Quasi-thermodynamics of powders and granular dynamics

Literature Information

Publication Date 2004-09-08
DOI 10.1039/B407699K
Impact Factor 3.676
Authors

Radhika S. Saksena, Leslie V. Woodcock


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Abstract

Granular dynamics simulations of inelastic spheres thermalised by mechanical vibrations are reported. The objective is to determine the conditions whereby inelastic spheres in a gravitational force field can behave quasi-thermodynamically. Granular temperatures and granular pressures are defined by analogy with molecular thermodynamics. Quasi-thermodynamic property profiles are then investigated as a function of the system state variables, surface density, gravitational field, and the vibrational frequency and amplitude. A quasi-thermodynamic phase-behaviour of crystallisation equilibria, and also mixing and segregation phenomena in binary systems, are observed. Conditions for granular steady-states to obey laws of corresponding states with small inhomogeneous thermodynamics systems are obtained. The results for a binary system are consistent with the thermodynamic interpretation of recently discovered experimental phase behaviour of binary powders fluidised by acoustic vibrations. The results may be regarded as a step towards a more formal description of various “self-assembly” phenomena of granular colloids, as ordering transitions of quasi-thermodynamic small systems.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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