Wall losses in straight ducts with non-circular cross sections: a scaling rule of identical losses for wooden flue organ pipes

Topical Issue - Musical Acoustics: Latest Advances in Analytical, Numerical and Experimental Methods Tackling Complex Phenomena in Musical Instruments

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Comparison of theoretical and simulated wall loss coefficients α relative to the cylindrical case α₀ for different cross section shapes. Nondimensional frequency: k₀R = 0.25. The highlighted black markers correspond to the circle, square, and equilateral triangle cross sections.

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