Disequilibrium condensation environments in space - A frontier in thermodynamics

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Aerospace Environments, Condensing, Cosmic Dust, Nonequilibrium Thermodynamics, Vapor Phases, Astrophysics, Gas Density, Gas Pressure, Gas Temperature, Steady State

Scientific paper

The thermal-disequilibrium aspect of the problem of dust-particle formation from a gas phase in an open space environment is discussed in an effort to draw attention to the space condensation environment as an interesting arena for application and extension of the ideas and formalisms of nonequilibrium thermodynamics. It is shown that quasi-steady states with a disequilibrium between the gas-phase kinetic temperature and the condensed-phase internal temperature appear to be the norm of condensation environments in space. Consideration of the case of condensation onto a bulk condensed phase indicates that these quasi-steady states may constitute Prigogine dissipative structures. It is suggested that a proper study of the process of condensation in a space environment should include any effects arising from thermal disequilibrium.

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