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Showing 1 to 20 of 36 for “"Eulerian-Eulerian"”.
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Eulerian-Eulerian Modeling of Fluidized Beds
Fluidized bed reactor technology has been widely adopted within the industry as vital component for numerous manufacturing, power generation and gasification processes due to its enhanced mixing characteristics. Computational modeling of fluidized bed hydrodynamics is a significant challenge that …
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Assessment of Multi-Phase-CFD Frameworks for High Void Fraction Flow in Large Diameter Systems
… approaches adding slip correlations or the Eulerian framework. Beyond simply bubbly flows, these hybrid formulations and multiphase frameworks remain widely untested, particularly for large nuclear reactor components. In this work, the Volume of Fluid framework (VOF), a hybrid …
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Hydrodynamic and gasification behavior of coal and biomass fluidized beds and their mixtures
… of Geldart A particles using CFD. An extensive Eulerian-Eulerian numerical study was executed and simulations were compared and validated with experiments conducted at Utah State University. In order to improve numerical predictions using an Eulerian-Eulerian model, drag models were assessed to …
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Near-wall modeling of bubbly flows
… methods to the bubbly flow regime is to use an Eulerian-Eulerian two-fluid model, which solves for averaged mass and momentum equations for liquid and gas phases, as well as the k-epsilon turbulence model with modifications to account for the presence of bubbles. The resulting partial …
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Computational Modeling and Simulations of Hydrodynamics for Air-Water External Loop Airlift Reactors
… National Laboratory, CFDLib, which employs an Eulerian-Eulerian ensemble averaged method. A two-dimensional Cartesian coordinate system was used to conduct an extensive grid resolution study; it was found that grid cells smaller than the bubble diameter produced unstable solutions. Next, …
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Numerical Investigations of Bubble Column Equipped with Vertical Internals in Different Arrangements
… column hydrodynamics. In the present work, an Eulerian-Eulerian based two-fluid model (TFM) coupled with a population balance model (PBM) is used to simulate the gas-liquid two-phase flows in bubble columns. The models studied were validated using experimental data from the literature. The …
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Unstructured grid simulations of shocks and detonations in two-phase flows
… to this solver to allow simulations of both Eulerian-Eulerian treatment and Eulerian-Lagrangian treatment. Both methods were used to study one-dimensional shock wave attenuation in two-phase flow containing gas and particles. The results show good agreement with experiment for both methods. …
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Gas-liquid simulation of an airlift bubble column reactor
… to investigate the hydrodynamics parameter. An Eulerian-Eulerian approach was used to model air as the dispersed phase within a continuous phase of water using the commercial software ANSYS FLUENT 15.0. The turbulence in the gas-liquid simulation is described by using the K-Epsilon model, RNG …
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Validation of a multiphase CFD model with mass transfer for xenon removal in molten salt reactor
… Following this discussion, the details about the Eulerian-Eulerian two-fluid model and constitutive relations are presented. The detailed procedures and results of the three validation experiments are reported. Different phase interaction mechanisms, material properties, and constitutive relations …
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Numerical Analysis of Multiphase Flow in Bubble Columns and Applications for Microbial Fuel Cells
… the accuracy of numerical predictions. An Eulerian-Eulerian multi-fluid model was used to simulate fluidization and to capture the complex physics associated therewith. The commercial code ANSYS Fluent was used to study two-dimensional gas-liquid bubble columns. A comprehensive parameter …
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Numerical Modeling of Air-Water Flows in Bubble Columns and Airlift Reactors
… characteristics for each configuration. An Eulerian-Eulerian approach was used to model air as the dispersed phase within a continuous phase of water using the commercial software FLUENT. The Schiller-Naumann drag model was employed along with virtual mass and the standard k-e turbulence …
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CFD Analysis for Beyond Bubbly Gas-Liquid Two-Phase Flows in a Large Diameter Pipe
… prediction of two-phase flow parameters on the Eulerian-Eulerian framework, are validated and an appropriate choice of closure models for the flow regimes beyond bubbly flows is proposed. Third, CFD models affecting the turbulence mixing effect are compared and the effect of bubble-induced …
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Modeling of multiphase turbulent flow in continuous casting of steel
… above. A new hybrid multiphase flow model Eulerian-Eulerian Discrete-Phase Model (EEDPM), which can estimate flow pattern and bubble interactions such as coalescence, breakup, shearing off and volumetric expansion is proposed. Also, a simple 1D pressure energy model is developed to estimate …
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A Computational Study of the Hydrodynamics of Gas-Solid Fluidized Beds
… gas-solid hydrodynamics of fluidized beds. An Eulerian-Eulerian multi-fluid model and granular kinetic theory were used to simulate fluidization and to capture the complex physics associated therewith. The commercial code ANSYS FLUENT was used to study two-dimensional single solids phase glass …
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Modeling and Control of Batch Pulsed Top-spray Fluidized bed Granulation
… and simulation tests. In addition, an Eulerian-Eulerian two-fluid model (EETFM) was developed to describe the gas-particle two-phase flow in the fluidized bed granulator. By computational fluid dynamic analysis, it has been proven that the fluidized bed granulation system is not …
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Assessment strategies for mixing in very viscous gas-liquid two-phase flows
… Using a commercial software ANSYS FLUENT with an Eulerian-Eulerian approach to model the bubble and the continuous phase and.;ii) Using an in house LES based Navier-Stokes solver with the Eulerian-Lagrangian method which uses the Particle-in-Ball approach for the Lagrangian particle tracking of …
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The effects of low aspect ratio and heat exchanging internals on the bubble properties and flow regime in a pilot-plant bubble/slurry bubble column for Fischer-Tropsch synthesis
… flow regime. The validated CFD codes, using Eulerian-Eulerian approach incorporated with the population balance model PBM, exhibit the capability to simulate the bubble column in bubbly and turbulent flow regimes. However, results revealed that the presence of internals enhanced the gas …
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Predicting hydrates plugging risk in subsea gas pipeline: CFD, analytical and linear regression modelling.
… pipe section. The core of the model employs Eulerian-Eulerian multiphase modeling within ANSYS Fluent software. This approach successfully predicted hydrate deposition rates within a ±10% uncertainty range across various subcooling temperatures and gas velocities. At lower gas velocities (4.7 …
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Computational Modelling and Optimization of Dry Powder Inhalers
… to the DPI design objectives (A) and (B). An Eulerian-Eulerian (EE) computational fluid dynamics (CFD) approach has then been used to optimize a DPI entrainment geometry. Three different optimized entrainment geometries have been found corresponding to three different therapeutic applications. …
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An integrated furnace co-simulation methodology based on a reduced order CFD approach
… the important particulate effects while using a Eulerian-Eulerian (EE) approach; using the reduced order CFD model to generate a database of results that covers a wide range of operating conditions; to develop a data-driven surrogate model using machine learning techniques; to integrate the …
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