Widom delta of supercritical gas-liquid coexistence

Abstract

We report on the coexistence of liquid-like and gas-like structures in supercritical fluid (SCF). The deltoid coexistence region encloses the Widom line, and may therefore be termed the "Widom delta". Machine learning analysis of simulation data shows continuous transition across the delta, from liquid-like to gas-like states, with fractions following a simplified two-state model. This suggests a microscopic view of the SCF as a mixture of liquid-like and gas-like structures, where the anomalous behavior near the critical point originates from fluctuations between the two types.

References in corpus (3)

• Machine learning phases of matter
• Learning phase transitions by confusion
• Identifying structural flow defects in disordered solids using machine learning methods

Cited by in corpus (7)

• A corresponding-state framework for the structural transition of supercritical fluids across the Widom delta
• Universality, scaling and collapse in supercritical fluids
• "Two-phase" thermodynamics of the Frenkel line
• Topological Characterization of Rigid-Nonrigid Transition across the Frenkel Line
• Topological generalization of the rigid-nonrigid transition in soft-sphere and hard-sphere fluids
• Universal two-component dynamics in supercritical fluids
• Physical Signatures of Supercritical Fluid Boundaries