Sound Attenuation and Its Relationship with interfacial Area Density in an Air/Water Two-Phase Bubbly Flow

[[abstract]]A simple model is developed for predicting the dispersion and attenuation of sound in a homogeneous low void fraction air-water two-phase bubbly flow. The relationship between interfacial area density and sound attenuation is derived for dimensionless frequency, Ω(=ωR02/α1) in the range 2000-8000. The interfacial area density is shown to be proportional to the square of the sound attenuation. Measurements of sound attenuation are performed for standing waves in a vertical waveguide containing an air-water bubbly mixture. The model of sound attenuation is compared with present and previous experimental data, and with previous theories. The interfacial area density predicted by the present model is compared with experimental data; the range of void fraction being 0.5-10% and the range of bubble radius being 0.6-2.2 mm[[fileno]]2060102010020[[department]]工程與系統科學