Bridgman formula for the thermal conductivity of atomic and molecular liquids

Abstract

A simple and popular Bridgman's model predicts a linear correlation between the thermal conductivity coefficient and the sound velocity of dense liquids. A proportionality coefficient proposed originally is fixed and independent of the liquid molecular structure. This work reports a systematic analysis of correlations between thermal conductivity and sound velocity in simple model systems (hard sphere and Lennard-Jones fluids), monoatomic liquids (argon and krypton), diatomic liquids (nitrogen and oxygen), and several polyatomic liquids (water, carbon dioxide, methane, and ethane). It is demonstrated that linear correlations are well reproduced for model fluids as well as real monoatomic and diatomic liquids, but seem less convincing in polyatomic molecular liquids. The coefficient of proportionality is not fixed; it is about unity for monoatomic liquids and generally increases with molecular complexity. Some implications for the possibility to predict the thermal conductivity coefficients are discussed.

8 pages, 10 figures

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Cited by in corpus (4)

• Elementary vibrational model for transport properties of dense fluids
• Elementary vibrational model for thermal conductivity of Lennard-Jones fluids: Applicability domain and accuracy level
• Speed of sound in dense simple liquids
• Modified Bridgman formula for the thermal conductivity of complex (dusty) plasma fluids