On the Track to Understanding Three Phases in One Tower

Repke, Jens‐Uwe; Ausner, Ilja; Paschke, Steve; Hoffmann, A.; Wozny, Günter

doi:10.1205/cherd06087

Cited by 22 publications

(31 citation statements)

References 12 publications

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“…Due to the interaction between the two liquids, the liquid flow behavior changes dramatically which leads to the uncertainty of the separation efficiencies for the structured packed columns. The liquid flow behavior is an important factor affecting the separation efficiencies; the characteristics of the local flow behavior such as film flow, rivulet flow and droplet flow are required to be studied (Hoffmann et al, 2005;Repke et al, 2007). From the viewpoint of control and operation, the interfacial area for heat and mass transfer as well as the residence time should be increased in order to improve the separation efficiencies for the structured packed columns.…”

Section: Introductionmentioning

confidence: 99%

CFD Study on Liquid Flow Behavior on Inclined Flat Plate Focusing on Effect of Flow Rate

Yuan

Repke

et al. 2012

Engineering Applications of Computational Fluid Mechanics

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ABSTRACT:The factors affecting the separation efficiencies of structured packed columns are multi-scale, including the macroscopic variables (eg feed rate, pressure and temperature) and the microscopic liquid flow behavior and distribution. Especially in the situation in which the second liquid phase is inevitable within distillation columns, the microscopic liquid flow behavior could lead to the uncertainty of the separation efficiencies. This work mainly focuses on the investigation of the local flow behavior of a liquid phase flowing on an inclined steel plate at different situations. On one hand, a three-dimensional CFD model based on the VOF model is developed with the commercial CFD package, FLUENT 6.3. On the other hand, the results of the experimental study are adopted to validate partially the model. Within the developed model, the influences of the liquid and gas flow rates are studied with respect to the specific wetted area, the thickness profile of film and rivulet flows as well as the average velocity of the liquid phase.

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Section: Introductionmentioning

confidence: 99%

CFD Study on Liquid Flow Behavior on Inclined Flat Plate Focusing on Effect of Flow Rate

Yuan

Repke

et al. 2012

Engineering Applications of Computational Fluid Mechanics

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“…The results are presented using non-dimensional Weber numbers defined as the ratio of fluid's inertia to surface tension (We = q L U L 2 e/r) and the contact angle h. Based on visual observation, this figure shows qualitatively that for conditions corresponding to a MEA flow with two different wetting conditions in terms of surface tension or contact angle, the interfacial area differs significantly. One obtains an interfacial area which is either very close to the geometrical area, as observed in experimental measurements for such a high liquid flow rate (Rocha et al, 1996;Repke et al, 2006), or significantly less than the geometric area when "default" VOF parameters are used. This disagreement calls for intensive work on this type of modeling.…”

Section: Simulations On a Small Scalementioning

confidence: 52%

CO₂Capture Cost Reduction: Use of a Multiscale Simulations Strategy for a Multiscale Issue

Raynal

Gomez

Caillat

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Re´duction du couˆt du captage de CO 2 : mise en oeuvre d'une strate´gie de simulations multi-e´chelle pour un proble`me multi-e´chelles -Le captage et le stockage de CO 2 est un moyen important en vue de la re´duction des e´missions de CO 2 (International Energy Agency, 2009). Les proce´de´s de captage en post-combustion utilisant des amines sont conside´re´s parmi les options pre´fe´re´es pour le CSC (Captage et Stockage du Carbone). Cependant, le couˆt du CO 2 e´vite´est tre`s important et doit eˆtre re´duit. Cet article a pour objectif de montrer que la combinaison de diffe´rents outils de simulations re´alise´es a`diffe´rentes e´chelles permet une analyse fine des couˆts du CO 2 et des parame`tres associe´s responsables de ces couˆts a`diffe´rentes e´chelles. Il est tout d'abord montre´, a`partir d'une analyse technico-e´conomique a`l'e´chelle globale du proce´de´, que les couˆts d'investissements repre´sentent pre`s de la moitie´du couˆt du CO 2 total. En se focalisant sur ce dernier couˆt, une analyse de sensibilite´base´e sur des simulations Aspen a`l'e´chelle interme´diaire de l'absorbeur, permet d'identifier les parame`tres cle´s re´gissant le transfert de matie`re et le dimensionnement de la colonne. On montre que le parame`tre le plus important est l'aire interfaciale, les coefficients de transfert de masse en phase gaz et en phase liquide n'ayant que tre`s peu d'influence. Enfin, des simulations CFD (Computational Fluid Dynamics) re´alise´es a`grande et petite e´chelles permettent d'orienter l'optimisation du design des colonnes via, d'une part, l'e´tude de l'interaction entre distributeurs et lit de garnissage, et d'autre part, la de´termination a`l'e´chelle locale de la perte de charge ou de parame`tres de transfert de masse. Une discussion porte sur l'utilisation couple´e de ces diffe´rents moyens de simulations qui permettront a`terme d'aller plus loin dans le de´veloppement de technologies et la re´duction des couˆts de captage du CO 2 .Abstract -CO 2 Capture Cost Reduction: Use of a Multiscale Simulations Strategy for a Multiscale Issue -Carbon Capture and Storage (CCS) is one important option for CO 2 mitigation (International Energy Agency, 2009). Post-combustion capture processes using amines are considered one of the preferred options for CCS. However, the cost of avoided CO 2 is very large and must be reduced. The present article aims to show that combining different simulation tools used on different scales makes possible a fine analysis of CO 2 capture costs and the associated parameters responsible for these costs on different scales. It is first shown, from a macro-scale techno-economic analysis, that investments represent about one half of the total CO 2 cost. Focusing on this cost, a sensitivity analysis, via Aspen calculations performed on a meso-column scale, enables one to identify key mass-transfer parameters that control absorption column design. It is shown that the most important mass-transfer parameter is the interfacial area, the gas and liquid mass transfer coeffi...

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“…The volume-of-fluid-like model in CFX 5.0 was utilized to study the same. The influence of surface tension was taken into account, and the simulation studies were validated with experimental work [10][11][12][13].…”

Section: Cfd Studiesmentioning

confidence: 99%

Analysis of Hydrodynamics of Fluid Flow on Corrugated Sheets of Packing

Subramanian

Wozny

2012

International Journal of Chemical Engineering

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Modelling of the hydrodynamics behaviour of the liquid on the corrugated sheets of packing is studied using three-dimensional, volume-of-fluid (VOF) model that is incorporated in Ansys Fluent 12.0. The flow of three different liquids with different physical properties is modelled. A domain of corrugated sheets of packing resembling the real structured packing with little modifications in the elementary geometry is constructed using ICEM CFD 12.0. The quantitative comparisons of the wetting behavior from the simulations are in good agreement with experiments. Further, the study has been extended to understand the influence of the second corrugated sheet on the flow behavior. The contours from the simulations indicate the liquid hold-up in the crimp of two corrugated sheets, and these results are in good agreement with the earlier experimental studies performed using X-ray tomography in the literature. The result from the simulation shows that even for the high flow rate of around 811 mL/min for silicon-oil (DC5), only 60% of the corrugated sheet has been wetted. Hence, the efficiency of the existing packing can be further increased by increasing the wetted area in the corrugated sheet of packing.

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On the Track to Understanding Three Phases in One Tower

Cited by 22 publications

References 12 publications

CFD Study on Liquid Flow Behavior on Inclined Flat Plate Focusing on Effect of Flow Rate

CFD Study on Liquid Flow Behavior on Inclined Flat Plate Focusing on Effect of Flow Rate

CO₂Capture Cost Reduction: Use of a Multiscale Simulations Strategy for a Multiscale Issue

Analysis of Hydrodynamics of Fluid Flow on Corrugated Sheets of Packing

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On the Track to Understanding Three Phases in One Tower

Cited by 22 publications

References 12 publications

CFD Study on Liquid Flow Behavior on Inclined Flat Plate Focusing on Effect of Flow Rate

CFD Study on Liquid Flow Behavior on Inclined Flat Plate Focusing on Effect of Flow Rate

CO2Capture Cost Reduction: Use of a Multiscale Simulations Strategy for a Multiscale Issue

Analysis of Hydrodynamics of Fluid Flow on Corrugated Sheets of Packing

Contact Info

Product

Resources

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CO₂Capture Cost Reduction: Use of a Multiscale Simulations Strategy for a Multiscale Issue