D5 !Short name 541-02-6 !CAS number Decamethylcyclopentasiloxane !Full name C10H30O5Si5 !Chemical formula {C10H30O5Si5} D5 !Synonym 370.7697 !Molar mass [g/mol] 226.0 !Triple point temperature [K] 484.060 !Normal boiling point [K] 618.3 !Critical temperature [K] 1093.4 !Critical pressure [kPa] 0.82 !Critical density [mol/L] 0.637 !Acentric factor 1.349 !Dipole moment [Debye]; DIPPR DIADEM 2012 NBP !Default reference state 10.0 !Version number ???? !UN Number :UN: siloxane !Family :Family: ???? !Heating value (upper) [kJ/mol] :Heat: 1S/C10H30O5Si5/c1-16(2)11-17(3,4)13-19(7,8)15-20(9,10)14-18(5,6)12-16/h1-10H3 :InChi: !Standard InChI String XMSXQFUHVRWGNA-UHFFFAOYSA-N !Standard InChI Key :InChiKey: ccbc27e0 !Hash number from InChI Key :Hash: !The fluid files contain general information about the fluid in the first 15 to 20 lines, followed by sections for the ! equations of state, transport equations, and auxiliary equations. Equations of state are listed first. The NIST recommended ! equations begin with a hash mark (#). The secondary equations begin with the @ symbol. These symbols can be swapped to ! select a secondary equation as primary and the primary as secondary. The equation of state section also contains auxiliary ! equations for the ideal gas heat capacity or ideal gas Helmholtz energy. Below the equations of state (both primary and ! secondary) are the transport equations, first viscosity and then thermal conductivity. These are then followed by the ! secondary equations if available. The transport section also contains auxiliary equations required to calculate either the ! dilute gas state or the critical enhancement. At the end of the file are additional but not necessary auxiliary equations, ! including simple equations for the vapor pressure, saturated liquid and vapor densities, melting line (for some fluids), and ! sublimation line (for even fewer fluids). This section also contains the equations for dielectric constant and surface ! tension if available. The sections are divided by different symbols (these being _-+=^*~) to aid the eye in locating a ! particular section. Secondary equations are indented 10 spaces to avoid confusion with the NIST recommended equations. The ! end of the fluid file is marked with @END. Anything below that is ignored. ! compiled by E.W. Lemmon, NIST Physical and Chemical Properties Division, Boulder, Colorado ! 12-22-05 EWL, Original version. ! 08-23-10 IDC, Add ancillary density equations. ! 02-15-11 MLH, Add preliminary transport. ! 04-06-13 EWL, Add dipole moment. ! 04-17-14 EWL, Add surface tension coefficients of Mulero et al. (2014). ! 02-05-16 MLH, Revise transport. ! 02-07-17 MLH, Update transport. ! 04-10-18 MT, Add new EOS and ancillary equations. ! 04-12-18 MLH, Revise transport for new EOS. ________________________________________________________________________________ #EOS !---Equation of state--- FEQ !Helmholtz equation of state for decamethylcyclopentasiloxane of Thol et al. (2018). :TRUECRITICALPOINT: 618.3 0.82 !True EOS critical point [K, mol/L] (where dP/dD=0 and d^2P/dD^2=0 at constant T) :DOI: ? ?``````````````````````````````````````````````````````````````````````````````` ?Thol, M., Javed, M.A., Baumhoegger, E., Span, R., and Vrabec, J., ? "Thermodynamic Properties of Dodecamethylpentasiloxane, ? Tetradecamethylhexasiloxane, and Decamethylcyclopentasiloxane," ? to be submitted to Fluid Phase Equilib., 2018. ? ?The uncertainties in the equation of state are: ? Density in the liquid phase: 0.2%; no data available in the vapor phase. ? Speed of sound in the liquid phase: 0.3 %; 0.4 % in the vapor phase. ? Isobaric heat capacity in the liquid phase at 1 atm: 2 %. ? Vapor pressure: 0.5% for T = 380 - 490 K. ? No other data available. ? !``````````````````````````````````````````````````````````````````````````````` 226.0 !Lower temperature limit [K] 630.0 !Upper temperature limit [K] 125000.0 !Upper pressure limit [kPa] 2.78 !Maximum density [mol/L] CPP !Pointer to Cp0 model 370.7697 !Molar mass [g/mol] 226.0 !Triple point temperature [K] 0.00000286 !Pressure at triple point [kPa] 2.78 !Density at triple point [mol/L] 484.060 !Normal boiling point temperature [K] 0.637 !Acentric factor 618.3 1093.4 0.82 !Tc [K], pc [kPa], rhoc [mol/L] 618.3 0.82 !Reducing parameters [K, mol/L] 8.3144598 !Gas constant [J/mol-K] 10 4 5 12 0 0 0 0 0 0 0 0 !# terms and # coefs/term for normal terms, Gaussian terms, and Gao terms 0.07455534 1. 4. 0. !a(i),t(i),d(i),l(i) 1.806054 0.44 1. 0. -3.279366 0.88 1. 0. -0.8646964 0.86 2. 0. 0.5088117 0.445 3. 0. -4.443945 1.4 1. 2. -1.788601 1.9 3. 2. 0.5585991 0.8 2. 1. -3.814219 1.12 2. 2. -0.07638697 1.04 7. 1. 8.723756 0.88 1. 2. 2. -0.854 -0.358 1.186 0.875 0. 0. 0. -0.002425617 2.74 1. 2. 2. -16.0 -1495.0 1.044 0.937 0. 0. 0. -1.146822 1.04 3. 2. 2. -1.123 -0.3 1.05 0.787 0. 0. 0. -1.500002 0.99 2. 2. 2. -0.915 -0.34 1.3 0.957 0. 0. 0. -2.37615 1.02 2. 2. 2. -1.26 -0.39 0.61 0.554 0. 0. 0. #AUX !---Auxiliary function for Cp0 CPP !Ideal gas heat capacity function for decamethylcyclopentasiloxane of Thol et al. (2018). ? ?``````````````````````````````````````````````````````````````````````````````` ?Thol, M., Javed, M.A., Baumhoegger, E., Span, R., and Vrabec, J., 2018. ? !``````````````````````````````````````````````````````````````````````````````` 0. ! 10000. ! 0. ! 0. ! 1.0 8.3144598 !Reducing parameters for T, Cp0 1 3 0 0 0 0 0 !Nterms: polynomial, exponential, cosh, sinh 4.0 0.0 54.0947 21.0 66.5513 2044.0 36.7748 6590.0 #AUX !---Auxiliary function for PX0 PX0 !Helmholtz energy ideal-gas function for decamethylcyclopentasiloxane of Thol et al. (2018). ? ?``````````````````````````````````````````````````````````````````````````````` ?Thol, M., Javed, M.A., Baumhoegger, E., Span, R., and Vrabec, J., 2018. ? !``````````````````````````````````````````````````````````````````````````````` 1 2 3 0 0 0 0 0 !Nterms: ai*log(tau**ti); ai*tau**ti; ai*log(1-exp(bi*tau)) 3.0 1.0 !ai, ti for [ai*log(tau**ti)] terms 224.3465448833708251 0.0 !aj, ti for [ai*tau**ti] terms -39.6350124660082983 1.0 !aj, ti for [ai*tau**ti] terms 54.0947 21.0 !aj, ti for [ai*log(1-exp(-ti/T)] terms 66.5513 2044.0 36.7748 6590.0 -------------------------------------------------------------------------------- @EOS !---Equation of state--- FE1 !Helmholtz equation of state for decamethylcyclopentasiloxane of Colonna et al. (2006). :DOI: 10.1016/j.fluid.2006.04.015 ? ?``````````````````````````````````````````````````````````````````````````````` ?Colonna, P., Nannan, N.R., Guardone, A., Lemmon, E.W., ? Multiparameter Equations of State for Selected Siloxanes, ? Fluid Phase Equilibria, 244:193-211, 2006. ? !``````````````````````````````````````````````````````````````````````````````` 300.0 !Lower temperature limit [K] 673.0 !Upper temperature limit [K] 30000.0 !Upper pressure limit [kPa] 2.83 !Maximum density [mol/L] CP1 !Pointer to Cp0 model 370.7697 !Molar mass [g/mol] 226.0 !Triple point temperature [K] 0.000005304 !Pressure at triple point [kPa] 2.83 !Density at triple point [mol/L] 484.05 !Normal boiling point temperature [K] 0.658 !Acentric factor 619.23462341 1161.46 0.78909027 !Tc [K], pc [kPa], rhoc [mol/L] 619.23462341 0.78909027 !Reducing parameters [K, mol/L] 8.314472 !Gas constant [J/mol-K] 12 4 0 0 0 0 0 0 0 0 0 0 !# terms and # coefs/term for normal terms, Gaussian terms, and Gao terms 1.40844725 0.25 1. 0. !a(i),t(i),d(i),l(i) -2.29248044 1.125 1. 0. 0.42851607 1.5 1. 0. -0.73506382 1.375 2. 0. 0.16103808 0.25 3. 0. 0.00029643278 0.875 7. 0. 0.82412481 0.625 2. 1. 0.15214274 1.75 5. 1. -0.68495890 3.625 1. 2. -0.055703624 3.625 4. 2. 0.013055391 14.5 3. 3. -0.031853761 12.0 4. 3. @AUX !---Auxiliary function for Cp0 CP1 !Ideal gas heat capacity function for decamethylcyclopentasiloxane of Colonna et al. (2006). ? ?``````````````````````````````````````````````````````````````````````````````` ?Colonna, P., Nannan, N.R., Guardone, A., Lemmon, E.W., ? !``````````````````````````````````````````````````````````````````````````````` 0. ! 10000. ! 0. ! 0. ! 1.0 1.0 !Reducing parameters for T, Cp0 4 0 0 0 0 0 0 !Nterms: polynomial, exponential, cosh, sinh -34.898 0.0 1.8615 1.0 -0.0014034 2.0 5.e-7 3.0 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ #TRN !---ECS Transport--- ECS !Extended Corresponding States model (Nitrogen reference); fit to limited data for D5. :DOI: 10.6028/NIST.IR.8209 ? ?``````````````````````````````````````````````````````````````````````````````` ?Huber, M.L., "Models for the Viscosity, Thermal Conductivity, and Surface Tension ? of Selected Pure Fluids as Implemented in REFPROP v10.0," NISTIR 8209, 2018. ? doi: 10.6028/NIST.IR.8209 ? ?VISCOSITY ? Abbas, R., Ihmels, E.C., Enders, S., and Gmehling, J., "Measurement of Transport Properties for Selected Siloxanes and their Mixtures Used as Working Fluids for Organic Rankine Cycles," Ind. Eng. Chem. Res., 50:8756-8763, 2011. ? Palczewska-Tulinska, M. and Oracz, P., "Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane," J. Chem. Eng. Data, 50(5):1711-1719, 2005. ? ?Estimated uncertainty: the uncertainty in the liquid phase at ? atmospheric pressure is estimated to be 5% at temperatures between 300 K ? and 500 K, rising to 10% at higher temperatures and pressures to 10 MPa. ? Vapor phase data unavailable; estimated uncertainty is 10%. ? ?THERMAL CONDUCTIVITY ? Abbas, R., Ihmels, E.C., Enders, S., and Gmehling, J., "Measurement of Transport Properties for Selected Siloxanes and their Mixtures Used as Working Fluids for Organic Rankine Cycles," Ind. Eng. Chem. Res., 50:8756-8763, 2011. ? Palczewska-Tulinska, M., Oracz, P., "Selected Physicochemical Properties of Hexamethylcyclotrisiloxane, Octamethylcyclotetrasiloxane, and Decamethylcyclopentasiloxane," J. Chem. Eng. Data, 50(5):1711-1719, 2005. ? ?Estimated uncertainty: the estimated uncertainty for the liquid phase at ? temperatures to 500 K and pressures to 10 MPa is 5%, larger at higher ? temperatures and pressures. Estimated uncertainty in vapor phase is 25%. ? ?The Lennard-Jones parameters were estimated with the method of Chung. ? !``````````````````````````````````````````````````````````````````````````````` 226. !Lower temperature limit [K] 673.0 !Upper temperature limit [K] 10000.0 !Upper pressure limit [kPa] 4.0 !Maximum density [mol/L] FEQ NITROGEN.FLD VS1 !Model for reference fluid viscosity TC1 !Model for reference fluid thermal conductivity NUL !Large molecule identifier 1 !Lennard-Jones flag (0 or 1) (0 => use estimates) 0.864 !Lennard-Jones coefficient sigma [nm] for ECS method 491.0 !Lennard-Jones coefficient epsilon/kappa [K] for ECS method 1 0 0 !Number of terms in f_int term in Eucken correlation, spare1, spare2 0.00132 0. 0. 0. !Coefficient, power of T, spare1, spare2 4 0 0 !Number of terms in psi (visc shape factor): poly,spare1,spare2 -2.49055 0. 0. 0. !Coefficient, power of Tr, power of Dr, spare 4.63356 0. 1. 0. !Coefficient, power of Tr, power of Dr, spare -1.89292 0. 2. 0. !Coefficient, power of Tr, power of Dr, spare 0.247782 0. 3. 0. !Coefficient, power of Tr, power of Dr, spare 2 0 0 !Number of terms in chi (t.c. shape factor): poly,spare1,spare2 1.40287 0. 0. 0. !Coefficient, power of Tr, power of Dr, spare 0.0940128 0. 1. 0. !Coefficient, power of Tr, power of Dr, spare TK3 !Pointer to critical enhancement auxiliary function #AUX !---Auxiliary function for the thermal conductivity critical enhancement TK3 !Simplified thermal conductivity critical enhancement for D5 of Perkins et al. (2013). ? ?``````````````````````````````````````````````````````````````````````````````` ?Perkins, R.A., Sengers, J.V., Abdulagatov, I.M., and Huber, M.L., ? "Simplified Model for the Critical Thermal-Conductivity Enhancement in Molecular Fluids," ? Int. J. Thermophys., 34(2):191-212, 2013. doi: 10.1007/s10765-013-1409-z ? !``````````````````````````````````````````````````````````````````````````````` 0. ! 10000. ! 0. ! 0. ! 9 0 0 0 !# terms: terms, spare, spare, spare 1.0 1.0 1.0 !Reducing parameters for T, rho, tcx [mW/(m-K)] 0.63 !Nu (universal exponent) 1.239 !Gamma (universal exponent) 1.02 !R0 (universal amplitude) 0.063 !Z (universal exponent--not used for t.c., only viscosity) 1.0 !C (constant in viscosity eqn = 1/[2 - (alpha + gamma)/(2*nu)], but often set to 1) 0.319e-9 !Xi0 (amplitude) [m] 0.064 !Gam0 (amplitude) [-] 1.068-9 !Qd_inverse (modified effective cutoff parameter) [m] 927.45 !Tref (reference temperature) [K] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #STN !---Surface tension--- ST1 !Surface tension model for D5 of Mulero et al. (2014). :DOI: 10.1063/1.4878755 ? ?``````````````````````````````````````````````````````````````````````````````` ?Mulero, A. and Cachadiņa, I., ? "Recommended Correlations for the Surface Tension of Several Fluids ? Included in the REFPROP Program," ? J. Phys. Chem. Ref. Data, 43, 023104, 2014. ? doi: 10.1063/1.4878755 ? !``````````````````````````````````````````````````````````````````````````````` 0. ! 10000. ! 0. ! 0. ! 1 !Number of terms in surface tension model 619.15 !Critical temperature used in fit (dummy) 0.04408 1.357 !Sigma0 and n #PS !---Vapor pressure--- PS5 !Vapor pressure equation for D5 of Thol et al. (2018). ? ?``````````````````````````````````````````````````````````````````````````````` ?Thol, M., Javed, M.A., Baumhoegger, E., Span, R., and Vrabec, J., 2018. ? ?Functional Form: P=Pc*EXP[SUM(Ni*Theta^ti)*Tc/T] where Theta=1-T/Tc, Tc and Pc ? are the reducing parameters below, which are followed by rows containing Ni and ti. ? !``````````````````````````````````````````````````````````````````````````````` 0. ! 10000. ! 0. ! 0. ! 618.3 1093.4 !Reducing parameters 6 0 0 0 0 0 !Number of terms in equation -9.5401 1.0 !Coefficients and exponents 5.1811 1.5 -10.710 2.07 -17.176 3.17 14.54 2.6 -11.28 16.3 #DL !---Saturated liquid density--- DL1 !Saturated liquid density equation for D5 of Thol et al. (2018). ? ?``````````````````````````````````````````````````````````````````````````````` ?Thol, M., Javed, M.A., Baumhoegger, E., Span, R., and Vrabec, J., 2018. ? ?Functional Form: D=Dc*[1+SUM(Ni*Theta^ti)] where Theta=1-T/Tc, Tc and Dc are ? the reducing parameters below, which are followed by rows containing Ni and ti. ? !``````````````````````````````````````````````````````````````````````````````` 0. ! 10000. ! 0. ! 0. ! 618.3 0.82 !Reducing parameters 5 0 0 0 0 0 !Number of terms in equation 3.4054 0.424 !Coefficients and exponents -2.5800 0.88 3.3694 1.425 -1.53378 2.122 0.53195 3.138 #DV !---Saturated vapor density--- DV3 !Saturated vapor density equation for D5 of Thol et al. (2018). ? ?``````````````````````````````````````````````````````````````````````````````` ?Thol, M., Javed, M.A., Baumhoegger, E., Span, R., and Vrabec, J., 2018. ? ?Functional Form: D=Dc*EXP[SUM(Ni*Theta^ti)] where Theta=1-T/Tc, Tc and Dc are ? the reducing parameters below, which are followed by rows containing Ni and ti. ? !``````````````````````````````````````````````````````````````````````````````` 0. ! 10000. ! 0. ! 0. ! 618.3 0.82 !Reducing parameters 6 0 0 0 0 0 !Number of terms in equation -4.019114 0.442 !Coefficients and exponents -6.19194 1.190 -25.509 2.854 -151.51 6.14 85.8 6.87 -205.896 12.358 @END c 1 2 3 4 5 6 7 8 c2345678901234567890123456789012345678901234567890123456789012345678901234567890