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arXiv · 1806.07608

"Two-phase" thermodynamics of the Frenkel line

Tae Jun Yoon·Min Young Ha·Won Bo Lee·Youn-Woo Lee
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Abstract

The Frenkel line, a crossover line between rigid and nonrigid dynamics of fluid particles, has recently been the subject of intense debate regarding its relevance as a partitioning line of supercritical phase, where the main criticism comes from the theoretical treatment of collective particle dynamics. From an independent point of view, this Letter suggests that the two-phase thermodynamics model may alleviate this contentious situation. The model offers new criteria for defining the Frenkel line in the supercritical region and builds a robust connection among the preexisting, seemingly inconsistent definitions. In addition, one of the dynamic criteria locates the rigid-nonrigid transition of the soft-sphere and the hard-sphere models. Hence, we suggest the Frenkel line be considered as a dynamic rigid-nonrigid fluid boundary, without any relation to gas-liquid transition. These findings provide an integrative viewpoint combining fragmentized definitions of the Frenkel line, allowing future studies to be carried out in a more reliable manner.

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Tae Jun Yoon, Min Young Ha, Won Bo Lee, Youn-Woo Lee. 2018-06-20. "Two-phase" thermodynamics of the Frenkel line. https://doi.org/10.1021/acs.jpclett.8b01955

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