsequent suspension of the same (Mollaabbasi and Najmabad, 2016) in the liquid contained within the reactor vessel. Similarly, High-C generates superior turbulence action near the free liquid surface of the reactor vessel.…”

Section: Physical Reasons For Variations In the Performance Character...mentioning

confidence: 99%

Physical Reasoning of Double- to Single-Loop Transition in Industrial Reactors using Computational Fluid Dynamics

Iyer

Patel²

2022

JAFM

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Double- to single-loop pattern transition and a significant reduction in the power number with a decrease in the clearance of the Rushton turbine impeller in a baffled reactor was elucidated in earlier research works. The present work investigates the physical reasons behind these phenomena using the computational fluid dynamics approach. The Reynolds Averaged Navier–Stokes equations with standard turbulence model closure were used to model the turbulent flow conditions in the reactor vessels. The Multiple Reference Frame (MRF) approach was adopted to model the impeller baffle interactions in the reactor vessels. The implicit Volume of Fluid (VOF) method was employed to simulate the aeration process in the reactor configurations considered. The development of a low pressure region below the impeller of a low clearance vessel deflects the discharge streams downward, leading to the formation of a single-loop pattern. The downward movement of the discharge streams reduces the vortex activity behind the impeller blades, leading to weaker form drag and a decrease in the power number of the impeller. Similarly, a high clearance vessel provides a low pressure region above the impeller which deflects the discharge streams above the impeller, resulting in a single-loop pattern and a considerable increase in the air entrainment due to superior vortex and turbulence activity present near the free liquid surface. The standard reactor vessel was found to provide superior bulk mixing of fluid as the overall turbulent dissipation rate is 35% more than that associated with low and high clearance vessels.

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Section: Physical Reasons For Variations In the Performance Character...mentioning

confidence: 99%

Physical Reasoning of Double- to Single-Loop Transition in Industrial Reactors using Computational Fluid Dynamics

Iyer

Patel²

2022

JAFM

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“…The main elements of ANOVA table are source of variance, sum of squares, degrees of freedom, mean square, F ratio, and the probability associated with the F ratio Gopalakannan (2013), Forghany 2017and Mollaabbasi (2016).…”

Section: Analysis Of Variance (Anova)mentioning

confidence: 99%

Optimization of Abrasive Water Jet Cutting Parameter for AISI 316L Stainless Steel Sheet

2017

JAFM

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Abrasive water jet cutting is a advanced manufacturing process to be used cut various type of material economically. The width of AWJC or kerf width is affected by Abrasive flow rate, cutting speed and stand of distance as well as the work-piece material. In this present work AWJC of stainless steel AISI 316L 2mm thickness has been investigated. Design of experiment was implemented by to applying the full factorial design method. In this work to relate the top kerf width and bottom kerf width and the above process parameters. Mathematical models were developed to evaluate the relationship between the process parameters and the top and bottom kerf width. Also, process parameters effects on the edge quality have been defined. Finally, the numerical optimization has been used to found the optimal AWJC conditions at which the highest edge quality like top and bottom kerf width can be achieved.

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“…Limited information is available on the solid-liquid mixing in viscoelastic fluids. To the authors' knowledge, the few existing studies are limited to the critical impeller speed required for particle drawdown and to the liquid phase mixing times [14,15].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the solid-liquid separation in a stirred tank owing to viscoelasticity

et al. 2020

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In this study, we investigated the motion of solid particles dispersed in highly viscous complex fluids agitated in a stirred vessel. We used a refractive index matching method and a combination of planar laser-induced fluorescence (PLIF), particle image velocimetry (PIV), and particle-tracking velocimetry (PTV) techniques to measure the velocity fields of the solid and fluid phases simultaneously along with the spatiotemporal distribution of the solids in the tank. The experimental data show that in a Newtonian ambient fluid, particles disperse uniformly in the plane of measurement, while in a strongly shear-thinning viscoelastic ambient fluid they tend to accumulate in the core of the vortices formed in the flow domain. We found that the solids migrate to the core of the vortices also when the ambient fluid is a Boger fluid, i.e., viscoelastic but not shear thinning. The effect of the first normal stress difference, N1, on the vortex sizes and circulation intensities was also examined, with both properties decreasing for increasing N1. Finally, we observed that the clustering time of the solids in the vessel for viscoelasticity-induced migration was at least three orders of magnitude lower than that obtained from the literature for inertia-induced migration.

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Experimental Investigation and Optimization of Solid Suspension in Non-Newtonian Liquids at High Solid Concentration

Cited by 3 publications

References 25 publications

Physical Reasoning of Double- to Single-Loop Transition in Industrial Reactors using Computational Fluid Dynamics

Physical Reasoning of Double- to Single-Loop Transition in Industrial Reactors using Computational Fluid Dynamics

Optimization of Abrasive Water Jet Cutting Parameter for AISI 316L Stainless Steel Sheet

Experimental investigation of the solid-liquid separation in a stirred tank owing to viscoelasticity

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