Effect of an Inclined Slots on the Power Consumption and Vortices Size in a Rushton Turbine Agitated Tank DOI Creative Commons
Sarra Youcefi, Mohamed Bouzit,

Abdelkader Youcefi

et al.

Chinese Journal of Mechanical Engineering, Journal Year: 2023, Volume and Issue: 36(1)

Published: Dec. 6, 2023

Abstract Mechanical agitation in baffled vessels with turbines plays a vital role achieving homogeneous fluid mixing and promoting various transfer operations. Therefore, designing optimal energy efficiency flow dynamics is essential to enhance operational performance eliminate perturbations. Hence, the present research focuses on numerical investigation of impact inclined slots different angles installed at sidewall cylindrical vessel equipped Rushton turbine. This study explores power consumption vortex size while considering rotation directions impeller speeds. The simulations are conducted for Reynolds numbers ranging from 10 4 5 , using RANS k - ε turbulence model govern inside stirred vessel, accounting mass momentum balances. results have shown that installation reduces compared conventional configurations. Moreover, increasing slot angle 0 32.5° further size, especially negative On other hand, leads decrease an increase size. therefore proposes design constructing Rushton-turbine offering operation, characterized by reduced minimized

Language: Английский

Experimental investigation of synthetic jet impingement upon a honeycomb DOI
Kangfu Sun, Siying Zhang,

Ni Shi

et al.

European Journal of Mechanics - B/Fluids, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

Citations

0
Simulation of Multi-Phase Flow in Autoclaves Using a Coupled CFD-DPM Approach DOI Open Access

Bin Kou,

Yanqing Hou,

Weiqin Fu

et al.

Processes, Journal Year: 2023, Volume and Issue: 11(3), P. 890 - 890

Published: March 15, 2023

In this work, a numerical simulation study on the mixing characteristics of multiphase flow in an autoclave was carried out using CFD technology. The Eulerian–Eulerian model and discrete phase (DPM) were employed to investigate solid holdup, critical suspension speed, nonuniformity suspension, gas holdup distribution, bubble tracks, residence time during stirring leaching autoclave. Experiments validate accuracy model, experimental values correspond well with results. results show that solid–liquid is mainly affected by axial flow, best agitation speed 400 rpm, increasing further cannot make mixture more homogenous buildup occurred above calculated 406 which slightly lower than obtained from empirical formula. concentrated vortex area blade. When completely dispersed state (N = 300 rpm), average bubbles 5.66 s.

Language: Английский

Citations

9
Characterization of a synthetic jet vortex ring flowing through honeycomb DOI Open Access
Kangfu Sun, Jiao Sun, Ying Fan

et al.

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(7)

Published: July 1, 2023

The investigation of synthetic jet vortex rings flowing through a honeycomb is measured by two-dimensional particle-image velocimetry. established using free jets generated piston–cylinder apparatus upstream the honeycomb. On that basis, turbulence obtained at circulation Reynolds numbers ReΓ = 3437, 5155, 6874, and 8592, Resj 561, 841, 1121, 1402. effects diameter number (ReM 41–449) length-to-cell ratio (Φ 4.2–12.5) on characterization flow are discussed in detail. A combinatorial similarity parameter can characterize effect passive control fields proposed validated. parameter, ReM/Φ, determined dimensional analysis according to change momentum flux loss; its predictive capability verified quantitatively based loss kinetic energy vortex-ring circulation. evolutions phase-averaged vorticity finite-time Lyapunov exponents nearly consistent close parameters. Furthermore, as indicated results, ReM/Φ responds combined relative magnitude inertial viscous forces, shape resistance geometry flow-field–honeycomb interactions. Understanding ring important for accuracy prediction models selection size.

Language: Английский

Citations

5
Flow stirred by open turbine: A modal analysis of multiscale flow characteristics DOI
Jie Jin,

Shaoyang Bu,

Ying Fan

et al.

Asia-Pacific Journal of Chemical Engineering, Journal Year: 2024, Volume and Issue: 19(3)

Published: March 4, 2024

Abstract The turbulence observed in the stirred tank is a result of superposition flows at different scales, each exerting various influences on operational processes. To understand flow characteristics associated with stirring, this paper undertakes particle image velocimetry (PIV) experimental research an unbaffled by open turbine featuring four distinct blade deflection angles. field manifests as double‐circulation pattern; however, it worth noting that angle exerts significant impact stirring process. Specifically, when reached 90°, discharge aligned closely radial direction, accompanied pronounced fluctuations high‐velocity region. Lagrangian coherent structures (LCS) formed were subsequently extracted and subjected to finite‐time Lyapunov exponent (FTLE) analysis. Notably, more regular wake pattern emerged proximity tip, while larger scale structure persisted along direction. systematically analyze turbine, modal analysis was employed. By reconstructing based principle 50% energy content, decomposition scales achieved. turbulent kinetic (TKE) generated calculated, revealing high TKE values primarily originate from large‐scale structure. Conversely, small‐scale exhibits uniform distribution across regions. regions characterized higher velocities, peak also manifests; significantly smaller magnitude compared original or flow.

Language: Английский

Citations

1
Tilted PIV: A novel approach for estimating the turbulent kinetic energy in stirred tanks DOI
Aline Gallo De Mitri, Rodrigo de Lima Amaral,

Helder L. de Moura

et al.

Measurement, Journal Year: 2023, Volume and Issue: 217, P. 113112 - 113112

Published: June 1, 2023

Language: Английский

Citations

2
Proper orthogonal decomposition modal analysis in a baffled stirred tank: a base tool for the study of structures DOI Creative Commons
Arturo A. Arosemena, Jannike Solsvik

Flow, Journal Year: 2023, Volume and Issue: 3

Published: Jan. 1, 2023

Proper orthogonal decomposition (POD) is applied to three-dimensional (3-D) velocity fields collected from large-eddy simulations (LES) of a baffled stirred tank. In the LES, tank operates with Rushton-type impeller under turbulent conditions (at least in near-impeller region) and working fluid exhibits either Newtonian or shear-thinning rheology. The most energetic POD modes are analysed, reconstruction based on higher proposed approximate fluctuating component field. Subsequently, used identify vortical structures characterise them terms their shape. identified by considering frame-invariant formulation popular, Eulerian, local-region-type method: $Q$ -criterion. Statistics shape-related parameters then investigated address morphology structures. It found that: (i) regardless rheology, it seems feasible decompose 3-D field into its mean, periodic components using POD, allowing, for instance, reduced-order modelling motions mixing enhancement purposes, (ii) related turbulence mostly tubular. Finding implies that, as starting point, phenomenological models interaction between particles (drops bubbles) vortices should consider latter cylindrical rather than spherical shape, classically assumed these models.

Language: Английский

Citations

1
Effect of an Inclined Slots on the Power Consumption and Vortices Size in a Rushton Turbine Agitated Tank DOI Creative Commons
Sarra Youcefi, Mohamed Bouzit,

Abdelkader Youcefi

et al.

Chinese Journal of Mechanical Engineering, Journal Year: 2023, Volume and Issue: 36(1)

Published: Dec. 6, 2023

Abstract Mechanical agitation in baffled vessels with turbines plays a vital role achieving homogeneous fluid mixing and promoting various transfer operations. Therefore, designing optimal energy efficiency flow dynamics is essential to enhance operational performance eliminate perturbations. Hence, the present research focuses on numerical investigation of impact inclined slots different angles installed at sidewall cylindrical vessel equipped Rushton turbine. This study explores power consumption vortex size while considering rotation directions impeller speeds. The simulations are conducted for Reynolds numbers ranging from 10 4 5 , using RANS k - ε turbulence model govern inside stirred vessel, accounting mass momentum balances. results have shown that installation reduces compared conventional configurations. Moreover, increasing slot angle 0 32.5° further size, especially negative On other hand, leads decrease an increase size. therefore proposes design constructing Rushton-turbine offering operation, characterized by reduced minimized

Language: Английский

Citations

1