CFD‐Simulation einer generischen Reaktion in einem gerührten Behälter

Kleiner, Thomas; Gottanka, Michael; Stary, Alexander; Rehfeldt, Sebastian; Bertakis, Evangelos; Klein, Harald

doi:10.1002/cite.201900188

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…In addition, since the release and establishment of said document, significant progress has been achieved, especially in terms of measurement technology. (Laser-)Optical methods such as particle image velocimetry (PIV) [3,4], laser induced fluorescence (LIF) [5][6][7] and the shadowgraphy method [8,9] have become the standard for fluid flow investigation, alongside numerical simulations via computational fluid dynamics (CFD) [10][11][12][13][14][15]. Internationally, the encyclopedic Handbook of Industrial Mixing has been published, documenting the progress in understanding mixing processes in recent decades and providing at least some basic construction guidelines for multistage impellers [16,17].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Investigation and Visualization of Flow Fields in Stirred Tank Reactors Using a Fluorescence Tracer Method

Matzke

Behrens

Steins

et al. 2022

Chemie Ingenieur Technik

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In this study, flow fields in stirred tank reactors are investigated by a fluorescence tracer method. For these measurements, a fluorescent dye is inserted into a stirred tank reactor and distributed by the impeller flow, following the characteristic main circulation pathways. By this means, the main flow fields can be detected and visualized. Originally developed and used for the investigation of viscoelastic fluids, the method was adapted for Newtonian fluids with low viscosity in this study, with impeller installation height and impeller Reynolds numbers selected as influencing parameters. The resulting flow fields in both single-and double-impeller setups match the known structures from literature excellently. Therefore, the developed fluorescence tracer method has proven to be a promising supplement to the established repertoire of fluid investigation methods, with little effort in both experiment itself as well as the following data analysis steps.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Investigation and Visualization of Flow Fields in Stirred Tank Reactors Using a Fluorescence Tracer Method

Matzke

Behrens

Steins

et al. 2022

Chemie Ingenieur Technik

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“…Chang et al 6 performed the lattice Boltzmann simulation combined with unknown-index algorithm for the convective heat transfer problems of an impeller stirred tank, and focused on three types of motion of the heating impeller are adopted in this study, including rotation with constant angular velocity, oscillation and oscillating rotation. Kleiner et al 7 used computational fluid dynamics to simulate a generic reaction in a stirred tank and studied the temperature control of the reactor, and found that the simulation approach is very well suited for a reaction-specific of the stirred tank. Li et al 8 carried out a simulation of an unbaffled stirred tank reactor driven by a magnetic stirring rod by Euler-Euler model coupled with the volume of fluid (VOF) method, and results showed that LES model and RNG k-epsilon model can predict the better tangential velocity and axial velocity.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis and optimization of key parts in the stirred tank based on solid-liquid flow field

Jiang

Yuan

et al. 2022

Science Progress

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In order to further improve the mixing performance of the mixing device, the structure of the agitator was optimized, and the effects of the diameter and pitch of the agitator on the solid-liquid suspension characteristics were analyzed by single factor method. Multiple reference frame (MRF), computational fluid dynamics, Euler multiphase flow model and standard K- ε turbulence model were used to investigate the effect of the height from the bottom of the agitator on the suspension characteristics of particles in the agitator was studied. The results show that reducing the height from the bottom of the agitator can promote the suspension of particles at the bottom of the tank, but too low height from the bottom will easily produce mixing dead zone at the bottom of the tank, and cause the accumulation of particles. Reducing the height of the agitator from the bottom will enlarge the clear liquid area of the flow field, cause uneven particle distribution and increase the stirring torque. With the increase of agitator diameter, the critical suspension speed of the flow field decrease, but the stirring power required by the flow field increase. Increasing the blade spacing in a certain range can promote the suspension of particles and make the distribution of particles in the flow field more uniform. Therefore, the mixing power and the uniformity of particle concentration distribution need to be considered together in order to make the mixing device more efficient and energy-saving.

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Numerical Simulation of Flow Field Optimizing the Rotating Segregation Purification of Silicon for SoG-Si

Shang

Qian

Wang

et al. 2022

Metall Mater Trans B

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In order to improve the preparation efficiency of high-purity silicon, a new method of rotary segregation purification has been developed to prepare polysilicon. Numerical simulation based on ANSYS19.0 software and water model experiments were used to study the distribution of flow field and optimize the impurity removal process. A numerical simulation model suitable for rotating interface is established. The simulation result is in good agreement with the water model experiment. A vortex flow is found in the middle of the mold when the mold insertion depth is 90 mm. The vortex is conducive to the thinning of the impurity enrichment layer at the solid-liquid interface. With the mold insertion depth increases from 90 to 170 mm, two vortex flows appear in the middle and bottom of the mold, respectively. Moreover, setting the mold rotation rate at 100 rpm can contribute to a more stable flow field and a higher melt flow velocity. When the diffusion layer thickness is less than 0.1 mm, the impurity segregation coefficient can approach close to its equilibrium segregation coefficient, indicating that impurity segregation be effectively enhanced by increasing the rotation rate of mold, strengthening the effect of solidification rate and increasing the rotational speed. Industrial tests were carried out at the 100 kg level. The result shows that the rotary segregation method and equipment can achieve the removal of very low impurity in silicon (99.999 pct), and SoG-Si (99.9999 pct) was obtained. This method provides a new way for silicon purification, and it is believed that better results can be obtained through continuous improvement.

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CFD‐Simulation einer generischen Reaktion in einem gerührten Behälter

Cited by 3 publications

References 12 publications

Investigation and Visualization of Flow Fields in Stirred Tank Reactors Using a Fluorescence Tracer Method

Investigation and Visualization of Flow Fields in Stirred Tank Reactors Using a Fluorescence Tracer Method

Numerical analysis and optimization of key parts in the stirred tank based on solid-liquid flow field

Numerical Simulation of Flow Field Optimizing the Rotating Segregation Purification of Silicon for SoG-Si

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