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Thermodynamics—Fundamentals

  • Kolumban HutterEmail author
  • Yongqi Wang
Chapter
Part of the Advances in Geophysical and Environmental Mechanics and Mathematics book series (AGEM)

Abstract

This chapter is devoted to thermodynamics; first, fundamentals are attacked and, second, a field formulation is presented and explored. Class experience has taught us that thermodynamic fundamentals are difficult to understand for novel readers. Utmost caution is therefore exercised to precisely introduce terminology such as ‘states’, ‘processes’, ‘extensive’, ‘intensive’ and ‘molar state variables’ as well as concepts like ‘adiabatic’, and ‘diathermic walls’, ‘empirical’ and ‘absolute temperature’, ‘equations of state’ and ‘reversible’ and ‘irreversible processes’. The core of this chapter is, however, the presentation of the first and second law of thermodynamics. The first law balances the energies. It states that the time rate of change of the kinetic plus internal energies are balanced by the mechanical power of the stresses and the body forces plus the thermal analogies, which are the flux of heat through the boundary plus the specific radiation referred to as energy supply. This conservation law then leads to the definitions of the caloric equations of state and the definitions of specific heats. The Second Law of Thermodynamics is likely the most difficult to understand and it is introduced here as a balance law for the entropy and states that all physical processes are irreversible. We motivate this law by going from easy and simple systems to more complex systems by generalization and culminate in this tour with the Second Law as the statement that entropy production rate cannot be negative. Examples illustrate the implications in simple physical systems and show where the two variants of entropy principles may lead to different answers.

Keywords

Reversible/irreversible processes Empirical/absolute temperature First, second law of thermodynamics Thermodynamic states—processes Extensive, intensive, molar state variables Adiabatic/non-adiabatic systems Diathermic wall Thermal equations of state vanderWaals gas Caloric equation of state Specific heats 

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.c/o Versuchsanstalt für Wasserbau, Hydrologie und GlaziologieETH ZürichZürichSwitzerland
  2. 2.Department of Mechanical EngineeringTechnische Universität DarmstadtDarmstadtGermany

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