Thin film flow over structured packings at moderate Reynolds numbers

Valluri, Prashant; Matar, Omar; Hewitt, Geoffrey F.; Mendes, M. A.

doi:10.1016/j.ces.2004.12.008

Cited by 99 publications

(57 citation statements)

References 36 publications

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“…The task of the first program is to solve Equations (1-9) and Equations (13)(14)(15)(16)(17)(18)(19)(20) and find the velocity distribution of gas and liquid in each part of the column. Having the velocity distribution in liquid and gas, the second program is used to solve governing equations relating to the mass and heat transfers (28-49).…”

Section: Resultsmentioning

confidence: 99%

“…The following calculations were carried out for all the segments starting with the first segment for which (at the bottom of the column) the conditions of entering gas and exiting liquid are known. -The space of the segment was discretized in and directions and mass balance Equations (28) through (35), which included velocity distribution, Equations (13)(14)(15)(16)(17)(18)(19)(20), and energy balance, Equation (38), with their boundary conditions of (44) through (48) were applied in each point of discretized space.…”

Section: Methods Of Solutionmentioning

confidence: 99%

“…Thin film flow over structured packings was also studied by Prashant Valluri in 2005. The model describes the dynamic evolution of waves on laminar falling wavy films at low to moderate Reynolds numbers over corrugated surfaces [20]. Recently, in 2007, a multi-scale approach was used by Raynal for CFD calculations of gas-liquid flow within a large-size column equipped with structured packing.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Separation Performance of a Structured Packed Column with a Tray-Type Column for H₂S and CO₂

Baniadam

Fathikalajahi

Rahimpour

2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Comparaison des performances de séparation d'une colonne à garnissage structurée avec celles d'une colonne à plateaux pour l'H 2 S et le CO 2 -L'absorption de gaz acides, H 2 S et CO 2 , par la méthyldiéthanolamine dans une colonne à garnissage structure équipée du Montz-Pak A3-500 a été modélisée mathématiquement. Les dimensions des canaux ainsi que leur nombre et le modèle d'écoulement du film liquide sont similaires à ceux des travaux de Shilkin. Les équations de transfert de la chaleur et de la masse sont dérivées pour le film liquide de réaction et le gaz qui s'écoule à contrecourant dans la colonne. La répartition de la concentration est calculée sur tout le film liquide en mouvement et aucune zone présentant des conditions de concentration équilibrée n'est prise en compte dans le liquide réactif. Les résultats du modèle pour la colonne structurée montrent de meilleures performances d'absorption du H 2 S qu'avec une colonne à plateaux dans les mêmes conditions. Les résultats obtenus par le modèle indiquent une répartition appréciable de la répartition de la concentration et de la température le long de la colonne. Abstract -Comparison of Separation Performance of a Structured Packed Column with a Tray-Type

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Section: Resultsmentioning

confidence: 99%

Section: Methods Of Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of Separation Performance of a Structured Packed Column with a Tray-Type Column for H₂S and CO₂

Baniadam

Fathikalajahi

Rahimpour

2009

Oil & Gas Science and Technology - Rev. IFP

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“…For Mellapak 250.Y, its micro surface structure is usually represented as a doubly sinusoidal-shaped wall [2,10] , with the periodic length and amplitude being 2.8 and 0.3 mm, respectively. As illustrated in Fig.4, the microstructure of structured packing is important for remaining a stable wetting liquid film.…”

Section: Validationmentioning

confidence: 99%

“…Vaporliquid hydrodynamics determines the fluid-dynamic limits of the column and controls mass transfer rates. This is the main purpose of unit operations [2] . Thus, an accurate understanding of film hydrodynamics in structured packing is of great importance in column design.…”

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confidence: 99%

CFD simulation of film flow and gas/liquid counter-current flow on structured packing

Gao

Zhang

2011

Trans. Tianjin Univ.

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Abstract：A mathematic model of two-phase flow and a physical model of two-dimensional (2D) vertical section for the plate-type structured packing Mellapak 250.Y were set up and verified. The models were used to study the influence of packing's surface microstructure on the continuity of liquid film and the amount of liquid holdup. Simulation results show that the round corner shape and micro wavy structure are favorable in remaining the continuity of liquid film and increasing the amount of liquid holdup. The appropriate liquid flow rate was determined by investigating different liquid loadings to obtain an unbroken liquid film on the packing surface. The pressure difference between inlet and outlet for gas phase allowed gas and liquid to flow countercurrently in a 2D computational domain. The direction change of gas flow occurred near the phase interface area. Keywords：two-dimension; computational fluid dynamics(CFD); film distribution; countercurrent flow Structured packings have been widely recognized as high-efficiency and high-capacity gas-liquid contact devices for heat and mass transfer compared with traditional random packings and trays. Their mechanical structure is complex in both macrostructure and microstructure [1] . The macrostructure is of channel geometry, such as a corrugated sheet, creating a mixing cell for the bulk flow of the vapor phase. The microstructure, sometimes known as the texture of packings, plays an important role in remaining a stable wetting liquid film. Vaporliquid hydrodynamics determines the fluid-dynamic limits of the column and controls mass transfer rates. This is the main purpose of unit operations [2] . Thus, an accurate understanding of film hydrodynamics in structured packing is of great importance in column design.Because the small scale of structure and complex flow patterns make the experiments difficult to perform with conventional techniques, computational fluid dynamics (CFD) is adopted to describe and analyze the influence of various parameters. From the micro viewpoint, the liquid film flow on structured packing, for example, the rivulets flowing process on the inclined flat or corrugated board, has been widely studied theoretically and experimentally [3][4][5][6][7] . Furthermore, two-dimensional (2D) gas-liquid simulations for structured packings using the volume of fluid (VOF) model, referred to as the CFD methods, for liquid film flow on inclined plate have been well documented in recent years [8][9][10][11] . Nevertheless, most of the studies focus on deriving the liquid holdup, interfacial area and pressure drop of the packing.Herein, the main purpose of this paper is to ascertain the feasibility of CFD method for 2D two-phase film flows. With validated methods the wall surface (such as the shape of corrugated plate corner, the micro wavy structure), different liquid flow rates and the method to obtain gas-liquid countercurrent flow, are investigated.

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AdvancingCCSUTechnologies with Computational Fluid Dynamics (CFD): A Look at the Future by LinkingCFDand Process Simulations

Sebastia‐Saez

Mechleri

Arellano‐García

2021

Engineering Solutions for CO2 Conversion

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Thin film flow over structured packings at moderate Reynolds numbers

Cited by 99 publications

References 36 publications

Comparison of Separation Performance of a Structured Packed Column with a Tray-Type Column for H₂S and CO₂

Comparison of Separation Performance of a Structured Packed Column with a Tray-Type Column for H₂S and CO₂

CFD simulation of film flow and gas/liquid counter-current flow on structured packing

AdvancingCCSUTechnologies with Computational Fluid Dynamics (CFD): A Look at the Future by LinkingCFDand Process Simulations

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Thin film flow over structured packings at moderate Reynolds numbers

Cited by 99 publications

References 36 publications

Comparison of Separation Performance of a Structured Packed Column with a Tray-Type Column for H2S and CO2

Comparison of Separation Performance of a Structured Packed Column with a Tray-Type Column for H2S and CO2

CFD simulation of film flow and gas/liquid counter-current flow on structured packing

AdvancingCCSUTechnologies with Computational Fluid Dynamics (CFD): A Look at the Future by LinkingCFDand Process Simulations

Contact Info

Product

Resources

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Comparison of Separation Performance of a Structured Packed Column with a Tray-Type Column for H₂S and CO₂

Comparison of Separation Performance of a Structured Packed Column with a Tray-Type Column for H₂S and CO₂