چكيده به لاتين
Nowadays, due to the increasing expansion of nanotechnology, nanofluids are presented as fluids with high mass transfer coefficients. The advantage of using such solutions instead of the usual solutions that are used to absorb Green Houe Gases (GHGs) is to improve the parameters affecting mass transfer, namely, improving the transfer interface and increasing the mass transfer coefficient. By increasing these amounts, not only demands for the solvent in the absorption processes will be reduced, but also the desorption energy and the cost of the initial construction of chemical units is also reduced and the plan's economy improves.
Previous studies, have studied the effects of nanoparticle concentration on the absorption enhancement factor, the reduction of this factor for concentrations, by examining different types of nanofluids, four general mechanisms of microconvection, grazing effect, hydrodynamic effect and grinding of bubbles, in order to justify the upgrades. Highly reported.
The research was carried out by synthesizing two nanoparticles (iron oxide and copper oxide) which are not previously studied for this purpose. These NPs were tried to be synthesized with close geometric properties and are used for making aquos nanofluids after fine distribution in DI water as the base solvent using ultrasonic waves, the effect of using named nanofluids on improving the mass transfer in the process of absorbing carbon dioxide gas in the nebulized reactor, it examined the pure base fluid state and examined the effect of changes in nanoparticle concentrations on the enhancement factors in both types of nano-fluids in order to find the optimal range for designing the test, as well as to accurately identify and justify the mechanisms for improving the transfer. This review, except for the above, includes examining the effect of changing the time of applying ultrasonic waves on stability and the absorption enhancement factors, which not only determines the maximum interval, but also serves as a reason for verifying previous claims.
According to the results of the studies, the effect of concentration has caused two incremental peaks in the amount of absorption enhancement and dual reductive peaks, which the first increasing peak is attributed to the microconnection mechanism, then the grazing effect mechanism and the first reduction due to the bulk electrostatic inhibition and the final reduction is due to the viscosity prevention and effects. In general, the optimal range to maximize absorption enhancement is between 0.02 and 0.04% by weight, in various operating conditions, it is possible to achieve 53% and 44% improvement in absorption relative to pure solvent. Regarding to the innovation in the use of ultrasonic and concentration modifications to identify the mechanisms for mass transfer, the main suggestion for future projects is synthesis of superhydrophil and superhydrophoil nanoparticles to investigate and model the mechanisms.
