Research on multi-objective optimization of bioreactor cupped impeller CFD based on improved proxy model

Thermal Science and Engineering Progress, Год журнала: 2025, Номер unknown, С. 103508 - 103508

Опубликована: Март 1, 2025

Язык: Английский

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A novel liquid–gas–solid computational fluid dynamics-discrete element method-volume of fluid coupling method with compressible fluid phases

Physics of Fluids, Год журнала: 2025, Номер 37(4)

Опубликована: Апрель 1, 2025

Traditional computational fluid dynamics (CFD)-discrete element method (DEM)-volume of (VOF) three-phase coupling methods may produce inaccurate results in certain scenarios due to the assumption incompressible liquid and gas phases. In this study, a novel CFD-DEM-VOF is proposed, which integrates unified equation state account for compressibility both The α transport derived, fractional step proposed solving equation. Additionally, continuity incorporating coefficients derived used influence during pressure correction. algorithm validated through simulations three classic cases: single particle entering water from air, dam break, entry block. Moreover, unsaturated soil loading problems are investigated using method. indicate that liquid–gas interface begins rise only when deep soil, saturated with liquid, experiences significant disturbance. A comparison excess pore movement velocities particles two monitoring mesh layers below initial level reflects spatial response patterns under external loading. Finally, coefficient discussed.

Язык: Английский

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Hydrodynamics of heterogeneous particle swarm in gas-liquid-solid stirred tanks with free surface studied by DEM-VOF

Powder Technology, Год журнала: 2025, Номер unknown, С. 121103 - 121103

Опубликована: Май 1, 2025

Язык: Английский

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Large-scale dispersed phase-resolved direct numerical simulation (LDPR-DNS) of mechanically stirred reactors: Understanding the dispersion mechanism of multiphase flow and qualifying the droplets produced

Powder Technology, Год журнала: 2024, Номер 439, С. 119707 - 119707

Опубликована: Март 28, 2024

Язык: Английский

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Numerical study of the interaction between cylindrical particles and shear-thinning fluids in a linear shear flow

Physics of Fluids, Год журнала: 2024, Номер 36(8)

Опубликована: Авг. 1, 2024

In this paper, the interaction between cylindrical particles and shear-thinning non-Newtonian fluids in a linear shear flow is investigated using particle-resolved direct numerical simulation. The Carreau model used to represent rheological properties of fluids, method validated against previously published data. Then, effects Reynolds number (Re), aspect ratio (Ar), power-law index (n), (Cu), incident angle (α) on drag coefficient (CD), lift (CL), torque (CT) are investigated. results show that field structure pressure distribution around particle different from those uniform flow, generate extra CL CT. Furthermore, comparing with Newtonian fluid change viscosity significantly decrease CD, CL, CT particles. variation laws influencing mechanisms under working conditions discussed by dividing total coefficients into viscous contributions. Predictive correlations established considering Re, Ar, n, Cu, α. findings indicate both mode must be considered when evaluating relevant particle–fluid interactions, which provides important guidance for predicting controlling orientation fluids. Meanwhile, predictive can large-scale simulations multiphase coupling.

Язык: Английский

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Discrete Element Method–Volume of Fluid Simulation of Drawdown and Dispersion for Floating Particles in Stirred Tanks: Influences of Impeller Parameters

Industrial & Engineering Chemistry Research, Год журнала: 2024, Номер 63(23), С. 10353 - 10372

Опубликована: Май 30, 2024

Exploring the drawdown and dispersion behaviors of particles in stirred tanks can provide insights valuable references for optimizing design equipment improving efficiency stirring process. In this article, kinetic floating tank were simulated by DEM-VOF (discrete element method–volume fluid) model. The influences impeller parameters (blade number n, rotation speed w, eccentric distance l, off-bottom clearance h) on granular characteristics (particle distribution, coupling force, total translational/rotational energies), fluid dynamics (fluid velocity turbulent energy), gas–liquid free surface investigated. results show that process be divided into pull-down stage, cycle stage. With increase or h, duration stage decreases, while increases. Due to vortex effect motion tank, both particle flow change with parameters. Besides, large n small moderate h result deeper surface.

Язык: Английский

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A comprehensive numerical investigation of the spray characteristics in spill-return atomizers using coupled VOF and Euler-Lagrange approach

Particuology, Год журнала: 2024, Номер unknown

Опубликована: Окт. 1, 2024

Язык: Английский

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Research on Multi-Objective Optimization of Bioreactor Cupped Impeller Cfd Based on Improved Proxy Model

Опубликована: Янв. 1, 2024

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Язык: Английский

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Thermal-hydraulics performance evaluation of bubble swarms sweeping tube bundles in a direct contact gas-liquid-solid reactor

Applied Thermal Engineering, Год журнала: 2024, Номер 250, С. 123478 - 123478

Опубликована: Май 24, 2024

Язык: Английский

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Study the effect of a new design of a twisted impeller blade on the vortexes formation and power consumption using a centric and eccentric stirred tank experimentally and numerically

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Июль 22, 2024

Vortex formation in stirred tanks is one of the problems facing many tank designers. The current study depicts experimentally and numerically effect changing impeller structure its location a twisted shape on vortex, energy consumption, flow patterns, turbulent kinetic energy. Numerically, finite volume method was used, mathematical model used Volume Fluid to simulate free surface between air water, (k- ε ) flow. Rotational speeds different values ​​between (150-450 RPM) were applied, noting parameters other parameters. showed that rate deviation ​​of torque consumption numerical practical studies relatively acceptable addition convergence vortex. results obtained affect rotation speed affects growth depth also amount for un-baffled less than eccentric tank, depending speed. For example, at (350RPM) it (0.034 N.m) same speed, (0.093 location. comparison patterns central locations impeller.

Язык: Английский

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