Evaluation of Hydrodynamic Closures for Bubbly Regime CFD Simulations in Developing Pipe Flow

Shiea, Mohsen; Buffo, Antonio; Baglietto, Emilio; Lucas, Dirk; Vanni, Marco; Marchisio, Daniele

doi:10.1002/ceat.201900116

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…The third approach is the Eulerian approach, where all phases are described in the Eulerian frame of reference. All phases are described as interpenetrating continua [6,7,8], and method is suitable for a broad spectrum of various flow regimes.…”

Section: Introductionmentioning

confidence: 99%

Eulerian Multi-Fluid Model for Polydisperse Flows

Keser¹,

Ceschin²,

Battistoni³

et al. 2021

14th WCCM-ECCOMAS Congress

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This work restricts the term multiphase only to disperse flows, where one of the phases is present in the form of particles, droplets or bubbles, which are suspended within the continuous phase. The dispersed elements can vary in size. The proposed method uses the classes method in the Euler-Euler framework to handle the flow's polydisperse nature. With this approach, every droplet/bubble/particle class is treated like a different phase in the calculation, i.e. every size class has its continuity and momentum equation. However, the pressure is shared among all phases. The derived model is tested for various polydisperse flows, which display the developed model's capability to predict such complex dynamic behaviour. These test cases include complex bubbly flows and dense spray (where droplet sizes vary significantly).

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Section: Introductionmentioning

confidence: 99%

Eulerian Multi-Fluid Model for Polydisperse Flows

Keser¹,

Ceschin²,

Battistoni³

et al. 2021

14th WCCM-ECCOMAS Congress

View full text Add to dashboard Cite

show abstract

“…that is, when the dispersed phase fraction is low 7,8 . The Eulerian approach describes all phases in the Eulerian frame of reference, and all phases are treated as interpenetrating continua 9‐11 . This approach is suitable for a wide range of different flow regimes.…”

Section: Introductionmentioning

confidence: 99%

Implicitly coupled phase fraction equations for polydisperse flows

Keser

Ceschin

Battistoni

et al. 2020

Numerical Methods in Fluids

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This work presents the implementation, verification and the validation of an incompressible Eulerian multifluid model for polydisperse flows. The proposed model uses a novel monolithic, that is, implicitly coupled phase continuity equation for an arbitrary number of fluids, where the breakup source and sink terms are handled implicitly in the block‐system. The implemented model is tested for an upward bubbly flow inside a large vertical pipe. The selected flow conditions exhibit both breakup and coalescence. The grid refinement study is conducted on four structured grids with varying levels of refinement. In the validation section, the numerical results are compared to the TOPFLOW experimental measurements. The last presented test examines the performance of the novel implicitly coupled phase continuity equation to the corresponding segregated formulation and the standard segregated formulation. The performance is evaluated by comparing the conservation error over the nonlinear iterations. The presented model exhibits good agreement with the experimental measurements and gives stable results on various grids with different levels of refinement. Moreover, the implicit coupling reduces the conservation error during the calculation.

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