Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (1): 14305-014305.doi: 10.1088/1674-1056/22/1/014305
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
张克声, 王殊, 朱明, 丁毅, 胡轶
Zhang Ke-Sheng (张克声), Wang Shu (王殊), Zhu Ming (朱明), Ding Yi (丁毅), Hu Yi (胡轶)
摘要: Decoupling the complicated vibrational-vibrational (V-V) coupling of a multimode vibrational relaxation remains a challenge to analyze the sound relaxational absorption in multi-component gas mixtures. In our previous work [Acta Phys. Sin. 61 174301 (2012)], an analytical model to predict the sound absorption from vibrational relaxation in a gas medium is proposed. In this paper, we develop the model to decouple the V-V coupled energy to each vibrational-translational deexcitation path, and analyze how the multimode relaxations form the peaks of sound absorption spectra in gas mixtures. We prove that a multimode relaxation is the sum of its decoupled single-relaxation processes, and only the decoupled process with a significant isochoric-molar-heat can be observed as an absorption peak. The decoupling model clarifies the essential behind the peaks in spectra arising from the multimode relaxations in multi-component gas mixtures. The simulation validates the proposed decoupling model.
中图分类号: (Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in gases)