Particulate Motion and Concentration Fields in Centrifugal Slurry Pumps

Pagalthivarthi, Krishnan V.; Desai, Prateen V.; Addie, Graeme

doi:10.1080/02726359008906557

Cited by 20 publications

(9 citation statements)

References 6 publications

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“…This section discusses the expressions used to obtain the concentration-modified eddy viscosities. For a rationale for these expressions, see Ravichandra et al (2004); Shook (1984a, 1984b); Pagalthivarthi et al (1990) and Pagalthivarthi and Ramanathan (2004).…”

Section: Effective Viscosities For Pcevmmentioning

confidence: 99%

“…Both these interactions are incorporated in the concentration-modified eddy viscosity model (e.g., Shook, 1984, Soo, 1984). Thus, mixing-length based concentration-modified models have been successfully employed to compute quasi three-dimensional two-phase flow in pump casings (Pagalthivarthi et al, 1990), concentration distribution in impellers Reinhardt, 1980, Zhong andLai, 1992), free surface flow in rotating channels (Ramanathan, 2001;Pagalthivarthi and Ramanathan, 2004), and recently in multi-size particulate flow in stationary channel (Ravichandra et al, 2005) and pipelines (Ravichandra et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Multi-Size Particulate Flow through Rotating Channel — Modeling and Validation Using Three Turbulence Models

Gupta¹,

Pagalthivarthi

2009

The Journal of Computational Multiphase Flows

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A comparison of three turbulence models in modeling and validating dense multi-size particulate flow through rotating channel is presented. All the three turbulence models incoporate a rotation modification to the production term in the turbulent kinetic energy equation. In the first model, rotation-modified k-ε equations are used to compute the eddy viscosity of pure carrier which is then modified for the presence of particles. In the other two models, rotation-modified k m-ε m equations are solved for the mixture directly. The eddy viscosities are then computed from k m and ε m. The predicted results of all three models show excellent mesh independence. The coarsest mesh satisfied the mass conservation to within 0.1%. The code based on pure carrier-phase eddy viscosity (modified for concentration) is computationally 2-3 times more efficient than the other two (mixture-based) models. The predicted results using all three turbulence models are compared against applicable experimental results in the open literature. Regression between the computed and experimental results shows excellent agreement between the two.

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Section: Effective Viscosities For Pcevmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-Size Particulate Flow through Rotating Channel — Modeling and Validation Using Three Turbulence Models

Gupta¹,

Pagalthivarthi

2009

The Journal of Computational Multiphase Flows

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“…Since the concentration field and solids velocity field are mutually related, an iterative solution alternating between these two fields is employed. Pagalthivarthi et al [4] and Visintainer et al [5] extend these ideas to a quasi-3D model to compute solid-liquid flow field in any specified radial cross section of the pump.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Prediction of Multi-Size Particulate Flow Through Three-Dimensional Pump Casing

Pagalthivarthi¹,

Furlan²,

Visintainer³

2015

Volume 1: Symposia

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Flow through centrifugal pump casing is highly complex in nature due to the complex geometry of the casing. While simplified two dimensional modeling of pump casing reveals the overall flow pattern and pressure distribution, a complete 3D model of pump casing is essential to fully capture the interaction of the primary main stream flow and the secondary flows especially in areas of heavy recirculation. This paper presents steady state finite element simulation of multi-size particulate slurry flow through three dimensional pump casing. The flow field and concentration distribution is presented for different cross-sectional planes. The multi-size particulate flow simulation results are compared with two mono-size particle simulations using (1) the concentration weighted mean diameter of the slurry and (b) the D50 size of the slurry. Qualitative comparison is made with the wear rate predicted by the simulations and the field data. Simulations and field data show that at low flow rates, the side-wall gouging wear near the tongue region becomes significant.

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“…Neglect of pressure and gravity terms in force balance on the particles also limited the analysis to fine particles which follow the carrier fluid closely. These limitations were addressed in [16] using a quasi-3D model. The main contribution of the study [16] was the prediction of main stream and secondary flows at any arbitrary cross-section of the pump casing.…”

Section: Introductionmentioning

confidence: 99%

CFD Prediction of Erosion Wear in Centrifugal Slurry Pumps for Dilute Slurry Flows

Pagalthivarthi¹,

Gupta²,

Tyagi

et al. 2011

The Journal of Computational Multiphase Flows

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The paper discusses numerical prediction of erosion wear trends in centrifugal pump casing pumping dilute slurries. The casing geometry is considered two-dimensional. Discrete Phase Model (DPM) in FLUENT 6.1 ® is utilized to obtain dilute slurry flow field through the pump casing employing two-way coupling. Standard k Ϫ e model is used for turbulence. Effect of several operational parameters viz. pump flow rate, pump speed (RPM), particle diameter and various geometry conditions viz. tongue curvature, slope of the discharge pipe and casing width is studied. Qualitative trends of erosion wear is described for these operational and geometric parameters with an idea to lower the wear rates and to make the wear pattern along the casing wall as uniform as possible. For example, with increase in pump flow rate, wear rates tends to even out whereas with increased casing width, wear rates are found to decrease.

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Particulate Motion and Concentration Fields in Centrifugal Slurry Pumps

Cited by 20 publications

References 6 publications

Multi-Size Particulate Flow through Rotating Channel — Modeling and Validation Using Three Turbulence Models

Multi-Size Particulate Flow through Rotating Channel — Modeling and Validation Using Three Turbulence Models

Finite Element Prediction of Multi-Size Particulate Flow Through Three-Dimensional Pump Casing

CFD Prediction of Erosion Wear in Centrifugal Slurry Pumps for Dilute Slurry Flows

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