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Physics

Thermodynamics

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Displaying 226 - 250 of 444

Relation Between Pore Size and the Compressibility of a Confi ned Fluid

November 18, 2015
Author(s)
Daniel W. Siderius, Vincent K. Shen, William P. Krekelberg, Gennady Y. Gor, Christopher J. Rasmussen, Noam Bernstein
When a fluid is conned to a nanopore, its thermodynamic properties differ from the properties of a bulk fluid. Measuring certain properties of con fined fluid can provide information about the pore sizes. Here we report a simple relation between the pore

Thermodynamic Properties of 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone: Vapor Pressure, (p, ?, T) Behavior, and Speed of Sound Measurements, and Equation of State

September 30, 2015
Author(s)
Mark O. McLinden, Richard A. Perkins, Eric W. Lemmon, Tara J. Fortin
We report comprehensive thermodynamic property measurements of 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone. The p–ρ–T behavior was measured from T = (225 to 470) K with pressures up to 36 MPa using a two-sinker densimeter. These

MEASURING PRESSURE AND VACUUM WITH LIGHT: A NEW PHOTONIC, QUANTUM-BASED, PRESSURE STANDARD

September 3, 2015
Author(s)
Jay H. Hendricks, Jacob E. Ricker, Jack A. Stone Jr., Patrick F. Egan, Gregory E. Scace, Gregory F. Strouse, Douglas A. Olson, Donavon Gerty
The future of pressure and vacuum measurement will rely on lasers and Fabry-Perot optical cavities, and will be based on fundamental physics of light interacting with a gas. Light interacts at the quantum level with matter such that light travels at a

Molecular-Based Virial Coefficients of CO2-H2O Mixtures

August 7, 2015
Author(s)
Allan H. Harvey, Andrew J. Schultz, David A. Kofke
We report values of the second and third virial coefficients for the system CO2-H2O, calculated as a function of temperature via numerical evaluation of cluster integrals that define the coefficients in terms of the intermolecular potential energy

Comprehensive Study of the Thermodynamic Properties for 2-Methyl-3-buten-2-ol

July 29, 2015
Author(s)
Dzmitry H. Zaitsau, Eugene Paulechka, Dzmitry S. Firaha, Andrey V. Blokhin, Gennady J. Kabo, Ala Bazyleva, Andrey G. Kabo, Mikhail A. Varfolomeev, Viktor M. Sevruk
The heat capacity of 2-methyl-3-buten-2-ol over the interval (5 to 370) K was measured in an adiabatic calorimeter. The standard entropy and heat capacity of liquid phase at reference temperature 298.15 K were found to be Som = (232.6 ± 1.0) J·K-1·mol-1

A Chemical Kinetic Mechanism for 2-Bromo-3,3,3-trifluoropropene (2-BTP) Flame Inhibition

July 22, 2015
Author(s)
Donald R. Burgess Jr., Valeri I. Babushok, Gregory T. Linteris, Jeffrey A. Manion
The present paper is concerned with the development of a detailed chemical kinetic mechanism to describe the flame inhibition chemistry of the fire suppressant 2-bromo-3,3,3-trifluoropropene (2-BTP). Currently 2-BTP is considered as a fire suppressant to

Computational Study of Trimer Self-Assembly and Fluid Phase Behavior

April 24, 2015
Author(s)
Harold W. Hatch, Vincent K. Shen, Jeetain Mittal
The fluid phase diagram of trimer particles composed of one central attractive bead and two repulsive beads was determined as a function of simple geometric parameters using flat-histogram Monte Carlo methods. A variety of self-assembled structures were

A Fundamental Equation of State for 1,1,1,3,3-Pentafluoropropane (R-245fa)

March 26, 2015
Author(s)
Ryo Akasaka, Yong Zhou, Eric Lemmon
A new fundamental equation of state explicit in the Helmholtz energy is presented for 1,1,1,3,3 pentafluoropropane (R 245fa), based on recent experimental data for the vapor pressures, densities, and vapor sound speeds. The functional form now uses

"Weighing" a Gas With Microwave and Acoustic Resonances

March 24, 2015
Author(s)
Keith A. Gillis, James B. Mehl, James W. Schmidt, Michael R. Moldover
With calibrations of large flow meters in mind, we established the feasibility of determining the mass Mof argon gas contained within a 0.3 m 3 commercially manufactured pressure vessel ("tank") with a relative uncertainty of u r(M) = 0.0015 at 0.6 MPa by

ThermoData Engine (TDE) Version 9.0 (Pure Compounds, Binary Mixtures, Ternary Mixtures, and Chemical Reactions); NIST Standard Reference Database 103b

December 31, 2014
Author(s)
Michael D. Frenkel, Robert D. Chirico, Vladimir Diky, Kenneth Kroenlein, Chris Muzny, Andrei F. Kazakov, Joe W. Magee, Ilmutdin M. Abdulagatov, Eric Lemmon, Jeongwon Kang
The ThermoData Engine is a software expert systems implementing the concept of dynamic data evaluation. This new release includes implementation of three important new features: (1)new parameters for the NIST "modified UNIFAC" method for predictions of

An Equation of State for the Thermodynamic Properties of Cyclohexane

December 5, 2014
Author(s)
Yong Zhou, Jun Liu, Steven Penoncello, Eric Lemmon
In this work, an equation of state for cyclohexane has been developed using the Helmholtz energy as the fundamental property with independent variables of density and temperature. Multi-property fitting technology was used to fit the equation of state that

A thermodynamic investigation of the cellulose allomorphs: cellulose(am), cellulose I?(cr), cellulose II(cr), and cellulose III(cr)

November 11, 2014
Author(s)
Robert N. Goldberg, Jacob Schliesser, Ashutosh Mittal, Stephen R. Decker, Ana Filipa L. Santos, Vera L. Freitas, Aaron A. Urbas, Brian E. Lang, Christian Heisse, Maria D. Ribeiro da Silva, Brian F. Woodfield, Rui Katahira, Wei Wang, David K. Johnson
The thermochemistry of samples of amorphous cellulose, cellulose I, cellulose II, and cellulose III was studied by using oxygen bomb calorimetry, solution calorimetry in which the solvent was cadoxen, and with a Physical Property Measurement System (PPMS)

Modeling RP-1 fuel advanced distillation data using comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry and partial least squares analysis

October 15, 2014
Author(s)
Thomas J. Bruno, Benjamin Kehimkar, Brendon Parsons, Jamin C. Hoggard, M. C. Billingsley, R. E. Synovec
Recent efforts in predicting rocket propulsion (RP-1) fuel performance through modeling put greater emphasis on obtaining detailed and accurate fuel properties, as well as to elucidate the relationships between fuel composition and their properties. Herein
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