بررسي تجربي تاثير استفاده از نانو سيالات در فرايند جذب گاز در يك برج آكنده در حضور ميدان مغناطيسي

چكيده انگليسي :

Experimental Investigation on Using of Nanofluids in the Gas Absorption Process in a Packed Column with Magnetic Field Javad salimi j salimi@ce iut ac ir Date of submission September 22 2013 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Masoud Haghshenasfard haghshenas@cc iut ac ir Seyed Gholamreza Etemad etemad@cc iut ac ir Abstract Mass transfer coefficients are important in the design of mass transfer equipment such as distillation towers adsorption and desorption columns and cooling towers Increasing the mass transfer coefficient is caused increased efficiency reduced size and cost of the equipment This thesis is related to the experimental investigation on using of nanofluid in the gas absorption process in a packed column To study the proposed title a glass packed column was design and subsequently fabricated The inner diameter of column is 30mm and the height of the column is 90cm In this work Fe3O4 water SiO2 water and NiO water were used as solvent in the absorption process Effect of gas and liquid flow rates and magnetic field intensity on the mass transfer rate and mass transfer coefficients under different nanoparticles concentration were investigated According to the magnetic properties of Fe3O4 and NiO nanoparticle and polarity of the base fluid molecules we expected that the magnetic field could have the positive effects on the CO2 capture process SiO2 water nanofluid with concentration of 0 05 0 1 0 2 0 5 1 and 1 5 v v Fe3O4 water and NiO water with concentration of 0 002 0 005 0 01 0 05 and 0 1 v v have been used The gas and liquid flow rates in the experiments are 1 and 1 5 lit min for gas phase and 0 2 0 26 and 0 32 lit min for the liquid phase The magnetic filed intensity of 240 and 350 G have been used in direct of falling film The results showed that addition of SiO2 Fe3O4 and NiO nanoparticles increase the mass transfer rate and mass transfer coefficients For SiO2 water nanofluid at concentration of 1 5 vol the enhancement of mass transfer rate and mass transfer coefficient in comparison with pure water was 36 and 17 respectively The optimum concentration of Fe3O4 Water nanofluid is 0 005 which the enhancement of mass transfer rate and mass transfer coefficient in comparison with pure water was 12 and 10 respectively The optimum concentration in the NiO Water nanofluid is 0 01 which in this point the enhancement of mass transfer rate and mass transfer coefficient in comparison with pure water was 9 and 6 respectively In the optimum concentration of nanofluids effective mass transfer rate and mass transfer coefficient of Fe3O4 Water nanofluid were 29 5 and 41 5 higher than those in NiO Water nanofluid Under the magnetic field the maximum enhancement of mass transfer rate in Fe3O4 Water nanofluid with concentration of 0 005 and in NiO Water nanofluid with concentration of 0 01 were 14 and 10 5 respectively Performance of Fe3O4 Water nanofluid for CO2 capture process under magnetic field was better than NiO Water nanofluid Under the magnetic field and in the optimum volume fraction of nanofluids the effective mass transfer rate of Fe3O4 Water nanofluid is about 25 higher than NiO Water nanofluid For Fe3O4 water and NiO water nanofluids at concentration of 0 1 vol with magnetic filed of 350 G the mass transfer rate when the magnetic field is not applied to increase 6 5 and 4 respectively and the mass transfer coefficient increase 9 and 6 respectively Key words packed column mass transfer nanofliud magnetic field PDF created with pdfFactory trial version www pdffactory com

سليمي، جواد

بررسي تجربي تاثير استفاده از نانو سيالات در فرايند جذب گاز در يك برج آكنده در حضور ميدان مغناطيسي