Abstract
A corrugated tube open at both ends, with air flowing through the tube, sings notes which depend on the flow velocity and the length of the tube. The notes it sings are the natural harmonics of the tube. A given note will sing when the flow velocity is such that the “bump frequency” (frequency at which the air bumps into the corrugations) equals the frequency of the note, provided also that the flow velocity is sufficiently high to induce turbulent flow. For some tube diameters and corrugation lengths the critical minimum Reynolds number that I observe for singing agrees with the classical result Rmin = 2000 observed by Reynolds for turbulent flow in smooth tubes. For other lubes I observe singing at much smaller values of R. Three new musical instruments are described: the Water Pipe, the Gas-Pipe Corrugahorn Bugle, and the Gas-Pipe Blues Corrugahorn.
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