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Physics

Thermodynamics

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Displaying 26 - 50 of 827

An Equation of State for the Thermodynamic Properties of Helium

August 10, 2023
Author(s)
Diego Ortiz Vega, Kenneth Hall, James Holste, Allan H. Harvey, Eric W. Lemmon
This report documents the equation of state for fluid helium implemented in Version 10 of NIST's REFPROP Standard Reference Database. The equation of state is expressed as the molar Helmholtz energy as a function of temperature and density, and is valid

Quantum Entropic Effects in the Liquid Viscosities of Hydrogen, Deuterium, and Neon

July 26, 2023
Author(s)
Ian Bell, Jacob Leachman, Albert Rigosi, Heather Hill
The extreme conditions have limited the availability and accuracy of experimental thermophys- ical property measurements for cryogens, particularly transport properties. Traditional scaling techniques such as corresponding states theory have long been

pH response of sequence-controlled polyampholyte brushes

May 31, 2023
Author(s)
Xin Yuan, Harold Hatch, Jacinta Conrad, Amanda Marciel, Jeremy Palmer
We use molecular simulation to investigate the pH response of sequence-controlled polyampholyte brushes (PABs) with polymer chains consisting of alternating blocks of weakly acidic and basic monomers. Changes in the ionization state, height, lateral

Reference materials for phase equilibrium studies. 2. Solid-liquid equilibria (IUPAC Technical Report)

January 11, 2023
Author(s)
Ala Bazyleva, William E. Acree, Vladimir Diky, Glenn T. Hefter, Johan Jacquemin, M. Clara F. Magalhaes, Joe W. Magee, Kirk Nordstrom, John O'Connell, James D. Olson, Ilya Polishuk, Kurt A. G. Schmidt, John M. Shaw, J. P. Martin Trusler, Ronald D. Weir
This article is the second of three projected IUPAC Technical Reports on reference materials for phase equilibrium studies. The goal of this project was to select reference systems with critically evaluated property values for the verification of

Entropy Scaling of Viscosity for Molecular Models of Molten Salts

January 9, 2023
Author(s)
Jeffrey Young, Ian Bell, Allan H. Harvey
Entropy scaling relates dynamic and thermodynamic properties by reducing the viscosity to be a function of only the residual entropy. Molecular simulations are used to investigate the entropy scaling of the viscosity of three models of sodium chloride and

Physics-based Models for photonic thermometers

December 1, 2022
Author(s)
Zeeshan Ahmed
Resistance thermometry, meticulously developed over the last century, provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches along with a desire to reduce the cost of sensor ownership

Role of Non-Temperature-Gradient Power Flow Terms in Low-Temperature Regenerators

December 1, 2022
Author(s)
Ryan Snodgrass, Joel Ullom, Scott Backhaus
The total power flow through cryocooler regenerators is key to their performance because it reduces the cooling available at the cold heat exchanger. At temperatures near 4 K, the real-fluid properties of helium and the finite-heat-capacity of regenerator