Decoupling multimode vibrational relaxations in multi-component gas mixtures: Analysis of sound relaxational absorption spectra

doi:10.1088/1674-1056/22/1/014305

Abstract 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.

Keywords: vibrational relaxation sound absorption vibrational-vibrational coupling decoupled single-relaxation process

Received: 27 July 2012
Revised: 06 September 2012
Accepted manuscript online:

PACS:	43.35.Ae	(Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in gases)
	43.35.Fj	(Ultrasonic relaxation processes in gases, liquids, and solids)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60971009 and 61001011), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20090142110019), the Natural Science Foundation of Hubei Province, China (Grant No. 2010CDB02701), and the Fundamental Research Funds for the Central Universities, China (Grant No. 2012QN083).

Corresponding Authors: Zhu Ming
E-mail: zhuming@mail.hust.edu.cn

Cite this article:

Zhang Ke-Sheng (张克声), Wang Shu (王殊), Zhu Ming (朱明), Ding Yi (丁毅), Hu Yi (胡轶) Decoupling multimode vibrational relaxations in multi-component gas mixtures: Analysis of sound relaxational absorption spectra 2013 Chin. Phys. B 22 014305

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Decoupling multimode vibrational relaxations in multi-component gas mixtures: Analysis of sound relaxational absorption spectra

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