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Experimentally, if object A is in equilibrium with object B, and object B is in equilibrium with object C, then object A is in equilibrium with object C. That statement of transitivity is called the "zeroth law of thermodynamics." For example, a cold metal block and a hot metal block are both placed on a metal plate at room temperature. Eventually, the cold block and the plate will be in thermal equilibrium. In addition, the hot block and the plate will be in thermal equilibrium.
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The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
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In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic models, the...
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The Second Law of Thermodynamics states that entropy, or the amount of disorder in a system, increases each time energy is transferred or transformed. Each energy transfer results in a certain amount of energy that is lost—usually in the form of heat—that increases the disorder of the surroundings. This can also be demonstrated in a classic food web. Herbivores harvest chemical energy from plants and release heat and carbon dioxide into the environment. Carnivores harvest the...
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Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Teoría de Promediado Termodinámicamente Restringido: ¿Por Qué Molestarse?

Timothy M Weigand1, William G Gray1,2, Cass T Miller1

  • 1University of North Carolina, Chapel Hill.

ARC geophysical research
|December 30, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio simplifica la teoría de promediado termodinámicamente restringido (TCAT) para el flujo en medios porosos. Demuestra el poder de TCAT para derivar modelos precisos a macroescala, haciendo que los sistemas complejos sean más comprensibles para los investigadores.

Palabras clave:
Desarrollo de ModelosMedios PorososAmpliación de Escala

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Sus antecedentes:

  • Los modelos macroscópicos son esenciales para la investigación de medios porosos, pero a menudo carecen de una derivación rigurosa.
  • Los modelos fenomenológicos son comunes, pero la teoría de promediado termodinámicamente restringido (TCAT) ofrece un enfoque riguroso.
  • La complejidad de TCAT puede ser una barrera para su adopción generalizada en la investigación de medios porosos.

Conclusiones:

  • TCAT proporciona un marco robusto para derivar modelos macroscópicos precisos en medios porosos.
  • El estudio simplifica la aplicación de TCAT, haciendo que sus beneficios sean más evidentes para investigadores y profesionales.
  • TCAT ofrece un potencial significativo para avanzar en la comprensión y modelado de sistemas complejos de medios porosos.