CO₂ Absorption Using Nanofluids in a Wetted‐Wall Column with External Magnetic Field

Abstract

A new method for enhancing the mass transfer coefficient in the gas absorption process is reported. CO2 absorption experiments were carried out in a wetted‐wall column using different aqueous nanofluids as the solvent. The mass transfer characteristics were found to increase by applying Al2O3/water nanofluid. The mass transfer coefficient decreased with TiO2/water nanofluid. In the case of Fe3O4/water nanofluid, the mass transfer rate was enhanced by increasing the nanoparticle volume fraction, but the mass transfer coefficient was lower than that obtained with water for all experimental conditions studied. Finally, applying a downward magnetic field resulted in higher mass flux and mass transfer coefficient in comparison with experiments without a magnetic field.

CO2 absorption/regeneration enhancement in DI water with suspended nanoparticles for energy conversion application

“…Lu et al [16] suggested a theoretical model that considered micro-convection caused by Brownian motion to shed light on the absorption enhancement by nano-particles. Samadi et al [17] suggested a new type of gas absorber, which is a wetted-wall column with external magnets. It was reported that CO 2 mass transfer flux and mass transfer coefficient increased by 22.35% and 59%, respectively, for Fe 3 O 4 /water nanofluids with magnetic fields.…”

“…Furthermore, the nanoparticles crash the bubbles and produce smaller bubbles, which increase the mass transfer during the bubble absorption process [10][11][12][13][14][15][16][17]. It is reported that the use of nanofluids enhances the CO 2 absorption rate [11][12][13][14][15][16][17].…”

“…It was reported that CO 2 mass transfer flux and mass transfer coefficient increased by 22.35% and 59%, respectively, for Fe 3 O 4 /water nanofluids with magnetic fields. While there are many studies on the CO 2 absorption enhancement [7][8][9][10][11][12][13][14][15][16][17], there is no research on CO 2 regeneration performance enhancement by using the nanofluids. Generally, the regeneration process in physical absorption mode needs the energy input.…”

Reactive absorption in packed bed columns in the presence of magnetic nanoparticles and magnetic field: Modeling and simulation

“…Samadi et al [11] reported a mass-transfer coefficient enhancement for CO 2 absorption system in the presence of different magnetic fields in a wetted-wall column. They reported that magnetic nanoparticles and direction of the magnetic field play important roles in the enhancement of mass-transfer rate.…”

“…In the present work, Shliomis magnetization model [21] was used, because of its accuracy for small magnetic field intensities. The dimensionless form of the magnetization equation can be expressed as follows: 13 (11) …”