Title: "The sound of singing corrugated pipes"
Authors: Gunnar K. Furnes and Guttorm Alendal

Abstract: When air flow passes through a corrugated pipe open at both
ends, it produces musical tones. With a smooth pipe, no sound is
produced. It is therefor likely that the sound production mechanism is
related to the scales of the corrugations while the scales of the pipe
may act as the resonator. A simple mathematical model for compressible
air flow through a corrugated pipe is presented, solved and compared
with experiments