文献类型：期刊文献

英文题名：Capturing molecular multimode relaxation processes in excitable gases based on decomposition of acoustic relaxation spectra

作者：Zhu, Ming Liu, Tingting Wang, Shu Zhang, Kesheng

第一作者：Zhu, Ming

通信作者：Zhu, M[1]

机构：[1]Huazhong Univ Sci & Technol, Sch Elect Informat & Commun, Wuhan 430074, Hubei, Peoples R China;[2]Guizhou Inst Technol, Sch Informat Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：Huazhong Univ Sci & Technol, Sch Elect Informat & Commun, Wuhan 430074, Hubei, Peoples R China

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：28

期号：8

外文期刊名：MEASUREMENT SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20173003980101);Scopus(收录号：2-s2.0-85025445748);WOS:【SCI-EXPANDED(收录号:WOS:000405666400003)】；

基金：This work was supported by the National Natural Science Foundation of China (grant nos 61371139, 61571201 and 61461008) and the Natural Science Foundation of Hunan Province of China (grant no. 14JJ6046). We thank Professor Richard M Lueptow for helpful discussion.

语种：英文

外文关键词：measurement of molecular relaxation; multimode relaxation in gases; acoustic relaxation spectra; relaxation time; relaxation strength

摘要：Existing two-frequency reconstructive methods can only capture primary (single) molecular relaxation processes in excitable gases. In this paper, we present a reconstructive method based on the novel decomposition of frequency-dependent acoustic relaxation spectra to capture the entire molecular multimode relaxation process. This decomposition of acoustic relaxation spectra is developed from the frequency-dependent effective specific heat, indicating that a multi-relaxation process is the sum of the interior single-relaxation processes. Based on this decomposition, we can reconstruct the entire multi-relaxation process by capturing the relaxation times and relaxation strengths of N interior single-relaxation processes, using the measurements of acoustic absorption and sound speed at 2N frequencies. Experimental data for the gas mixtures CO2-N-2 and CO2-O-2 validate our decomposition and reconstruction approach.