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TECHNICAL PAPERS

Dense Gas Thermodynamic Properties of Single and Multicomponent Fluids for Fluid Dynamics Simulations

[+] Author and Article Information
Piero Colonna

Faculty of Design, Engineering and Production, Thermal Power Engineering Section, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands

Paolo Silva

Dipartimento di Energetica, Politecnico di Milano, P.za L. da Vinci, 32, 20133 Milano, Italy

J. Fluids Eng 125(3), 414-427 (Jun 09, 2003) (14 pages) doi:10.1115/1.1567306 History: Received May 28, 2002; Revised October 30, 2002; Online June 09, 2003
Copyright © 2003 by ASME
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References

Figures

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Γ along the critical isotherm calculated by STAN MIX (PRSV EOS) for air (a) and an equimolar aqueous-2propanol mixture (b), a highly nonideal mixture. Air is approximated with a binary mixture of 0.79 nitrogen and 0.21 oxygen (mole fractions).
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Γ along the critical isotherm calculated by STAN MIX (PRSV EOS) for linear siloxanes. Comparisons between pure fluids and mixtures of the same fluids.
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MD4M Γ along several isotherms calculated by STAN MIX (PRSV EOS)
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Γ along the critical isotherm calculated by STAN MIX (PRSV EOS) for several linear (a) and cyclic (b) siloxanes. A comparison between pure fluids and a mixture of the same fluids is also shown (dashed line in (b)).
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Iso-Γ curves in the P−v ( a) and T−s (b) thermodynamic plane for n-Octane (TPSI). Part of a typical ORC thermodynamic cycle is also represented in (b). The turbine expansion transformation for an ORC is qualitatively outlined (dashed line). As it can be noted part of the transformation takes place in the Γ<1 region. All curves are a graphical output from zFLOW .
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An overview of minimum Γ along the critical isotherm predicted by STAN MIX , TPSI and several other equations of state as reported in the literature, 49. □: STAN MIX (PRSV EOS), for several fluids; ▵: TPSI (MEOS), for several fluids; ♦: Martin-Hou, for several fluids; ▸: Hirschfelder et al., for several fluids; •: Benedict-Web-Rubin, for several fluids.
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Comparison between n-Octane Γ along the critical isotherm calculated by STAN MIX (PRSV EOS), TPSI (Starling), and literature values (Martin-Hou EOS), 10
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Comparison between water Γ along the critical isotherm calculated by STAN MIX (PRSV EOS), TPSI (modified Keenan Keys), and literature values (Martin-Hou EOS), 10
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Comparison between nitrogen Γ along the critical isotherm calculated by STAN MIX (PRSV EOS) and literature values (Martin-Hou EOS), 10
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STAN MIX sound speed estimations for R125: comparison with experimental data in Ref. 64. δ%: deviation from experimental data; c: SOUND SPEED VALUES CALCULATED BY S TAN MIX . R125 critical point: Tc=66.25°C;Pc=36.31 bar.
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Hexane TPSI sound speed estimations in the vapor phase versus NIST reference data, 63. δ%: deviation from NIST data; c: TPSI sound speed estimations. Hexane critical point: Tc=232.98°C;Pc=29.27 bar.  
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Water vapor STAN MIX sound speed estimations comparisons with reference data, 62. δ%: deviation from NIST data; c: SOUND SPEED VALUES CALCULATED BY S TAN MIX . Water critical point: Tc=374.14°C;Pc=220.8975 bar.
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Water TPSI sound speed estimations comparison with NIST highly accurate data, 62. δ%: deviation from NIST data; c: TPSI sound speed estimations. Water critical point: Tc=374.15°C;Pc=221 bar.

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