INVESTIGATION OF THE EFFECT OF ELECTRIC FIELD ON CO2 ABSORPTION IN WATER/Fe3O4 NANOFLUID

N Hoseini,E Fadaie,Hajar Taheri Afarani,N Etesami,M Nasr Esfahany

doi:10.1590/0104-6632.20190363s20180478

Abstract

Abstract In this study, a novel strategy for controlling the mass transfer rate in a gas-liquid system was reported and used for the industrially important system of CO2 absorption. The strategy used Fe3O4 nanoparticles in the liquid phase and also exerting an external electric field. To demonstrate this approach, a unique experimental set up was applied to form a falling liquid film, which was water, to be in contact with the gas phase, which was pure carbon dioxide. Nanofluid with concentrations less than 0.03% by volume and field intensities of 133, 200, 266 kV/m were used in this study. Experimental results showed that the external electric field was able to remarkably enhance the gas absorption rate in dilute nanofluids, while it deteriorated mass transfer in concentrated nanofluids. In order to explain the results, the viscosity of the nanofluid was also experimentally measured in the presence of the electric field.

Highlights

Gas absorption into the liquid phase is a process of considerable industrial importance and has many applications
The results showed that the enhancement in volumetric mass transfer coefficient increases with the volume fraction of solid magnetite in the presence of a magnetic field
The mass transfer coefficient of CO2 absorption in Fe3O4/Water nanofluid was experimentally measured under an external electric field

Summary

Introduction

Gas absorption into the liquid phase is a process of considerable industrial importance and has many applications. Gas dehydration and selective absorption of H2S in the gas industry, hydrocarbon absorbers for lean oil in refineries, and Ethylene Oxide absorption in the petrochemical industry are some examples of it. This process is defined as contacting a gas mixture with a liquid for the goal of dissolving one or more components of the gas in the liquid phase (Treybal, 2001)

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