Application of an Eulerian granular numerical model to an industrial scale pneumatic conveying pipeline

Heng, JinLiang; New, T. H.; Wilson, P.A.

doi:10.1016/j.apt.2018.10.028

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…Pan et al 16 employed a two-dimensional Eulerian−Eulerian threephase (wastewater, biogas, and sludge) fluid model to investigate the internal flow field of expanded granular sludge bed reactors. Heng et al 17 modeled a cement conveying system at industrial scale with an Eulerian−Eulerian model that well predicts the flow characteristics of the conveyed material. Cubero et al 18 adopted the Eulerian−Eulerian model to simulate a pilot-scale coal gasification fluidized bed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Thermal Drying Process of Sludges Based on CFD-DEM

Gong

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Sludge drying is a crucial part of the sludge treatment and disposal processes, while thermal drying has been a popular choice. In this work, the sludge thermal drying process is numerically simulated using a coupled computational fluid dynamics−discrete element method (CFD-DEM) approach. The CFD-DEM model describes the flow and heat transfer in the gas−solid system, while a mass transfer approach is embedded to describe the variation in the moisture content. First, a suitable numerical model to describe the sludge water removal process is developed based on physical experimental data. Quantitative comparisons with experimental data validate the predictive capability of the numerical model for the continuum gas flow field, as well as the sludge drying process. Then, five key parameters including velocity, temperature and humidity of the heat source, particle size, and sludge pile thickness are discussed to obtain the basic laws affecting the sludge drying process. The pilot dryer is subsequently simulated, and a simplified solution for industrial-scale simulation is proposed. All of the above work is supported by abundant experimental data to demonstrate the capability of the CFD-DEM model. Finally, based on more CFD-DEM simulation, the optimal operating conditions are determined with flexibility recommendations for dryer design summarized. This work contributes to an indepth understanding of sludge drying characteristics and also has important practical and theoretical engineering value.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Thermal Drying Process of Sludges Based on CFD-DEM

Gong

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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“…Luckily, the discrete flow characteristics of particles can be studied by the combined discrete element method (DEM) and computational fluid dynamics (CFD) model (CFD-DEM) [20,21]. CFD-DEM model can obtain particle scale information which is useful for fundamental understanding while TFM can model industrial scale system [22,23] where billions of particles are encountered. Some cases studied by the TFM are hard to be modelled by the CFD-DEM model due to limited computational resource.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Gas‐Solid Flow in a Horizontal Stepped Pipeline

Chu

Pan

et al. 2019

Mathematical Problems in Engineering

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In this paper, the mechanism governing the particle-fluid flow characters in the stepped pipeline is studied by the combined discrete element method (DEM) and computational fluid dynamics (CFD) model (CFD-DEM) and the two fluid model (TFM). The mechanisms governing the gas-solid flow in the horizontal stepped pipeline are investigated in terms of solid and gas velocity distributions, pressure drop, process performance, the gas-solid interaction forces, solid-solid interaction forces, and the solid-wall interaction forces. The two models successfully capture the key flow features in the stepped pipeline, such as the decrease of gas velocity, solid velocity, and pressure drop, during and after the passage of gas-solid flow through the stepped section. What is more important, the reason of the appearance of large size solid dune and pressure surge phenomena suffered in the stepped pipeline is investigated macroscopically and microscopically. The section in which the blockage problem most likely occurs in the stepped pipeline is confirmed. The pipe wall wearing problem, which is one of the most common and critical problems in pneumatic conveying system, is analysed and investigated in terms of interaction forces. It is shown that the most serious pipe wall wearing problem happened in the section which is just behind the stepped part.

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