Acoustic Wave Attenuation Characteristics of Particle-laden Dissipative Media in Furnaces
To investigate the attenuation mechanism of audible acoustic waves by particle-laden dissipative media,the acoustic attenuation equations with different boundary layer thicknesses were derived by compa-ring the boundary layer thickness with the particle radius when the furnace of utility boiler was considered as the research subject.Numerical analysis was performed according to the boundary layer theory.The variation of acoustic attenuation coefficient with particle volume fraction,acoustic frequency,particle size,flue gas temperature,and flue gas density was elucidated under different boundary layer thicknesses.Re-sults show that the acoustic attenuation within the thin boundary layers is primarily attributed to the ab-sorption and scattering attenuation of the flue gas medium,whereas the acoustic attenuation within the medium and thick boundary layers is predominantly due to energy dissipation in the boundary layer of par-ticulate medium surface.The acoustic attenuation coefficient is positively correlated with particle volume fraction,acoustic frequency,and flue gas temperature,but inversely correlated with flue gas density,which provides a theoretical foundation for the real-time monitoring of dust concentration.
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