Nist fluid properties

Official websites use. Share sensitive information only on official, secure websites. It nist fluid properties proven to be an extremely useful tool used by industry, government, and academia, and it is a primary method for the dissemination of work done by the Thermophysical Properties of Fluids Group, nist fluid properties. REFPROP is a computer program, distributed through the Standard Reference Data program of NIST, that provides thermophysical properties of pure fluids and mixtures over a wide range of fluid conditions including liquid, gas, and supercritical phases.

Official websites use. Share sensitive information only on official, secure websites. This program, developed by the National Institute of Standards and Technology NIST , calculates the thermodynamic and transport properties of industrially important fluids and their mixtures. These properties can be displayed in Tables and Plots through the graphical user interface; they are also accessible through spreadsheets or user-written applications accessing the REFPROP dll. 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. Mixture calculations employ a model that applies mixing rules to the Helmholtz energy of the mixture components; it uses a departure function to account for the departure from ideal mixing. Viscosity and thermal conductivity are modeled with either fluid-specific correlations, an ECS method, or in some cases the friction theory method.

Nist fluid properties

Regret for the inconvenience: we are taking measures to prevent fraudulent form submissions by extractors and page crawlers. Box , P. Received: May 20, Published: August 28, Citation: Marzouk OA. Thermo physical chemical properties of fluids using the free NIST chemistry web book database. Fluid Mech Res Int. DOI: Download PDF. Many engineers, students, teachers, academicians, scientists, and researchers need to know intensive thermal, physical, and chemical properties of a fluid at a certain equilibrium state as determined by temperature and pressure, for example. Such properties include the density, specific volume, viscosity, specific heat capacity, thermal conductivity, speed of sound, specific enthalpy, specific entropy, and surface tension. The database is available online free-of-charge and does not require registration for access. Its use is simple, and it offers the user multiple options for the unit to be used for each individual property. Comparisons with two sources support the correctness of the database. Fluids gases and liquids are encountered heavily in different specializations of engineering and science. Engineers and researchers may frequently need an easy access to a reliable and rich database of fluid properties at a wide range of conditions during their work.

Koutian, A. All temperatures are given on ITS except those for oxygen and helium, where the equations of state still use the IPTS temperature scale.

Official websites use. Share sensitive information only on official, secure websites. Author s Eric W. Abstract These tables give thermodynamic and transport properties of a variety of fluids, as generated from the equations of state presented in the references below. All extensive properties are given on a mass basis. Not all properties are included for every substance. The references should be consulted for information on the uncertainties and the reference states for E, H, and S.

Official websites use. Share sensitive information only on official, secure websites. Property measurements of the very highest accuracies are important for developing the thermodynamic and transport property models for working fluids and reference fluids. More than simply providing data for a high-accuracy equation for, say, a refrigerant, our work, in collaboration with our theoretical colleagues, advances fluid property theory in general. This is the concept of a reference fluid—extensive, high-accuracy data on key fluids allow the development of improved equations of state for the calculation of thermodynamic properties and transport property models. These reference fluid formulations characterize the behavior of broad ranges of chemically similar fluids; in this way data on propane, for example, are used to improve the property models for a broad range of hydrocarbons that have limited data. State-of-the art property measurements have been the hallmark of the Fluid Properties Group for more than four decades. Many of these measurements have been carried out on one-of-a-kind instruments developed at NIST.

Nist fluid properties

The resources presented on this website are part of the output from the NIST Cryogenic Technologies Group that existed as a group from to Some limited activities continue today. The activities are divided into four areas: Education. Publications and short courses about cryogenics and its applications for use by the public and professionals. Click on the About Cryogenics link for a brief definition of cryogenics and its uses. Click on the Publications link for more detailed information. Cryocooler Research. Cooling to cryogenic temperatures is often carried out by the use of cryocoolers. NIST has carried out theoretical and experimental research on improved refrigeration processes and technologies to achieve cryogenic temperatures more efficiently, more reliably, and more compactly. Click on the Cryocoolers link to learn more about cryocoolers.

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REFPROP contains fluids that can be used as propellants, and fluids that can be used to model the atmosphere on our neighboring planets. A duplicate entry in the isobar section indicates a phase transition liquid-vapor at that temperature; property values are then given for both phases. Btu lb m. All temperatures are given on ITS except those for oxygen and helium, where the equations of state still use the IPTS temperature scale. No inferences should be drawn on account of other sites being referenced, or not, from this page. Values are first given along the saturation line. The database is available online free-of-charge and does not require registration for access. Mixture calculations employ a model that applies mixing rules to the Helmholtz energy of the mixture components; it uses a departure function to account for the departure from ideal mixing. To judge the accuracy of the values in the NIST Chemistry WebBook, we compare selected values taken for the properties of water as taken from that database with those available in two other sources. VAXA Software. These properties can be displayed in Tables and Plots through the graphical user interface; they are also accessible through spreadsheets or user-written applications accessing the REFPROP dll. Publication Ethics. In teaching a course, the data in an appendix of a textbook might be sufficient to meet the need of the instructor and student. The phase can be determined by noting the sharp decrease in density between two successive temperature entries; all lines above this point refer to the liquid phase, and all lines below refer to the gas phase. Thermophysical Properties of Water.

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Engineers and researchers may frequently need an easy access to a reliable and rich database of fluid properties at a wide range of conditions during their work. REFPROP contains fluids that can be used as propellants, and fluids that can be used to model the atmosphere on our neighboring planets. Richardson, I. Data 61 7 : , Box , P. Standards:Reference data. In , version 9 updated the GERG model to GERG , increased the number of pure fluids to , and increased the number of fitted binary mixtures to Home National Institute Share sensitive information only on official, secure websites. National Institute of Standards and Technology. Received: May 20, Published: August 28, Viscosity and thermal conductivity are modeled with either fluid-specific correlations, an ECS method, or in some cases the friction theory method. Public: This dataset is intended for public access and use. Links to other websites are provided because they may have information that would be of interest to you. Created April 22, , Updated June 2,