7625

7097

كارشناسي ارشد

شيمي فيزيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1391

دوازده،82ص.: مصور،جدول،نمودار﴿رنگي﴾

ص.ع.به فارسي و انگليسي

بيژن نجفي

غلامعباس پارسافر

20/1/92

يوسف غائب، حسين فرخ پور

شيمي

ID7097

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Abstract In 1993 Parsafar and Mason developed a new regularity for dense fluids and called it Linear Isotherm Regularity The regularity is that the quantity Z v 2 is linear in 2 where v is the molar density Z is the compressibility factor and defined as Pv RT where v is the molar volume R and T are the gas constant and Kelvin temperature respectively The linearity of Z 1 v 2 was shown to be as Z 1 v 2 A B 2 where A A2 A1 RT The temperature dependency of the intercept and slop were obtained by approximating the average potential energy by summing the contribution from nearest neighbors only assuming single inverse powers for the effective repulsion and attraction Cn Cm N z n m U r r 2 where U is the total potential energy among N molecules z is the average distance between nearest neighbors and Cn and Cm are constants The LIR which is called EOS I in this thesis works well for some nonionic and nonmetallic solids as well as for dense fluids Further investigations showed that EOS I does show some deviations from experiment for extremely nonspherical molecules Also the application of EOS I to alkali metals more specifically liquid cesium suffers within the density range where the metal nonmetal transition occurs In 2008 Moeini showed that EOS I can not predict accurately thermal pressure coefficients and its inaccuracy can be about 20 percent in some cases To find an equation of state for liquid metals in particular liquid cesium Ghatee and Bahadori proposed that an effective potential of the Mie 6 3 form be used with temperature independent coefficients Using arguments analogous to those of Parsafar and Mason in deriving EOS I they obtained the equation of state d Z v 2 c where c a 2 c1 T and d d1 T with d1 and c1 related to the attractive and repulsive part of the effective potential respectively In this thesis we call this equation of state as EOS II Recently it has been shown that EOS II is valid for cesium over its entire liquid range and also for some metallic and ionic solids as well In 2009 Parsafar and his coworkers a simple functional form for a general equation of state based on an effective near neighbor interaction of an extended Lennard Jones 12 6 3 type C T C T C T N z 1212 6 6 3 3 U r 2 r r Using arguments analogous to those of Parsafar and Mason in deriving EOS I they obtained the equation of state f Z v 2 e g 2

بيژن نجفي

غلامعباس پارسافر

يوسف غائب، حسين فرخ پور