Carbon dioxide (CO2) absorption and interfacial mass transfer across vertically confined free liquid film-a numerical investigation

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

doi:10.1016/j.cep.2016.11.002

Cited by 22 publications

(8 citation statements)

References 31 publications

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“…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. By solving a species transport equation, simulation results showed that the average K L value increased 26.9% for the open window region and 17.4% for the wall region below the window, respectively, in comparison to the wall region up the window, and the average K L value of confined free film along the flow direction is about 19.2% higher than the value of wall‐bounded film, which confirms that the use of an open window can significantly enhance mass transfer performance locally and over the entire regions. But the detailed flow mechanism such as interfacial waviness is still not well understood.…”

Section: Introductionmentioning

confidence: 80%

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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: Introductionmentioning

confidence: 80%

“…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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“…Xie et al 14 investigated different perforation geometries, but most of the results concern centimetric rectangular perforations. These so‐called “open windows” are actually novel elements for the gas–liquid contact that show interesting mass‐transfer performances 15,16 . Xie et al 14 found a diversity of flow patterns.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the numerical simulations evidence strong vorticity generation both inside the wavy suspended film and on its free surface. These phenomena contribute to the mass‐transfer intensification observed for the plate with open window (as compared to the unperforated plate) 16 …”

Section: Introductionmentioning

confidence: 99%

Experimental study of a liquid film flowing over a perforation

et al. 2021

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Perforations are one of the recognized geometrical features that contribute to liquid redistribution in corrugated sheet packings. Our experimental study focuses on a simplified but relevant configuration: a thin liquid film flowing on either side of a vertical plate with a circular perforation. We focus on the curtain mode when the liquid fills the perforation. Confocal chromatic imaging reveals a capillary ridge upstream of the perforation, an inertial ridge downstream, and a varicose capillary wave standing on the liquid curtain. We show that the wavelength is selected such that the velocity of the wave both satisfies Taylor's dispersion relation and matches the curtain local speed. We examine the effect of perforation size, supply conditions, and liquid properties on the curtain transition. Lastly, we propose a simple model based on a momentum balance that describes the effect of these parameters on the Reynolds number at which curtain forms.

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“…In addition, DES and other solvents in liquid form at room temperature are difficult to manage. Liquid adsorption material integrated with porous solid materials as supporter can overcome this problem (Gray et al 2012;Hu et al 2017). This integration has promising remarks that may increase CO 2 adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Choline Chloride: Urea onto Mesoporous Silica for Carbon Dioxide Capture

Ghazali

Hassan²,

Yarmo³

et al. 2019

JSM

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A green composite adsorbent based on mesoporous silica-gel (SG) and deep eutectic solvent (DES) mixture of choline chloride-urea (ChCl:U) was synthesized as an alternative for carbon dioxide (CO 2) adsorption. The composite adsorbent was prepared by wet impregnation technique with various ChCl:U (mole ratio 1:2) content in SG at 5-15% (w/w). Fourier transform infrared attenuated total reflectance (ATR-FTIR) results showed successful impregnation of ChCl:U into SG with the presence of C=O carbonyl amide group stretching, N-H scissoring bending, CH 2 bending and C-N stretching peaks. Thermal degradation of the adsorbent started with urea at 130°C followed by ChCl at 300°C. Meanwhile, nitrogen physisorption demonstrated a decrease in specific surface areas of the sorbents with increasing ChCl:U weight percentage due to the blockage of micropores by ChCl:U. The optimum CO 2 adsorption capacity of 22.3 mg/g was achieved by 10%ChCl:U/SG200, which was higher than the immobilised SG200, hence making it relevant to become a green and economical adsorbent for CO 2 capture.

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Carbon dioxide (CO2) absorption and interfacial mass transfer across vertically confined free liquid film-a numerical investigation

Cited by 22 publications

References 31 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 study of a liquid film flowing over a perforation

Immobilization of Choline Chloride: Urea onto Mesoporous Silica for Carbon Dioxide Capture

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