Acoustic attenuation in gas mixtures with nitrogen: experimental data and calculations.
Attenuation in a gas results from a combination of classical attenuation, attenuation from diffusion, and attenuation due to molecular relaxation. In previous papers [J. Acoust. Soc. Am. 109, 1955 (2001); 110, 2974 (2001)] a model is described that predicts the attenuation from vibrational relaxation in gas mixtures. In order to validate this model, the attenuation was measured using a pulse technique with four transducer pairs, each with a different resonant frequency. The attenuation calculated using the model was compared to the measured values for a variety of gases including: air, oxygen, methane, hydrogen, and mixtures of oxygen/nitrogen, methane/nitrogen, carbon dioxide/nitrogen, and hydrogen/nitrogen. After the measured data is corrected for diffraction, the model matches the trends in the measured attenuation spectrum for this extensive set of gas mixtures.
Ejakov
Sally G
SG
Center for Sensor Materials, Michigan State University, East Lansing, Michigan 48824-1116, USA. gaffsall@msu.edu
Phillips
Scott
S
Dain
Yefim
Y
Lueptow
Richard M
RM
Visser
Jacobus H
JH
D000162:Acoustics; D004784:Environmental Monitoring; D005740:Gases / Q000032:analysis* / Q000737:chemistry; D008956:Models, Chemical; D009584:Nitrogen / Q000032:analysis* / Q000737:chemistry; D014159:Transducers; D014732:Vibration
D005740:Gases; D009584:Nitrogen