Numerical prediction of fully-suspended slurry flow in horizontal pipes

Messa, Gianandrea Vittorio; Malin, M. R.; Malavasi, Stefano

doi:10.1016/j.powtec.2014.02.005

Cited by 69 publications

(55 citation statements)

References 44 publications

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“…The eddy viscosity, ν t , was evaluated by an extension of the standard high-Reynolds form of the k-ε model of Launder and Spalding (1974) to two-phase flows, which is well documented in Messa et al (2013Messa et al ( , 2014Messa et al ( , 2015.…”

Section: Methodology Governing Equationsmentioning

confidence: 99%

A combined CFD-experimental method for abrasive erosion testing of concrete

Messa

Branco

Filho

et al. 2017

Journal of Hydrology and Hydromechanics

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Serious damage may occur to concrete hydraulic structures, such as water galleries, spillways, and stilling basins, due to the abrasive erosion caused by the presence of solid particles in the flow. This underlines the importance of being capable in providing characterization of the concrete from the point of view of its vulnerability to abrasive erosion, in order to improve the design of the structure and the material selection. Nevertheless, the existing apparatus for concrete abrasive erosion testing are either far from allowing realistic simulation of the actual environment in which this phenomenon occurs, or show a large degree of complexity and cost. An alternative method has been developed with the aid of Computational Fluid Dynamics (CFD). CFD was first employed to verify the effectiveness of a new laboratory equipment. Afterwards, a parameter has been introduced which, by successful comparison against preliminary experiments, proved suitable to quantify the effect of the fluid dynamic conditions on the concrete abrasive erosion, thereby opening the way to CFD-based customization of the apparatus. In the future, the synergy of numerical and physical modelling will allow developing predictive models for concrete erosion, making it possible to reliably simulate real structures.

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Section: Methodology Governing Equationsmentioning

confidence: 99%

A combined CFD-experimental method for abrasive erosion testing of concrete

Messa

Branco

Filho

et al. 2017

Journal of Hydrology and Hydromechanics

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“…7). The analysis is reported in Messa (2013) and Messa et al (2014), and revealed that the model is suitable for application to fully-suspended flows but not to bed flows, when the particles accumulate at the bottom of the pipe. Moreover, the model suffers from the absence of the near-wall lift force in the generalized drag term, since an expression of this force in case of dense slurries suitable for inclusion in a two-fluid model does not seem available at present.…”

Section: Supplementary Materials Appendix A: Validation Of the Model Imentioning

confidence: 99%

“…In Messa et al ( , 2014 we addressed horizontal pipe flows and found that the application of the equilibrium wall function of Launder and Spalding (1972) to model the velocity of the two phases, the turbulent kinetic energy and its dissipation rate in the near-wall cells procures reliable predictions of the viscous and mechanical contributions to friction (Shook and Bartosik, 1994). In order to generalize this result to a flow in which the equilibrium assumption is not satisfied, in this work we replaced the equilibrium wall function with the non-equilibrium one (Launder and Spalding, 1974).…”

Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

“…12). Messa (2013) and Messa et al (2014) performed an extensive comparison with a large dataset of measurements from different authors, and found that the triplet σ α = 0.7, [η] = 2.5, and α pm = 0.70 (within the range of variability usually encountered in literature) produces good agreement with the experiments in case of fully suspended flows except close to the pipe wall for those flows in which the already mentioned near-wall lift plays an important role. The comparison with additional data from Kaushal and Tomita (2007) and Nabil et al (2013), which are very relevant in the context of the present study, is reported in Appendix A.…”

Section: Governing Terms and Validation Of The Modelmentioning

confidence: 99%

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Computational investigation of liquid-solid slurry flow through an expansion in a rectangular duct

Messa

Malavasi

2014

Journal of Hydrology and Hydromechanics

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Abstract:The flow of a mixture of liquid and solid particles at medium and high volume fraction through an expansion in a rectangular duct is considered. In order to improve the modelling of the phenomenon with respect to a previous investigation , use is made of a two-fluid model specifically derived for dense flows that we developed and implemented in the PHOENICS code via user-defined subroutines. Due to the lack of experimental data, the two-fluid model was validated in the horizontal pipe case, reporting good agreement with measurements from different authors for fully-suspended flows. A 3D system is simulated in order to account for the effect of side walls. A wider range of the parameters characterizing the mixture (particle size, particle density, and delivered solid volume fraction) is considered. A parametric analysis is performed to investigate the role played by the key physical mechanisms on the development of the two-phase flow for different compositions of the mixture. The main focuses are the distribution of the particles in the system and the pressure recovery.

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“…Amongst the main issues one can point out numerical instabilities, very timeconsuming, difficulty in dealing with the complex geometries since the calculation time becomes prohibitively expensive and none of the existing models has shown to be able to determine the minimum in the pressure gradient versus slurry velocity, which characterizes the transition to bed flows (Messa, Malin & Malavasi, 2014).…”

Section: Euler-euler Numerical Modelsmentioning

confidence: 99%

Settling Suspensions Flow Modelling: A Review

Silva

Garcı́a

Faia

et al. 2015

KONA

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In spite of the widespread application of settling suspensions, their inherent complexity has yet to be properly predicted by a unified numerical model or empirical correlation, and usually industries still possess customized charts or data for their particular suspension. This is, clearly, rather inefficient and can lead to oversized dimensioning, low energy efficiency and even operation limitations/difficulties. In this manuscript a review of empirical correlations, charts and numerical models that have been employed to predict the behaviour of settling suspensions is briefly described, providing information on the advantages and drawbacks of each method. Their evolution throughout the years: from Durand and Condolios correlations, to empirical models by Wasp, single phase simplifications with mixture properties by Shook and Roco, and to other Euler-Euler or Euler-Lagrangian numerical models, will be presented. Some considerations on recent particle migration and turbulence modification publications will be added. In addition, information about some current CFD application of LatticeBoltzmann and Discrete Element Method (DEM) will be given. Lastly, data from CFD modelling employed by the authors that is able to predict turbulence attenuation in settling flows with medium sized particles for different concentrations is reported.

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Numerical prediction of fully-suspended slurry flow in horizontal pipes

Cited by 69 publications

References 44 publications

A combined CFD-experimental method for abrasive erosion testing of concrete

A combined CFD-experimental method for abrasive erosion testing of concrete

Computational investigation of liquid-solid slurry flow through an expansion in a rectangular duct

Settling Suspensions Flow Modelling: A Review

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