文献类型：期刊文献

英文题名：Calculating vibrational mode contributions to sound absorption in excitable gas mixtures by decomposing multi-relaxation absorption spectroscopy

作者：Zhang, Kesheng Ding, Yi Zhu, Ming Hu, Mingzhe Wang, Shu Xiao, Yingqun

第一作者：张克生;张克声

通信作者：Zhu, M[1]

机构：[1]Guizhou Inst Technol, Guizhou Key Lab Elect Power Big Data, Guiyang 550003, Guizhou, Peoples R China;[2]Guizhou Inst Technol, Sch Informat Engn, Guiyang 550003, Guizhou, Peoples R China;[3]Huazhong Univ Sci & Technol, Sch Elect Informat & Commun, Wuhan 430074, Hubei, Peoples R China;[4]Liupanshui Normal Univ, Dept Phys & Elect, Liupanshui 553004, Guizhou, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Huazhong Univ Sci & Technol, Sch Elect Informat & Commun, Wuhan 430074, Hubei, Peoples R China.

年份：2017

卷号：116

起止页码：195-204

外文期刊名：APPLIED ACOUSTICS

收录：;EI(收录号：20164002869612);Scopus(收录号：2-s2.0-84988948830);WOS:【SCI-EXPANDED(收录号:WOS:000388156400023)】；

基金：We are very grateful to Professor Richard M. Lueptow for helpful advices. This work is supported by the National Natural Science Foundation of China (Grant Nos. 61461008, 61371139, 61571201, 61540051 and 51567017), the National Science Foundation of Guizhou Province, China (Grant No. Qian Ke He J Zi [2015]2065), and the Recruitment Program of Guizhou Institute of Technology (Grant No. XJGC20140601).

语种：英文

外文关键词：Sound absorption; Molecular vibrational relaxation; Mode contributions; Decomposing multi-relaxation absorption spectra

摘要：Sound relaxational absorption spectroscopy of excitable gas mixtures is potentially applied for gas composition detection. The relaxation of vibrational modes of gas molecules determines the sound relaxational absorption. However, to our knowledge, the contribution of each vibrational mode available in gas mixtures to sound multi-relaxation absorption has not been calculated in existing literature. In this paper, based on the decoupled expression of the effective isochoric molar heat for a gas mixture, a sound multi-relaxation absorption spectrum is decomposed into the sum of single-relaxation spectra. From this decomposable characteristic, the contribution of each vibrational mode available in the gaseous medium to the multi-relaxation absorption is obtained at room temperature. For various gas compositions including carbon dioxide, methane, nitrogen etc., the calculated contributions of vibrational modes are verified by the comparison with experiment data. We prove the following views with quantifiable outcomes that the primary molecular relaxation process associated with the lowest mode plays the major role in acoustic relaxational absorption of gas mixtures; the mode with lower vibrational frequency provides higher contribution to the primary relaxation process. This work could provide a deeper insight into the relationship between the sound relaxational absorption spectroscopy and gas molecules. (C) 2016 Elsevier Ltd. All rights reserved.