Intrinsic Bulk Viscosity in Monatomic and Diatomic Gases

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Abstract
The Born-Green theory, employing the Kirkwood superposition approximation, is investigated as a means of calculating the intrinsic bulk viscosity—a bulk viscosity due solely to Van der Waals interactions—in a monatomic gas. In the framework of the Born-Green Theory, it is found that the Kirkwood approximation does not introduce irreversibility and leads to homogeneous integral equations with no normalizing conditions. By the neglect of terms of the order of contributions from triple collisions, expressions for the bulk viscosity are derived in terms of other thermodynamic quantities which yield rough values of the order of one micropoise for argon and nitrogen at 0°C, 1 atmos.

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