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Displaying 351 - 375 of 403

Properties of water and aqueous systems: Metrological applications

November 19, 2004

Author(s)

Daniel G. Friend, Allan H. Harvey

Water and aqueous systems are widely used in metrology, which is a major focus of the National Institute of Standards and Technology (NIST). Standards such as those produced by IAPWS can be used to calibrate instruments and validate protocols. In this work

Fluid Properties Simulation Challenge Recommendations for Problem II (b): Cyclohexane Density

March 11, 2004

Author(s)

Eric W. Lemmon

Recommendations are given for Problem 11(b): cyclohexane density at problem conditions: (1) 0.1 MPa, 300 K and (2) 20.0 NAPA, 400 K. The recommended values and their uncertainties are: 772.13 0.3 kg m-3 and 702.9 1.4 kg m-3.

Correlation for the Second Virial Coefficient of Water

March 4, 2004

Author(s)

Allan H. Harvey, Eric W. Lemmon

A new correlation has been developed to represent the second virial coefficient of water (H2O) as a function of temperature. The formulation was fitted to experimental data, both for the second virial coefficient itself and for a quantity related to its

Intermolecular Potential and Second Virial Coefficient of the Water-Hydrogen Complex

January 1, 2004

Author(s)

M P. Hodges, R J. Wheatley, G K. Schenter, Allan H. Harvey

We construct a rigid-body (5-dimensional) potential-energy surface for the water-hydrogen complex using scaled perturbation theory (SPT). An analytic fit of this surface is obtained, and using this, two minima are found: the global miniumum has C 2v

Salt solubility and deposition in high temperature and pressure aqueous solutions

January 1, 2004

Author(s)

M S. Hodes, K A. Smith, Wilbur S. Hurst, Walter J. Bowers Jr., P Griffith, K Sako

Solubility and deposition experiments were performed with aqueous sodium sulfate and potassium sulfate solutions at elevated temperatures and pressures typical of the Supercritical Water Oxidation (SCWO) process. For all experiments the test cell was the

The Refprop Database for the Thermophysical Properties of Refrigerants

September 14, 2003

Author(s)

Mark O. McLinden, Eric W. Lemmon, Marcia L. Huber

Property databases are widely used for the design and analysis of refrigeration systems. Version 7 of the NIST REFPROP Reference Fluid Thermodynamic and Transport Properties) database is described. Compared with previous versions, the database includes

ThermoML - An XML-Based Approach for Storage and Exchange of Experimental and Critically Evaluated Thermophysical and Thermochemical Property Data 2. Uncertainties

May 26, 2003

Author(s)

Robert D. Chirico, Michael D. Frenkel, Vladimir Diky, K N. Marsh, R C. Wilhoit

ThermoML is an XML-based approach for storage and exhange of experimental and critically evaluated thermophysical and thermochemical property data. Extensions to the ThermoML schema for the expression of uncertainties are described. Basic principles, scope

How Fluids Unmix: Discoveries by the School of Van Der Waals and Kamerlingh Onnes

August 31, 2002

Author(s)

Johanna Levelt Sengers

This book narrates the story of pioneering scientists in the Netherlands, who reached a profound and comprehensive understanding of fluid mixture phase separation within a brief time span around the turn of the 19th century. This achievement was the

Method for Estimating Mixture Equation of State Parameters

November 1, 2001

Author(s)

Eric W. Lemmon, Mark O. McLinden

A predictive method for estimating the zij parameter in the mixture model of Lemmon and Jacobsen [Int. J. Thermophysics 20:1629 (1999)] has been developed. Data for 76 binary pairs have been used in the development of this method, and these data are

Isochoric p-r-T Measurements on (x) CO 2 + (1-x) C 2 H 6 , xapproximately equal to} 0.25, 0.49, 0.74} From 200 to 400 K at Pressures to 35 Mpa

October 1, 2001

Author(s)

H Duarte, Joe W. Magee

The p-p-T relationships were measured for binary hydrocarbon mixtures containing carbon dioxide (CO 2) and ethane (C 2H 6). Temperatures ranged from 200 K to 400 K with pressures up to 35 MPa. Measurements of p-p-T were conducted on compressed gaseous and

Steam Tables

October 1, 2001

Author(s)

Allan Harvey

Cryogenic Material Properties Database

September 30, 2001

Author(s)

E D. Marquardt, J P. Le, Ray Radebaugh

Vapor Precooling in a Pulse Tube Liquefier

September 30, 2001

Author(s)

E D. Marquardt, Ray Radebaugh, Adele P. Peskin

Accurate Measurements of Thermodynamic and Transport Properties of Industrial Gases with Acoustic Resonators.

September 2, 2001

Author(s)

Keith A. Gillis, John J. Hurly, Michael R. Moldover

Acoustic resonators have been developed at NIST as tools to measure the thermodynamic and transport properties of gases. High Q cylindrical acoustic resonators are routinely used to measure the speed of sound in gases with uncertainties of 0.01% or less

Solubilities of Cerium(IV), Terbium(III), and Iron(III) b-Diketonates in Supercritical Carbon Dioxide

September 1, 2001

Author(s)

W C. Andersen, R E. Sievers, A F. Lagalante, Thomas J. Bruno

Solubility of Capsaicin and B-Carotene in Supercritical Carbon Dioxide and in Halocarbons

September 1, 2001

Author(s)

B N. Hansen, Allan H. Harvey, J P. Coelho, M F. Palavra, Thomas J. Bruno

We measured the solubilities of Β-carotene and capsaicin in supercritical carbon dioxide, and also in difluoromethane (R-32) and 1,1,1,2-tetrafluoroethane (R-134a) in the liquid phase at temperatures near and somewhat below their critical points. Β

The NIST Chemistry WebBook: A Chemical Data Resource on the Internet

September 1, 2001

Author(s)

Peter J. Linstrom, William G. Mallard

The NIST Chemistry WebBook (http://webbook.nist.gov) is an Internet site that provides access to chemical and physical property data both from NIST and other sources. The site was established in 1996 and has grown to encompass a wide variety of

An Asymptotic Expression for the Critical-Region Bird's Beak Isotherm and Adjacent Isotherms on the Vapor-Liquid Phase Diagram of a Simple Binary Mixture

July 1, 2001

Author(s)

James C. Rainwater

For a binary mixture of a dilute nonvolatile solute in a volatile solvent, an asymptotic expression is derived for isothermal dew-bubble curves in the region just above the solvent critical point. The expression depends only on the solvent coexistence

Fitting vapor pressure temperature data: simplicity and unintended consequences

July 1, 2001

Author(s)

Michael D. Frenkel, K. R. Hall, S M. Mannan, G A. Iglesias-Silva

Computational Study of the Reactions of Methane with XO Radicals (X = F, Cl, or Br): Implications in Combustion Chemistry

May 1, 2001

Author(s)

F Louis, Thomas C. Allison, Carlos A. Gonzalez, J P. Sawerysyn

Theoretical calculations were carried out on the H-atom abstraction reaction from methane by XO (X = F, Cl or Br) radicals attack. Geometry optimizations and vibrational frequency calculations were performed using three methods: Moller-Plesset second-order

Ab Initio Study of the Intermolecular Interactions in Small Benzene Clusters: The Equilibrium Structures of Trimer, Tetramer, and Pentamer

March 15, 2001

Author(s)

Carlos A. Gonzalez, E C. Lim

Isochoric Heat Capacity Measurements for Light and Heavy Water Near the Critical Point

January 1, 2001

Author(s)

N. G. Polikhronidi, Ilmutdin M. Abdulagatov, Joe W. Magee, G. V. Stepanov

Molar Heat Capacity Cv, Vapor Pressure, and (p, rho,T) Measurements From 92 to 350 K at Pressures to 35 Mpa and a New Equation of State for Chlorotrifluoromethane (R13)

January 1, 2001

Author(s)

Joe W. Magee, Stephanie L. Outcalt, James F. Ely

Measurements of the molar heat capacity at constant volume C v for chlorotrifluoromethane (R13) were conducted using an adiabatic method. Temperatures ranged from 95 to 338 K, and pressures were as high as 35 Mpa. Measurements of vapor pressure were made

TRC SOURCE Database: A Unique Tool for Automatic Production of Data Compilations

January 1, 2001

Author(s)

Michael D. Frenkel, Qian Dong, R C. Wilhoit, K. R. Hall

Window-Based Applications of TRC Databases: Structure and Internet Distribution

January 1, 2001

Author(s)

X. Yan, Qian Dong, Michael D. Frenkel, K. R. Hall

Thermophysical and thermochemical property data on organic compounds provide vital background information for scientific and engineering communities in both academic and industrial environments. The Thermodynamics Research Center (TRC) has collected an