In a recent paper [J. Acoust. Soc. Am. 36, 2323–2327 (1964)], P. D. Richardson presents experimental data on the heat transfer from and boundary‐lager flow near a heated horizontal cylinder in the presence of horizontal, transverse, stationary sound fields. On the basis of these data, Richardson concludes that the so‐called “critical” sound‐pressure level may be important in engineering applications but has no intrinsic fluid‐mechanical significance. The present commentary reevaluates Richardson's contribution in the light of previously published work on this subject. It is shown, in particular, that, although Richardson's data—all of which were taken at subcritical sound‐pressure levels—cannot be used to draw firm conclusions concerning the existence of a critical sound‐pressure level, these data tend to confirm—rather than refute—the previously demonstrated fluid‐mechanical significance of the critical sound‐pressure level.

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