6999

6541

كارشناسي ارشد

مهندسي شيمي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي

1390

چهارده، 115ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محسن نصر اصفهاني، نسرين اعتصامي

3/7/91

محمد اميري، محمدرضا احساني

1396/09/18

كتابنامه

مهندسي شيمي

مهندسي شيمي

ID6541

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Investigation of the Absorption of CO2 into Nanofluids in Stirred Tank Majid Ghasemi Falavarjani m ghasemifalavarjani@ce iut ac ir March 10 2012 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors M Nasr Esfahany mnasr@cc iut ac ir N Etesami netesami@cc iut ac irAbstractAbsorption of gases into liquid is a prevalent way of reducing or separating a gas component from a gas mixture Extensive research has been carried out to increase the efficiency of absorption process These include addingchemicals to the liquid phase to reduce the mass transfer resistance of liquid phase by chemical reaction additionof microparticles adding nanoparticles to the liquid phase and using external fields like electromagnetic fieldsUsing nanofluid is one of the methods that may increase the mass transfer coefficient in gas absorption process Nanofluids can be used as an effective method for increasing the mass transfer coefficients In this study volumetric mass transfer coefficients KLa in absorption of carbon dioxide into Al2O 3 water and Fe3O4 waternanofluids were investigated An agitated vessel with two disk flat blade turbine impellers and 1 4 l volumeequipped with variable speed DC electromotor and magnetic fields was constructed Volumetric mass transfercoefficients for absorption of carbon dioxide in base fluid and different volume concentrations of Al2O 3 waternanofluid were measured at two different gas flow rates The results showed that the mass transfer coefficientincreased by concentration of Al2O 3 nanoparticles up to 0 05 V V in base fluid for 1 0 l min gas flow rate andconstant speed propeller then remained constant 0 05 to 0 2 V V The mass transfer coefficient increased bypower per unit volume inserted by the propeller for Al2O3 water nanofluid It is suggested that addingnanoparticles to the base fluid may break the bubbles reducing the size of the bubbles and increasing thevolumetric mass transfer coefficient The highest volumetric mass transfer coefficient measured was equal to 0 081 s in 0 05 V V concentration of nanofluid Al2O3 water for 1 0 l min gas flow rate and 1400 rpm propellerspeed At all concentrations of nanofluid 0 01 0 2 V V the volumetric mass transfer coefficient enhancement volumetric mass transfer coefficient of nanofluid to base fluid Ekla initially increased and then decreased vspower per unit volume inserted by the propeller The highest mass transfer coefficient enhancement wasmeasured to be 2 15 in 1150 rpm impeller speed 0 05 V V concentration and 1 0 1 min gas flow rate Theeffects of addition of Fe3O4 magnetic nanoparticles on absorption of carbon dioxide into water were alsoinvestigated The results showed that the mass transfer coefficient increased by concentration of Fe3O4nanoparticles up to 0 005 V V in base fluid for 1 0 l min gas flow rate and constant speed propeller Applying adirect magnetic field intensity of 390 gauss G did not show significant effect on the volumetric mass transfercoefficient of carbon dioxide absorption in pure water and Fe3O4 water nanofluid Keywords Volumetric mass transfer coefficients absorption carbon dioxide nanofluid Al2O3 water Fe3O4 water stirred tank magnetic field

محسن نصر اصفهاني، نسرين اعتصامي

محمد اميري، محمدرضا احساني