文献类型：期刊文献

中文题名：声弛豫过程影响下的气体平衡态热容合成方法及其在气体检测中的应用

英文题名：Acoustic method of synthesizing equilibrium heat capacities of excitable gases under influence of acoustic relaxation process and its application in gas detection

作者：张克声 张向群 邵芳

第一作者：张克声

通信作者：Zhang, Kesheng

机构：[1]贵州理工学院电气与信息工程学院,贵阳550003;[2]华中科技大学电子信息与通信学院,武汉430074;[3]贵州理工学院机械工程学院,贵阳550003

第一机构：贵州理工学院电气与信息工程学院

通信机构：School of Electrical and Information Engineering, Guizhou Institute of Technology, Guiyang, 550003, China|贵州理工学院电气与信息工程学院;贵州理工学院;

年份：2020

卷号：45

期号：3

起止页码：394-403

中文期刊名：声学学报

外文期刊名：Acta Acustica

收录：CSTPCD;;EI(收录号：20202508845081);Scopus(收录号：2-s2.0-85086441996);北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家自然科学基金项目(61461008,61571201,11764007,51465009);国家留学基金项目(201708525058);贵州省科学技术基金项目(黔科合J字[2015]2065);河南省高等学校重点科研项目计划(15A510037);贵州理工学院高层次人才引进项目(XJGC20140601)资助。

语种：中文

中文关键词：弛豫过程;吸收系数;气体分子;背景气体;摩尔分数;平衡态;混合气体;合成方法;气体检测

外文关键词：Acoustic wave absorption - Degrees of freedom (mechanics) - Gas absorption - Gases - Relativity - Relaxation processes - Sound insulating materials - Specific heat

摘要：声扰动形成的分子振动弛豫过程使得气体热容成为依赖于声频率的有效热容,导致随频率变化的声速频散和声弛豫吸收。本文基于单弛豫过程合成算法,提出一种基于两频点声速和声吸收测量值的气体平衡态热容合成方法。该方法两个测量声频点只需在声弛豫吸收显著的频率范围即可分别合成可激发气体分子内外自由度热容,并有效消除声弛豫过程对气体平衡态热容测量结果的影响。对于室温下由CO2、CH4、Cl2、N2和O2组成的多种气体,合成的气体热容值与基于Planck-Einstein公式的热力学理论计算结果相符,相比实验数据最大相对误差为3.51%。合成的转动和振动热容还可应用于气体分子几何结构、振动频率大小和混合气体摩尔分数的检测。
The molecular vibration relaxation process caused by the acoustic disturbance leads the heat capacity of excitable gas to the effective heat capacity that depends on the sound frequency,resulting in sound dispersion and sound relaxational absorption.Based on the algorithm of synthesizing a single-relaxation process,we develop a synthesizing method to get the equilibrium heat capacities of excitable gases from the two-frequency sound velocity and sound absorption measurements.The two measurement frequencies can be selected in the range where the sound relaxational absorption is obvious.The method can respectively obtain the heat capacities of internal and external degrees of freedom of gas molecules,and effectively eliminate the influence of the acoustic relaxation process on the measurement results of excitable gas heat capacity.For various gases,consisting of CO2,CH4,Cl2,N2 and O2 at room temperature,the gas heat capacities acquired by this paper are consistent with the thermodynamic theoretical calculations based on the Planck-Einstein formula,and the maximum relative error is 3.51% in comparison to the experimental data.The synthesized heat capacities of rotation and vibration can be applied to the detection of gas molecular geometry,vibration frequency and mole fractions of gas mixtures.