WTT User's Guide
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Model for Viscosity (Gas)

Where appropriate, this web application obtains thermophysical property recommendations using REFPROP. REFPROP is an acronym for REFerence fluid PROPerties. This program, developed by the National Institute of Standards and Technology (NIST), provides tables and plots of the thermodynamic and transport properties of industrially important fluids and their mixtures with an emphasis on refrigerants and hydrocarbons, especially natural gas systems.

REFPROP is based on the most accurate pure fluid and mixture models currently available. It implements three models for the thermodynamic properties of pure fluids: equations of state explicit in Helmholtz energy, the modified Benedict-Webb-Rubin equation of state, and an extended corresponding states (ECS) model. By using an equation of state to represent thermodynamic properties, a wide range of fluid properties are guarenteed to display thermodynamic consistency. Viscosity and thermal conductivity are modeled with either fluid-specific correlations, an ECS method, or in some cases the friction theory method.

For more information on REFPROP, please refer to REFPROP Frequently Asked Questions (FAQ) or the REFPROP Users' Guide. In order to cite results from REFPROP models in scientific publications, users should refer to [30]. For information on obtaining a stand-alone version of the application and associated Fortran computational libraries, please see the REFPROP page from Standard Reference Data.

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