title: Acoustic intensity measurement in a narrow duct by a two-sensor method.
abstract: The use of two pressure sensors [Fusco et al., J. Acoust. Soc. Am. 91, 2229 (1992)] makes it possible to determine the acoustic intensity of a gas column in a duct, but the application of this method was limited to wide ducts. In this letter, the formulation of the method is modified to include narrow ducts where the duct radius is as small as the viscous boundary layer thickness of the gas. The validity of this method is shown by comparison with the direct measurements of the pressure and velocity.
authors.affiliation: Department of Mechanical Systems and Design, Tohoku University, Sendai, Japan.
authors.forename: Tetsushi
authors.initials: T
authors.lastname: Biwa
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Tashiro
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nomura
authors.forename: Yuki
authors.initials: Y
authors.lastname: Ueda
authors.forename: Taichi
authors.initials: T
authors.lastname: Yazaki
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D000465:Algorithms; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000737:chemistry*; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers
chemical_list: D005740:Gases