Experimental and Numerical Investigation of CO₂ Absorption Using Nanofluids in a Hollow‐Fiber Membrane Contactor

Abstract

To remove CO 2 from N 2 /CO 2 gas mixtures, a-Al 2 O 3 /water and g-Al 2 O 3 /water nanofluids have been used in a dialysis nanoporous hollow-fiber membrane contactor. The mass transfer coefficient, CO 2 removal efficiency, and CO 2 concentration profile were determined under different operating conditions. The results showed that the addition of a-Al 2 O 3 and g-Al 2 O 3 nanoparticles to the solvent increased the mass transfer rate, and by raising the nanofluid concentration, the removal efficiency enhanced. The process was simulated by means of computational fluid dynamics (CFD) method. The good agreement between CFD predictions and experimental results indicates that the CFD is a reliable tool for optimization of the process.

Research Progress in Gas Separation Using Hollow Fiber Membrane Contactors

“…Ansaripour et al also confirmed this finding by using α-Al 2 O 3 /water and γ-Al 2 O 3 /water nanofluids with a nano-porous hollow fiber dialysis membrane contactor to remove CO 2 from N 2 /CO 2 gas mixtures. The results showed that the increases in the removal efficiency of α-Al 2 O 3 /water and γ-Al 2 O 3 /water nanofluids with a concentration of 0.02 vol% in comparison with distilled water were 12.2% and 21.6%, respectively [85]. Olle et al used functional magnetic nanoparticles to enhance oxygen mass transfer and found that it was increased up to six-fold by a water-based Fe 3 O 4 nanofluid [86].…”

Hollow Fiber Membrane Contactors in CO2 Desorption: A Review

“…144 The improvement of gas solubility into the absorbent by the addition of a third dispersed phase, i.e., nanoparticles, was investigated by several researchers. [145][146][147] However, a few studies have been conducted on CO2 desorption: J.W. Lee et al 148 and Lee et al 149 compared the CO2 regeneration efficiency of nanofluids (Al2O3 and SiO2 nanoparticles dispersed in DI water and methanol) and pure solvents.…”

Effect of Microstructural Features on Mechanical and Magnetic Properties of Austempered High-silicon Ductile Irons

“…7) Especially, microstructural features such as dislocation density, grain size, and the presence of solute atoms and precipitates affect the motion of magnetic domain walls, which, in turn, affects the characteristic magnetic parameters such as coercivity, remanence, hysteresis loss, and saturation magnetization 7,8) Renzetti et al revealed that a decrease in coercivity was resulted from the grain size increment in ferritic-martensitic steel. 9) Similarly, a theoretical work performed by Sablik et al showed that there was a linear relationship between coercivity and the inverse of the grain size.…”