Year: 2026
Type: preprint
Abstract: A thermodynamic theory for transport coefficients in hard-sphere fluids is developed from a general expression for the Onsager matrix. The theory predicts the ratio $σ/σ_{\rm id}$, where $σ$ is a transport coefficient and $σ_{\rm id}$ denotes its dilute-gas value. This ratio depends exclusively on equilibrium thermodynamic properties and can therefore be computed directly from the equation of state. Compact expressions are obtained for the thermal conductivity, viscosity, and self-diffusion coefficient. These expressions agree closely with simulation data at low and intermediate densities and remain useful across the fluid range, although deviations increase near freezing, particularly for viscosity. The self-diffusion prediction substantially improves upon Enskog theory. These results support a thermodynamic description of transport coefficients relative to their dilute-gas values.
Source: arXiv (Cornell University)
Author: Hoyuelos, Miguel
Language: English
Subfield: Physical and Theoretical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7201859080