Particle fluctuations within sub-regions of an N-particle, three-dimensional fluid: Finite-size effects and compressibility

J.J. Salacuse

Physica A: Statistical Mechanics and its Applications, 2008, vol. 387, issue 13, 3073-3083

Abstract: We derive an expression which relates fluctuations in particle number, in the thermodynamic limit with fluctuations within a sub-region of an N-particle, three-dimensional, simple fluid. The accuracy of our result is tested against simulation results for a three-dimensional, hard-sphere fluid at a low, moderate, and high density state and we find agreement within the uncertainties of the simulation when restrictions associated with the result are enforced. Also, we demonstrate that the bulk isothermal compressibility can be accurately determined directly from fluctuation data obtained from simulations. Our expression yields a quantitative description of the (explicit) size effects associated with fluctuations within sub-regions of an N-particle system. The approach used in this paper is an extension of the approach used in a previous paper [J.J. Salacuse, Physica A 379 (2007) 372] associated with two-dimensional fluid systems.

Keywords: Finite-size effects; Fluctuations in particle number; Compressibility (search for similar items in EconPapers)
Date: 2008
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:387:y:2008:i:13:p:3073-3083

DOI: 10.1016/j.physa.2008.01.094

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