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The notion of energy through multiple scales: From a molecular level to fluid flows and beyond

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  • Asinari, Pietro
  • Chiavazzo, Eliodoro

Abstract

In the present paper, we review the consistent definition of macroscopic total energy in classical fluid mechanics, as a function of the microscopic canonical Hamiltonian field, based on a Lennard-Jones model with some spatially varying external field. The macroscopic total energy (sum of mechanical and internal energy) is proved to be equal to the equilibrium ensemble-averaged Hamiltonian. In particular, the conditions for including the effects of the external field both in the macroscopic potential energy and in the internal energy are discussed. We present the notion of energy as defined in different scientific communities, starting from the standard macroscopic systems all the way down to small ones, which are gaining an increasing popularity.

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  • Asinari, Pietro & Chiavazzo, Eliodoro, 2014. "The notion of energy through multiple scales: From a molecular level to fluid flows and beyond," Energy, Elsevier, vol. 68(C), pages 870-876.
    • Handle: RePEc:eee:energy:v:68:y:2014:i:c:p:870-876
    DOI: 10.1016/j.energy.2014.02.016
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    References listed on IDEAS

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    2. Perdomo, Felipe A. & Millán, Beatriz M. & Aragón, José L., 2014. "Predicting the physical–chemical properties of biodiesel fuels assessing the molecular structure with the SAFT−γ group contribution approach," Energy, Elsevier, vol. 72(C), pages 274-290.

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