CFD–PBM Numerical Study on Liquid–Liquid Dispersion in the Q-Type Static Mixer

2021 ◽  
Author(s):  
Huibo Meng ◽  
Jianbao Wang ◽  
Yanfang Yu ◽  
Zongyong Wang ◽  
Jianhua Wu
Keyword(s):  
Numerical Study ◽  
Static Mixer ◽  
Liquid Dispersion

scholarly journals Mixing Characteristics Of Gas-Liquid Flow In A Static Mixer: A Numerical Study

2020 ◽  
Vol 12 (2) ◽  
Author(s):  
Ryan Anugrah Putra
Keyword(s):  
Liquid Velocity ◽  
Numerical Study ◽  
Axial Distance ◽  
Sudden Increase ◽  
Static Mixer ◽  
Mixing Condition ◽  
Mixing Characteristics ◽  
Euler Model ◽  
Gas Liquid Flow ◽  
Liquid Flows

Mixing characteristics of gas-liquid co-current upward flow inside a vertical pipe equipped with a helical static mixer element were numerically investigated. The results from computational fluid dynamics (CFD) simulations with Euler-Euler model of three different length to diameter ratio (L/D) of the static mixer elements were compared. All simulated static mixers provide a better mixing condition in the comparison with the one without a static element. The sudden increase of rotational strength indicated by the liquid velocity curl was observed once the gas-liquid flows enter the static-mixer element zone. The smallest L/D static mixer provides the highest liquid velocity curl in the smallest axial distance providing the most effective mixing process among the tested elements. The best mixing characteristics shown by radial gas distribution was achieved with the static mixer with a smallest L/D.

scholarly journals Turbulent liquid–liquid dispersion in SMV static mixer at high dispersed phase concentration

2011 ◽  
Vol 66 (23) ◽  
pp. 5762-5774 ◽  
Author(s):  
Emeline Lobry ◽  
Félicie Theron ◽  
Christophe Gourdon ◽  
Nathalie Le Sauze ◽  
Catherine Xuereb ◽  
...  
Keyword(s):  
Dispersed Phase ◽  
Static Mixer ◽  
Liquid Dispersion ◽  
Phase Concentration

scholarly journals EXPERIMENTAL AND NUMERICAL STUDY ON THE FLOW VISUALIZATION IN A TRI-HELICAL STATIC MIXER

2011 ◽  
Vol 19 (4) ◽  
Author(s):  
Kuo-Tung Chang ◽  
Jer-Huan Jang ◽  
Teng-Chuang Lai ◽  
Jun-Nan Chen
Keyword(s):  
Flow Visualization ◽  
Numerical Study ◽  
Static Mixer

A Numerical Study of Turbulent Flow in Helical Static Mixers

2006 ◽  
Author(s):  
Ramin K. Rahmani ◽  
Anahita Ayasoufi ◽  
Theo G. Keith
Keyword(s):  
Turbulent Flow ◽  
Molecular Diffusion ◽  
Stokes Equations ◽  
Numerical Study ◽  
Critical Role ◽  
Three Dimensional ◽  
Turbulent Dispersion ◽  
Working Fluid ◽  
Static Mixer ◽  
Static Mixers

Many processing applications call for the addition of small quantities of chemicals to working fluid. Hence, fluid mixing plays a critical role in the success or failure of these processes. An optimal combination of turbulent dispersion down to eddies of the Kolmogoroff scale and molecular diffusion would yield fast mixing on a molecular scale which in turn favors the desired reactions. Helical static mixers can be used for those applications. The range of practical flow Reynolds numbers for these mixers in industry is usually from very small (Re ∼ 0) to moderate values (Re ∼ 5000). In this study, a helical static mixer is investigated numerically using Lagrangian methods to characterize mixer performance under turbulent flow regime conditions. A numerical simulation of turbulent flows in helical static mixers is employed. The model solves the three-dimensional, Reynolds-averaged Navier-Stokes equations, closed with the Spalart-Allmaras turbulence model, using a second-order-accurate finite-volume numerical method. Numerical simulations are carried out for a six-element mixer, and the computed results are analyzed to elucidate the complex, three-dimensional features of the flow. Using a variety of predictive tools, mixing results are obtained and the performance of static mixer under turbulent flow condition is studied.

Numerical Study of the Heat Transfer Rate in a Helical Static Mixer

2006 ◽  
Vol 128 (8) ◽  
pp. 769-783 ◽  
Author(s):  
Ramin K. Rahmani ◽  
Theo G. Keith ◽  
Anahita Ayasoufi
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Heat Transfer Rate ◽  
Transfer Rate ◽  
Numerical Study ◽  
Three Dimensional ◽  
Static Mixer ◽  
Flow Conditions ◽  
Modern Approach ◽  
Static Mixers

In chemical processing industries, heating, cooling, and other thermal processing of viscous fluids are an integral part of the unit operations. Static mixers are often used in continuous mixing, heat transfer, and chemical reactions applications. In spite of widespread usage, the flow physics of static mixers is not fully understood. For a given application, besides experimentation, the modern approach to resolve this is to use powerful computational fluid dynamics tools to study static mixer performance. This paper extends a previous study by the authors on an industrial helical static mixer and investigates heat transfer and mixing mechanisms within a helical static mixer. A three-dimensional finite volume simulation is used to study the performance of the mixer under both laminar and turbulent flow conditions. The turbulent flow cases were solved using k−ω model. The effects of different flow conditions on the performance of the mixer are studied. Also, the effects of different thermal boundary conditions on the heat transfer rate in static mixer are studied. Heat transfer rates for a flow in a pipe containing no mixer are compared to that with a helical static mixer.

A Numerical Study of the Global Performance of Two Static Mixers

2006 ◽  
Vol 129 (3) ◽  
pp. 338-349 ◽  
Author(s):  
Ramin K. Rahmani ◽  
Anahita Ayasoufi ◽  
Theo G. Keith
Keyword(s):  
Numerical Study ◽  
Shear Thickening ◽  
Static Mixer ◽  
Mixing Processes ◽  
Viscous Liquids ◽  
Static Mixers ◽  
Continuous Mixing ◽  
Mass Transfer Processes ◽  
Global Performance ◽  
Shear Thickening Fluids

The use of in-line static mixers has been widely advocated for an important variety of applications, such as continuous mixing, heat and mass transfer processes, and chemical reactions. This paper extends previous studies by the authors on industrial static mixers and illustrates how static mixing processes of single-phase viscous liquids can be numerically simulated. Mixing of Newtonian, shear-thinning, and shear-thickening fluids through static mixer, as well as thermal enhancement by static mixer is studied. Using different measuring tools, the global performance and costs of SMX (Sulzer mixer X) and helical static mixers are studied. It is shown that the SMX mixer manifests a higher performance; however, the required energy to maintain the flow across a SMX mixer is significantly higher.

A NUMERICAL STUDY ON MIXING IN THE KENICS STATIC MIXER

1995 ◽  
Vol 136 (1) ◽  
pp. 119-141 ◽  
Author(s):  
F. H. LING ◽  
X. ZHANG
Keyword(s):  
Numerical Study ◽  
Static Mixer
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