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- W1676801447 abstract "The modeling of energy elastic effects in polymeric liquids is discussed. Since the conformational energy depends on local degrees of freedom, we advocate the use of a local structural variable in addition to the commonly employed conformation tensor. Using a toy model that is described by rotational isomeric states and vibrations around them, the benefit of the local structural variable is illustrated when calculating the generalized canonical partition function. In order to describe nonisothermal rheology, a thermodynamically admissible set of time evolution equations is derived for the microstructure in terms of the slow tensor variable and the fast scalar variable, with the following main results. First, the temperature‐like quantity appearing in the driving force for the heat flux can be directly related to the Lagrange multiplier of the energy in the generalized canonical partition function. Second, the driving forces for the structural relaxations are not given by the derivatives of the Helmholtz free energy density, but in general it is rather combinations of the derivatives of the energy and entropy densities that are relevant. And third, the exchange between local and conformational contributions to the energy, and entropy, respectively, are discussed." @default.
- W1676801447 created "2016-06-24" @default.
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- W1676801447 date "2008-01-01" @default.
- W1676801447 modified "2023-10-17" @default.
- W1676801447 title "Energy Elastic Effects in Flowing Polymeric Liquids, and the Concept of Nonequilibrium Temperature" @default.
- W1676801447 cites W2126066275 @default.
- W1676801447 doi "https://doi.org/10.1063/1.2964579" @default.
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