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The fluid viscosity and thermal conductivity are evaluated using the method proposed in [9][13]. The viscosity (measured in μPoise) is related to the absolute temperature through the formula: FM 1/2T1/2 μ=40.785 c w where Mw is the molecular weight in g/mol and Vc is the critical volume in cm3/mol. The coefficient Fc is given by V 2 / 3Ω v (Eq.8) F =1−0.2756ω+0.059035δ4 +ξ cr where ω is the acentric factor, δr is a dimensionless dipole moment, δr =131.3 δ (V T ) with δ measured in Debyes, and ξ is a special correction for highly polar substances. The viscosity collision integral Ωv is provided by cc 1/2 (Eq.9) (Eq.10) *−B * * Ω =[A(T ) ]+[Cexp(−DT )]+[Eexp(−FT )] where T* =1.2593(T /T ), A=1.16145, C=0.52487, c F=2.43787 The thermal conductivity κ is provided by: κMw =3.75Ψ μCv Cv /R (Eq.11) E=2.16178 and (Eq. 12) v D=0.77320, where Mw is the molecular weight in Kg/mol, cv is the constant volume specific heat in J/(mol K), R is the universal gas constant in J/(mol K), and the coefficient Ψ is: Ψ =1+α 0.215+0.28288α1 −1.061β +0.26665Ξ 1 0.6366 + βΞ +1.061α1β (Eq. 13) with α =(C /R)−3/2; β=0.7862−0.7109ω+1.3168ω2; Ξ=2.0+10.5(T/T)2. 1vc 2.3. Flow solvers 2.3.1. Structured solver A CFD structured code (property of the Fluid Dynamic Lab of Department of Engineering for Innovation, University of Salento) has been modified to compute dense gases 38PDF Image | ANALYSIS AND OPTIMIZATION OF DENSE GAS FLOWS: APPLICATION TO ORGANIC RANKINE CYCLES TURBINES
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