Untersuchungen von Filmströmungen mittels eines neuartigen Micro Particle Image Velocimetry Messverfahrens

Paschke, Steve; Repke, Jens‐Uwe; Wozny, Günter

doi:10.1002/cite.200800056

Cited by 10 publications

(17 citation statements)

References 17 publications

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“…The CFD simulations were compared with PIV measurements, using a lPIV [36]. Simulations and experiments showed the same structure of the macroscopic flow.…”

Section: Flow Fieldmentioning

confidence: 98%

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Maaß¹,

Eppinger²,

Altwasser³

et al. 2011

Chem Eng & Technol

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Previous studies have shown the great potential, but also the great challenges, in handling slim reactors often used for polymerization reactions. Experiments and simulations were carried out in reactors with aspect-to-diameter ratios of up to 5, to test and to evaluate the mixing and dispersion efficiency for liquid-liquid systems of single-and multiple-stage impellers. Therefore, power consumption, mixing time and minimum dispersion speed were determined for five different stirrer types under turbulent conditions. It was found that the dimensionless mixing time is highly sensitive to the configuration of the impellers, with almost no dependency on the turbulent power number. Another focus was the analysis of the effect of the baffles. The influence of the baffle length in slim reactors on the mixing time and the macroscopic flow field was determined.

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“…The CFD simulations were compared with PIV measurements, using a lPIV [36]. Simulations and experiments showed the same structure of the macroscopic flow.…”

Section: Flow Fieldmentioning

confidence: 98%

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Maaß¹,

Eppinger²,

Altwasser³

et al. 2011

Chem Eng & Technol

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“…The relatively macroscopic experiment concentrates the research on the whole plate, where the global parameters such as the wetted area of the plate, liquid thickness, and liquid surface velocity along the flow direction are measured and analyzed; 30 the relatively microscopic experiment focuses the research on a small region on the plate, where the local parameters such as the velocity profile along the liquid thickness are scanned and investigated layer-by-layer. 31 Figure 4 shows the experimental setups for the case without the countercurrent gas flow. Figure 4a displays the microscopic experimental setup and Figure 4b shows the macroscopic experimental setup.…”

Section: Methodsmentioning

confidence: 99%

Detailed Investigations of the Countercurrent Multiphase (Gas–Liquid and Gas–Liquid–Liquid) Flow Behavior by Three-Dimensional Computational Fluid Dynamics Simulations

Zhao

Paschke

et al. 2014

Ind. Eng. Chem. Res.

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This paper focuses on the detailed investigations of the (multi-) liquid flow behaviors on an inclined stainless steel plate in simulations and experiments. Simulations are carried out with FLUENT 6.3; a three-dimensional computational fluid dynamics model considering the gravity, surface tension, and local drag force is developed and presented. Experimental data is obtained with optical methods. One main aspect of the paper’s presentation is the validation of the developed model for the case of one-liquid phase with a countercurrent gas phase, where the parameters (e.g., the thickness and the velocity profile of the liquid phase) are compared with the simulation results and the experimental data. The other key part of the presentation is the numerical investigations with the developed model for the case of two immiscible liquid phases with a countercurrent gas phase. Results show that with the current gas flow rate, the complex flow behavior strongly depends on the (multi-) liquid flow rates and the feed sequence. Furthermore, there is a high stability between the two liquids. All of these data lead to a better understanding of the complex fluid dynamics in three-phase distillation processes.

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“…Experimental investigations using optical measurements showed that the Nußelt theory is valid for inclined smooth plates at low Reynolds numbers 13, 15.

true δ_{normalL} = \sqrt[3]{\frac{3 {\overset{\cdot}{V}}_{normalL} ν_{normalL}}{Bg \sin α}}

…”

Section: Concept Of the Flexible Wetted‐wall Columnmentioning

confidence: 99%

Concept of a Flexible Wetted‐Wall Column for the Distillation of Specialty Chemicals

2021

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The trend of increasing product diversity and decreasing production amounts led to the requirement of higher flexibility of production processes of specialty chemicals. Conventional distillation columns, mostly equipped with structured packings, lack the flexibility to handle product changeovers and throughput. Thus, a newly designed distillation column for specialty chemicals is presented. A numerical model was implemented to analyze the potential of the wetted‐wall column. The simulation of the distillation of a binary methanol/water mixture demonstrated that the wetted‐wall column can generate the desired concentration and temperature profiles. Furthermore, analyses of the pressure drop and separation efficiency with the test system chlorobenzene/ethylbenzene were conducted.

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Untersuchungen von Filmströmungen mittels eines neuartigen Micro Particle Image Velocimetry Messverfahrens

Cited by 10 publications

References 17 publications

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Flow Field Analysis of Stirred Liquid‐Liquid Systems in Slim Reactors

Detailed Investigations of the Countercurrent Multiphase (Gas–Liquid and Gas–Liquid–Liquid) Flow Behavior by Three-Dimensional Computational Fluid Dynamics Simulations

Concept of a Flexible Wetted‐Wall Column for the Distillation of Specialty Chemicals

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