Comment on Sound Dispersion in Single-Component System

TL;DR

This paper comments on prior work analyzing sound wave propagation in monatomic gases, highlighting issues with the application of local kinetic methods in certain regimes.

Contribution

It provides critical analysis of the methods used in the original study, questioning their applicability in the intermediate Knudsen number region.

Findings

Questions the validity of local kinetic descriptions in certain regimes

Highlights potential limitations of previous analytical methods

Suggests need for alternative approaches in sound dispersion analysis

Abstract

This paper was initiated by publication of Ref. [1] and can be considered as Comments on Ref. [1]. Authors of Ref. [1] investigate analytically the propagation of sound waves in one component monatomic gas (especially for the intermediate Knudses number region) using methods of local kinetic description in area where they are not applied in principal. [1] Napier D.G., Shizgal B.D. Sound Dispersion in Single-Component Systems. Physica A 387, 4099--4118 (2008)