3247

3097

كارشناسي ارشد

﴿ شيمي فيزيك ﴾

اصفهان : دانشگاه صنعتي اصفهان ، دانشكده ي شيمي

1384

دوازده ، 71 ، [I] ص : مصور ، جدول ، نمودار

ص . ع : به فارسي

يوسف غايب، بيژن نجفي

عزت كشاورزي ، غلامعباس پارسا فر

شيمي

ID3097

به فارسي و انگليسي : قابل رويت در نسخه ديجيتال

71AbstractThe Enskog theory which is proposed for the hard sphere potential can be modified for thereal supercritical gases The most well known modification which is proposed by Enskog isthe modified Enskog theory MET which is used of thermal pressure instead of pressure MET can not be applied for the whole temperature density range and also needs to thethermal pressure and accurate virial coefficients of gases at specified density andtemperature In this thesis a new method for the calculation of viscosity of supercriticalgases and refrigerants based on the Enskog theory for hard sphere potential is proposed inwhich the diameter of the potential is taken as a function of temperature and density Forthis reason this method is called effective hard sphere Enskog method It is shown that thismethod can calculate accurately the viscosity of different gases over a wide temperature density range The accuracy of this method in comparison with other well known methodsfor viscosity calculation of gases like MET and excess viscosity function is comparable andin some cases is better about 0 5 percent although the number of its adjustable parametersis less than the other methods In the second part of this thesis thermal expansivity and isothermal compressibility ofsome fluids argon methane and nitrogen over a wide temperature pressure range iscalculated and fitted in precise correlation functions It is possible to get these coefficientswith high accuracy about 0 06 without cumbersome differentiation of complicatedequation of states

يوسف غايب، بيژن نجفي

عزت كشاورزي ، غلامعباس پارسا فر