Numerical investigation on hydrodynamics of vertically confined free film

Hu, Jianguang; Yang, Xiaogang; Yu, Jianguo; Dai, Guohao

doi:10.1002/cjce.22382

Cited by 13 publications

(9 citation statements)

References 30 publications

(37 reference statements)

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“…According to Lin's, at a slightly larger Weber number than the transition Weber numbers, the surface tension suppresses the varicose waves but promotes the sinuous waves, which are the vehicle of absolute instability. As mentioned by Hu, the region of the lower‐wall plate promotes both varicose and sinuous wavy behavior of the confined free film, while the open‐window region assists the exciting of the film wave motion in the lower‐wall region. This can be explained by a mutual promotion and restraint between wave profile in the window and distribution of liquid flow on two sides of lower wall.…”

Section: Numerical Resultsmentioning

confidence: 94%

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Numerical simulation on flow behavior of twin‐liquid films over a vertical plate with an open window

Xie

Dai

2017

AIChE Journal

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A novel element for gas–liquid contact, a plate with rectangular windows was designed to enhance absorption process. Coexistence and interaction of wall‐bounded films and confined free films named as “twin‐liquid films” were observed on the plate. Volume of fluid (VOF) method was used to simulate its flow behavior. Flow phenomena such as flow around a step‐in, jet impingement, varicose waves, and sinuous waves were observed. Different from thin films flow on an unperforated plate, larger mean velocity, thinner film thickness, more intensive capillary waves, and stronger vorticity on the free surfaces were detected inside the window, and the disturbances could propagate over the whole plate. Three‐dimensional simulation results generally agreed with our experimental observations and further demonstrated complex wavy structures both inside and outside the window. The results would broaden traditional knowledge of liquid films flow and clarify the mechanism of mass transfer intensification for the plate with windows. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1458–1468, 2018

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Section: Numerical Resultsmentioning

confidence: 94%

“…Later, Hu et al analyzed the primary characteristics of the “confined free film” with two‐dimensional (2D) numerical simulations. It was revealed that there exist two types of vortices inside the film, inner vortices and interfacial vortices, which is well related to local mass transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on flow behavior of twin‐liquid films over a vertical plate with an open window

Xie

Dai

2017

AIChE Journal

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“…Eng . mention XRD to characterize polymers, composite materials, catalysts, membranes, minerals, and medicinal drugs, which makes it one of the most used spectrometries.…”

Section: Introductionmentioning

confidence: 99%

Experimental methods in chemical engineering: X‐ray diffraction spectroscopy—XRD

et al. 2020

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X-ray diffraction (XRD) analysis identifies the long-range order (ie, the structure) of crystalline materials and the short-range order of non-crystalline materials. From this information we deduce lattice constants and phases, average grain size, degree of crystallinity, and crystal defects. Advanced XRD provides information about strain, texture, crystalline symmetry, and electron density. When radiation impinges upon a solid, coherent scattering of the radiation by periodically spaced atoms results in scattered beams that produce spot patterns from single crystalline samples and ring patterns from polycrystalline samples. The pattern, intensities of the diffraction maxima (peaks or lines), and their position (Bragg angle θ or interplanar spacing d hkl ), correlate to a specific crystal structure. In 2016 and 2017 close to 100 000 articles mention XRD-more than any other analytical technique, and it was the top analytical technique of researchers that published in Can. J. Chem. Eng. A bibliographic analysis based on the Web of Science groups articles referring to XRD into five clusters: the largest cluster includes research on nanoparticles, thin films, and optical properties; composites, electro-chemistry, and synthesis are topics of the second largest cluster; crystal morphology and catalysis are next; photocatalysis and solar cells comprise the fourth largest cluster; and, waste water is among the topics of the cluster with the least number of occurrences. Researchers publishing in Can. J. Chem. Eng. focus most of the XRD analyses to characterize polymers, nanocomposite materials, and catalysts. K E Y W O R D Scrystallinity, Debye-Scherrer method, limit of quantification, nanoparticle, XRD

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“…4 Numerous effort has been done to predicate the mass transfer process and obtaining knowledge of the absorption process for an FFR. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The mass transfer rates are investigated for the wavy and smooth falling film. The investigation has shown that the mass transfer rate was bigger for the wavy film and mass transfer characteristics varied substantially with the wave regime.…”

Section: Introduction *mentioning

confidence: 99%

“…[6][7][8][9] The film hydrodynamics, such as the velocity distributions and the vorticity variations at different positions of the wavy falling films, have been enhanced the mass transfer process. 10 The analytical and numerical model has been applied to model FFR [6][7][8][9][10][11][12] and FFR could be simulated by means of COMSOL Multiphysics. 13,14 Generally, the two-film theory is used to describe gas absorption.…”

Section: Introduction *mentioning

confidence: 99%

Response surface historical method, simulation of CO2 absorption process by DEA in FFR using COMSOL multiphysics

MALEKI¹,

ZARINABADI²,

Azimi³

et al. 2021

Rev.Roum.Chim.

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Absorption of carbon dioxide as a greenhouse gas from a mixture of CO2 and N2 in a continuous falling film reactor (FFR) has been designed and developed. The reactor length and inner diameter were 1m and 0.021m, respectively. In this paper, the absorption of CO2 by DEA (Diethanolamine) in FFR is studied by means of COMSOL Multiphysics and Design expert. Design expert is used to developing an empirical equation for CO2 absorption when reacting with DEA. The simulation is performed with COMSOL Multiphysics for a second-order reaction and the velocity profile is considered the effect of shear stress. The result shows that the penetration depth of CO2 in the falling film reactor is 0.006mm and the absorption rate increases with increasing gas flow velocity and inlet CO2 concentration. Also, this study is performed on low Reynolds number (1 ≤ ReG ≤ 6 and 4 ≤ ReL ≤ 40 at 298 K) which has not been considered by other researchers.

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Numerical investigation on hydrodynamics of vertically confined free film

Cited by 13 publications

References 30 publications

Numerical simulation on flow behavior of twin‐liquid films over a vertical plate with an open window

Numerical simulation on flow behavior of twin‐liquid films over a vertical plate with an open window

Experimental methods in chemical engineering: X‐ray diffraction spectroscopy—XRD

Response surface historical method, simulation of CO2 absorption process by DEA in FFR using COMSOL multiphysics

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