CFD Modelling and Experimental Investigation of Bimodal Slurry Flow in Horizontal Pipeline and Bends

Singh, Kanwar Pal; Kumar, Arvind; Kaushal, D. R.

doi:10.1007/978-981-13-6416-7_32

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…Almost all CFD codes apply extensions of single-phase solving procedures, leading to diffusive or unstable solutions, and require very short time-steps. Considering these apparent limitations in CFD modelling and simulation, the present work has been undertaken to systematically develop a CFD based model to predict the pressure drop in slurry pipeline [25][26][36][37][38][39][40][41][42][43][44][45]. The density of slurry can vary from 2500-3600 kg/m 3 depending upon the grade of iron ore.…”

Section: Cfd and Flow Simulationmentioning

confidence: 99%

CFD Analysis of Pressure Variation inside Iron-Ore Slurry Pipelines

Mishra¹,

Sahoo²

2023

IJRASET

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Slurries, basically regarded as two – phase (solid – liquid) mixtures of ore and the carrier medium, generally water, are transported through underground pipelines. The rheological properties of the slurry also play an important role in determining the salient parameters of hydraulic transport such as head loss and pressure drop in commercial slurry pipelines. CFD has provided an upper hand in mathematical modelling and flow simulation, as it provides accurate and dependable flow simulation results. This article primarily focuses on determining the pressure drop across the ends of the pipeline, as slurry flows through it, and to establish a graphical depiction of the various simulations made using different set of conditions. The pressure drop for R500 radius of curvature of bends was found to be lying between 4.27% to 6.53%, as the bend angles increased from 3° to 18°, while the same was found to be lying between 3.49% to 6.2% for R2500 radius of curvature of bends. The pressure drop for R500 radius of curvature of bends was found to be lying between 4.91% to 8.3%, as the inlet velocity of slurry increased from 0.5 m/s to 3m/s, while the same was found to be lying between 5.05% to 8.63% for R2500 radius of curvature of bends.

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Section: Cfd and Flow Simulationmentioning

confidence: 99%

CFD Analysis of Pressure Variation inside Iron-Ore Slurry Pipelines

Mishra¹,

Sahoo²

2023

IJRASET

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“…Therefore, by applying the change owing to an increase in continuous velocity occurring along the boundary of the bottom of the conduit, the shear flow velocity and shear stress in transfer deposition can be calculated. If y increases discontinuously at a certain calculation point, ∂u/ ∂z in Equation (10) increases infinitely [56][57][58][59][60][61]. This frictional resistance is proportional to the flow velocity and inversely proportional to the cross-sectional area of the pipe.…”

Section: Analysis Of the Flow Boundary Layer In Stormwater Pipesmentioning

confidence: 99%

Numerical Assessment of Shear Boundary Layer Formation in Sewer Systems with Fluid-Sediment Phases

Yangho

Joo

Lee

et al. 2020

Water

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Numerical and empirical studies of soil slurry transport and deposition in urban stormwater sewers are few, presumably due to the difficulty of direct observation of soil slurry flow in stormwater pipes. Slurry in a sewer system includes both suspended load and bedload, but few studies have attempted to demarcate these two components. A boundary layer is a crucial determinant of sediment transport capacity. Stormwater runoff enters the sewer in turbulent flow, mostly mixed with soil slurry generated by rainfall. In this paper, we attempt analysis using ANSYS Fluent commercial CFD software. We describe the development of a numerical analytical methodology capable of predicting the flow of soil slurry in stormwater pipes, and propose a method for estimating the sediment–flow boundary layer. Using this model, we simulated stormwater runoff with a large content of soil slurry during a rainfall event. We investigated soil slurry transport and predict the formation of shear boundary layer by varying the inlet conditions (volume of soil slurry entering the stormwater sewer system) and by analyzing the flow velocity field and soil slurry volume fraction in the pipes under various experimental flow conditions. Based on the shear and settling velocity of sediment particles, we propose criteria for the formation of a shear boundary layer in stormwater pipes.

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“…Kumar et al (2016, 2018) and Gopaliya and Kaushal (2015, 2016) predicted the slurry behavior by comparing the CFD modeling results with the experimental data at higher concentrations for various slurry samples. Singh et al (2019) focused their study on the effect of shear rate and solid concentration on rheological properties of bimodal slurry.…”

Section: Literature Reviewmentioning

confidence: 99%

Pressure drop calculation for fly ash slurry using rheological model

Singh

Kumar

Kaushal

2019

WJE

Self Cite

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Purpose This paper aims to the transportation of high concentration slurry through pipelines that will require thorough understanding of physical and rheological properties of slurry, as well as its hydraulic flow behavior. In spite of several contributions by the previous researchers, there is still a need to enrich the current understanding of hydraulic conveying through pipeline at various flow parameters. The pilot plant loop tests, particularly at high concentrations, are tedious, time-consuming and complex in nature. Therefore, in the current research the prediction methodology for slurry pipeline design based on rheological model of the slurry is used for calculation of pressure drop and other design parameters. Design/methodology/approach It has been established that slurry rheology plays important role in the prediction of pressure drop for laminar and turbulent flow of commercial slurries through pipeline. In the current research fly ash slurry at high concentration is chosen for rheological analysis. The effect of particle size and solid concentration is experimentally tested over the rheological behavior of slurry and based on the rheological data a correlation is developed for calculation of pressure drop in slurry pipeline. Findings The present study strongly supports the analytical approach of pressure drop prediction based on the rheological parameters obtained from the bench scale tests. The rheological properties are strongly influenced by particle size distribution (PSD), shear rate and solid mass concentration of the slurry samples. Pressure drop along the pipeline is highly influenced by flow velocity and solid concentration. The presence of coarser particles in the slurry samples also leads to high pressure drop along the pipeline. As the concentration of solid increase the shear stress and shear viscosity increase cause higher pressure drop. Research limitations/implications The transportation of slurry in the pipeline is very complex as there are lot of factors that affect the flow behavior of slurry in pipelines. From the vast study of literature it is found that flow behavior of slurry changes with the change in parameters such as solids concentration, flow velocity, PSD, chemical additives and so on. Therefore, the accurate prediction of hydraulic parameter is very difficult. Different slurry samples behave differently depending upon their physical and rheological characteristics. So it is required to study each slurry samples individually that is time-consuming and costly. Practical implications Nowadays in the world, long distance slurry pipelines are used for the transportation of highly concentration slurries. Many researchers have carried out an experiment in the design aspects of hydraulic transportation system. Rheological characteristics of slurry also play crucial role in determining important parameters of hydraulic conveying such as head loss in commercial slurry pipeline. The current research is useful for the prediction of pressure drop based on rheological behavior of fly ash slurry at various solid concentrations. The current research is helpful for finding the effect of solid concentration and flow velocity on the flow behavior of slurry. Social implications Slurry pipeline transportation has advantages over rail and road transportation because of low energy consumption, economical, less maintenance and eco-friendly nature. Presently majority of the thermal power plants in India and other parts of the world dispose of coal ash at low concentration (20 per cent by weight) to ash ponds using the slurry pipeline. Transporting solids in slurry pipelines at higher concentrations will require a thorough knowledge of pressure drop. In the current research a rheological model is proposed for prediction of pressure drop in the slurry pipeline, which is useful for optimization of flow parameters. Originality/value All the experimental work is done on fly ash slurry samples collect from the Jharli thermal power plant from Haryana State of India. Bench scale tests are performed in the water resource laboratory of IIT Delhi for physical and rheological analysis of slurry. It has been shown in the results that up to solid concentration of 50 per cent by mass all the samples behave as non-Newtonian and follows a Herschel–Bulkley model with shear thickening behavior. In the present research all the result outcomes are unique and original and does not copied from anywhere.

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CFD Modelling and Experimental Investigation of Bimodal Slurry Flow in Horizontal Pipeline and Bends

Cited by 6 publications

References 5 publications

CFD Analysis of Pressure Variation inside Iron-Ore Slurry Pipelines

CFD Analysis of Pressure Variation inside Iron-Ore Slurry Pipelines

Numerical Assessment of Shear Boundary Layer Formation in Sewer Systems with Fluid-Sediment Phases

Pressure drop calculation for fly ash slurry using rheological model

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