Experimental and numerical mass transfer study of carbon dioxide absorption using Al2O3/water nanofluid in wetted wall column

Rashidi, Hamed; Mamivand, Sajad

doi:10.1016/j.energy.2021.121670

Cited by 33 publications

(10 citation statements)

References 39 publications

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“…However, as the liquid flow rate is larger than 16 m 3 /m 2 •h, the increasing trend of E slows down. This phenomenon agrees with the results reported by Rashidi et al 39…”

Section: Effects Of Liquid Flow Rate On K G a V And Esupporting

confidence: 94%

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

et al. 2022

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In this study, the mass transfer enhancement by nanoparticles during CO 2 absorption process with MDEA solution in a randomly packed tower was investigated. The mass transfer performance of MDEA solution with and without nanoparticles were quantified and analyzed in terms of the volumetric overall mass transfer coefficient (K G a v ). An enhancement factor (E), defined as the ratio of K G a v with and without nanoparticles, was further introduced to evaluate the enhancement effect of the addition of nanoparticles. The effects of TiO 2 nanoparticle concentration, MDEA concentration, liquid flow rate, liquid temperature, inert gas flow rate, and CO 2 loading on K G a v and E were systematically studied in the packed tower. It is found that the maximum value of E can reach 1.37, when the nanoparticle concentration is 0.09 wt %, the liquid flow rate is 21.22 m 3 /m 2 •h, the liquid temperature is 27°C, the MDEA concentration is 30%, the gas flow rate is 7.58 kmol/m 2 •h and the CO 2 loading is 0.2 mol CO 2 /mol MDEA. Usually, the K G a v of the MDEA nanofluids can be increased by 10-37% in a randomly packed tower compared to that of the MDEA solution, which is consistent with the results from the bubbling reactors. However, when the CO 2 loading of absorption exceeds 50%, E becomes less than 1.0, which means that high CO 2 loading inhibits the enhancement effect of nanoparticles. In order to predict the mass transfer performance of MDEA nanofluid, a formula correlating E and various dimensionless operating parameters (i.e. L, T , Ĉnf and ĈMDEA ) is proposed and fitted with an average absolute deviation of 14%.

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“…However, as the liquid flow rate is larger than 16 m 3 /m 2 •h, the increasing trend of E slows down. This phenomenon agrees with the results reported by Rashidi et al 39…”

Section: Effects Of Liquid Flow Rate On K G a V And Esupporting

confidence: 94%

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

et al. 2022

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“…The theory was also approved by Rahmatmand et al in a high-pressure reactor besides the hydrodynamic theory as the dominant transfer mechanism. The theory was also suggested by various studies as the most important mechanism of mass transfer enhancement by nanofluids and mostly the hydrodynamic systems. ,, …”

Section: Introductionmentioning

confidence: 99%

“…The theory was also suggested by various studies as the most important mechanism of mass transfer enhancement by nanofluids and mostly the hydrodynamic systems. 27,31,32 However, most of the reported studies pointed out the fact that the nature of the offered mechanisms for mass transfer by nanofluids is unknown, doubtful, and mysterious. In addition, the previously reported claims were mostly based on the reported mechanisms for heat transfer phenomena, which makes them necessary to be investigated and deeply rationalized by novel approaches.…”

Section: ■ Introductionmentioning

confidence: 99%

Insights Into the Mass Transfer Mechanisms of Nanofluids: A CO₂ Absorption Study

2021

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α-Fe2O3 (hematite) and CuO nanoparticles were synthesized, characterized, and utilized to construct water-based nanofluids capable of CO2 absorption enhancement. The structure, morphology, surface, and bulk properties of the synthesized materials were investigated using field-emission scanning electron microscopy (FE-SEM), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), ζ, dynamic light scattering (DLS), pH, and viscosity analyses and measurements. The unclear and mysterious nature of the mass transfer mechanisms of nanofluids were investigated and confirmed by developing several approaches including new parameters for optimum and equilibrium conditions. The investigations revealed the maximum CO2 absorption enhancement of 63.79 and 38.72% for water–Fe2O3 and water–CuO nanofluids, respectively. A new observation about absorption trends was hypothesized and rationalized to be caused by the variation of surface charges and named the “electrostatic bulk effect”. The approach made it possible to categorize the reported mechanisms into bulky and interfacial groups and gave a concise, clear, and integrated insight into the mass transfer mechanisms, stability concept, and nanofluid component selection standards.

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“…Furthermore, the absorption performance of gasses in ILs is determined from the molar volumes and compressibility values calculated from density. 9,10 Given the significance of studying the physicochemical properties of the ILs to identify appropriate solvents for CO 2 uptake processes, the potential application of various empirical and molecular approaches was provided to estimate ILs properties. 11,12 Recently, Esmaeili et al estimated the surface tension of ILs with good precision based on a simple general equation using Multi-Gene Genetic Programming (MGP).…”

Section: Introductionmentioning

confidence: 99%

“…From an academic perspective, demonstrating the physicochemical properties of the ILs present some knowledge about the behavior, interface specification, and intermolecular interaction between ILs and solvent mixtures. Furthermore, the absorption performance of gasses in ILs is determined from the molar volumes and compressibility values calculated from density 9,10 …”

Section: Introductionmentioning

confidence: 99%

On the prediction of thermo‐physicochemical properties and equilibrium absorption of CO ₂ into aqueous protic monoethanolamine glycinate ionic liquid

Hasanizadeh

Valeh-e-Sheyda

2021

Environ Prog Sustainable Energy

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The utilization of pure ionic liquids (ILs), as environmentally green and soft chemical solvents, is restricted in the CO2 capture industry due to their high viscosity and fair conductivity. In this paper, the novel comprehensive models were developed for accurate estimation of density, dynamic viscosity, surface tension, and electrical conductivity of a novel protic amino acid‐functionalized IL, namely monoethanolamine glycinate, [MEA][GLY], in the temperature range of 303.15–323.15 K at two different intervals of water content (5–20 wt%, and 25–100 wt%). The results of the suggested models revealed that the density, viscosity, and surface tension of [MEA][GLY] decline substantially with rising temperature, while the electrical conductivity presents an adverse trend. Additionally, the impact of varying the concentration on the density and viscosity of the IL solution is more significant than the solution temperature, particularly at high concentrations of the IL. Moreover, a second‐order polynomial equation was suggested to depict the equilibrium pressure dependence of CO2 loading capacity of aqueous [MEA][GLY] in IL, at various equilibrium pressures of 1–7 bar.

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Experimental and numerical mass transfer study of carbon dioxide absorption using Al2O3/water nanofluid in wetted wall column

Cited by 33 publications

References 39 publications

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Insights Into the Mass Transfer Mechanisms of Nanofluids: A CO₂ Absorption Study

On the prediction of thermo‐physicochemical properties and equilibrium absorption of CO ₂ into aqueous protic monoethanolamine glycinate ionic liquid

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Experimental and numerical mass transfer study of carbon dioxide absorption using Al2O3/water nanofluid in wetted wall column

Cited by 33 publications

References 39 publications

Enhancement of mass transfer performance by nanoparticles during the CO2 absorption with MDEA solution in a randomly packed tower

Enhancement of mass transfer performance by nanoparticles during the CO2 absorption with MDEA solution in a randomly packed tower

Insights Into the Mass Transfer Mechanisms of Nanofluids: A CO2 Absorption Study

On the prediction of thermo‐physicochemical properties and equilibrium absorption of CO 2 into aqueous protic monoethanolamine glycinate ionic liquid

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Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Insights Into the Mass Transfer Mechanisms of Nanofluids: A CO₂ Absorption Study

On the prediction of thermo‐physicochemical properties and equilibrium absorption of CO ₂ into aqueous protic monoethanolamine glycinate ionic liquid