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Chemistry

Thermochemical properties

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Displaying 551 - 575 of 781

Optimization Calculations for a 30 HZ, 4 K Regenerator with Helium-3 Working Fluid

June 28, 2009
Author(s)
Ray Radebaugh, Yonghua Huang, Agnes A. O'Gallagher, John M. Gary
The NIST numerical software, REGEN3.3, which incorporates both He-4 and He-3 properties, was used to calculate the losses and second law efficiencies of 4 K regenerators operating at 30 Hz. Operating parameters, such as average pressure, pressure ratio

Model for Thermodynamic Properties of a Biodiesel Fuel

June 12, 2009
Author(s)
Marcia L. Huber, Eric W. Lemmon, Andrei F. Kazakov, Lisa S. Ott, Thomas J. Bruno
We present an equation-of-state approach to modeling the thermodynamic properties of a biodiesel fuel. Preliminary Helmholtz-type equations of state were developed with limited experimental data for five fatty acid methyl esters (FAMEs) that are primary

New International Formulation for the Viscosity of H2O

April 21, 2009
Author(s)
Marcia L. Huber, Richard A. Perkins, Arno R. Laesecke, Daniel G. Friend, Jan V. Sengers, Marc J. Assael, Ifigenia N. Metaxa, Eckhard Vogel, Radim Mares, Kiyoshi Miyagawa
The International Association for the Properties of Water and Steam (IAPWS) encouraged an extensive research effort to update the IAPS Formulation 1985 for the Viscosity of Ordinary Water Substance, leading to the adoption of a Release on the IAPWS

Viscosity of H20 in the Critical Region

April 15, 2009
Author(s)
Jan V. Sengers, Richard A. Perkins, Marcia L. Huber, Daniel G. Friend
It has been well established that thermodynamic and transport properties of fluids exhibit singular behavior near the critical point. In this paper we review the theoretical predictions for the enhancement of the viscosity near the critical point. It is

Density and Speed of Sound Measurements of Jet A and S-8 Aviation Turbine Fuels

January 27, 2009
Author(s)
Stephanie L. Outcalt, Arno R. Laesecke, Malte B. Freund
The density and speed of sound were measured for three compositions of aviation jet fuel A, and a synthetic fuel (S-8) derived from the Fischer-Tropsch process. Measurements of density and speed of sound were carried out at ambient pressure (83 kPa) with a

TRC Thermodynamic Tables, Non-Hydrocarbon Supplement NH-100 (December 2008)

January 20, 2009
Author(s)
Michael D. Frenkel
1. Table 23-2-1-(1.10212)-db: Page db-5096.0 New table for 2-hexanol containing the density for the real fluid at selected temperatures and pressures. 2. Table 23-2-1-(1.16010)-db: Pages db-5852.0 and db-5852.1 New table for dimethyl carbonate containing

Supplemental backward equations T(pkh), v(p,h), and T(p,s), v(p,s) for the critical and supercritical regions (region 3) of the industrial formulation

January 7, 2009
Author(s)
H J. Kretzschmar, J R. Cooper, A Dittmann, Daniel G. Friend, J S. Gallagher, Allan H. Harvey, K Knobloch, Radim Mares, Kiyoshi Miyagawa, N Okita, I. Stocker, Wolfgang Wagner, I Weber
In modeling steam power cycles, thermodynamic properties as functions of the variables ( ), p h or ( ), p s are required in the critical and supercritical regions (region 3 of IAPWSIF97). It is difficult to perform these calculations with IAPWS-IF97
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