Thermodynamic Bounds on Constant-Volume Heat Capacities and Adiabatic Compressibilities

1968 ◽  
Vol 170 (1) ◽  
pp. 249-256 ◽  
Author(s):  
John C. Wheeler ◽  
Robert B. Griffiths
Keyword(s):  
Heat Capacities ◽  
Constant Volume ◽  
Volume Heat

scholarly journals The constant-volume heat capacities of gaseous perfluorocyclobutane and propylene

AIChE Journal ◽  
1960 ◽  
Vol 6 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Noel De Nevers ◽  
Joseph J. Martin
Keyword(s):  
Heat Capacities ◽  
Constant Volume ◽  
Volume Heat

Thermal expansion and heat capacities of AgBr and AgCl at solid and liquid phases from molecular dynamics simulation

2015 ◽  
Vol 29 (14) ◽  
pp. 1550091 ◽  
Author(s):  
Ü. Akdere
Keyword(s):  
Molecular Dynamics ◽  
Thermal Expansion ◽  
Molecular Dynamics Simulation ◽  
Silver Chloride ◽  
Linear Thermal Expansion ◽  
Anomalous Behavior ◽  
Heat Capacities ◽  
Constant Volume ◽  
Dynamics Simulation ◽  
Liquid Phases

Classical molecular dynamics simulation calculations of silver bromide, AgBr, and silver chloride, AgCl. in constant volume–energy (NVE) and constant pressure–temperature (NPT) ensembles have been performed. The temperature dependence of linear thermal expansion and molar heat capacities at constant volume and pressure have been presented at solid and liquid phases. The anomalous behavior of these properties about 200 K below the melting temperatures has been analyzed within the frame of the onset of the transition to the superionic phase.

scholarly journals The Travelling Cascade, Constant Volume Heat Exchanger in a Gas Turbine Lead Combined Cycle

1996 ◽  
Author(s):  
Demos P. Georgiou
Keyword(s):  
Heat Exchanger ◽  
Gas Turbine ◽  
Atmospheric Pressure ◽  
Combined Cycle ◽  
Constant Volume ◽  
Free Wall ◽  
Driven Cavity ◽  
Volume Heat ◽  
Pressure Changes ◽  
Thermodynamic Processes

When a gas enclosed in a cavity is heated or cooled, its pressure changes with its temperature as well. If a set of two countermoving “driven” cavity cascades employs the same free wall, then the system will operate as a countercurrent heat exchanger. At the exit points of the heat exchanger the two gases can be brought back to their original (atmospheric) pressure by isentropic processes thus producing useful work. The entire set of thermodynamic processes forms a double Lenoir cycle. The exhausts from the two Lenoir cycles may drive two more sets of corresponding cycles, thus allowing for the cascading of the process, until the added useful work becomes insignificant. When this idea is employed as a bottoming cycle in a Gas Turbine lead Combined cycle, employing four sets of Lenoir cycles, the achievable total thermal efficiencies rise to the 75 to 82 % level, athough the amount of heat transferred in all these processes is about 50 % more than that in a modern Brayton-Rankine combined cycle.

The First Law of Thermodynamics

2018 ◽  
Author(s):  
Dennis Sherwood ◽  
Paul Dalby
Keyword(s):  
Internal Energy ◽  
Heat Capacities ◽  
Dissipative Process ◽  
Constant Volume ◽  
Irreversible Processes ◽  
State Function ◽  
Thermodynamic Cycles ◽  
First Law Of Thermodynamics

The First Law of Thermodynamics, and how the First Law relates a change in a state function, internal energy, to changes in the path functions work and heat. Thermodynamic cycles. Heat capacities at constant volume, and the definition CV = (∂U/∂T)V. Mathematics of internal energy. Examples of the application of the First Law to isothermal, isobaric, isochoric and adiabatic changes. Reversible and irreversible paths. Mixing and friction as irreversible processes. Proof that that any path involving friction (or any other dissipative process) must be irreversible, implying that all real paths are irreversible.

Verification of the calculation of the constant-volume heat capacity difference of substances in the liquid and gas phases from the temperature dependence of heat of vaporization

1983 ◽  
Vol 48 (8) ◽  
pp. 2141-2146
Author(s):  
Věra Uchytilová ◽  
Václav Svoboda
Keyword(s):  
Heat Capacity ◽  
Temperature Dependence ◽  
Constant Volume ◽  
Heat Of Vaporization ◽  
Gas Phases ◽  
Volume Heat ◽  
Pure Substances ◽  
The Difference ◽  
Heats Of Vaporization ◽  
The Ideal

The possibilities were verified of the proposed method for calculating the difference between constant-volume heat capacities of liquids and gases in the ideal state from known data on the volumetric behaviour and temperature dependence of heats of vaporization of pure substances.

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