有机液体非线性声参量及声速系数量级研究

The co-efficiency of ultrasound velocity and B/A parameters in organic liquid: a study

有机液体中声速的研究是获知有机液宏观热力学性质的一个有效方法 ,也是探索液体微观信息的重要手段 .仝杰等用分子硬球模型的VanderVaals方程对声速的温度、压力特性和非线性声参量B A作了定量计算的探讨 .本文用高链烷液体 (CnH2n + 2 )的前人数据 ,分析了作者基于自由体积理论提出的有机液体的声速温度系数、压力系数和非线性声参量B A公式 .对大多数有机液体B A值依赖于液体的微观结构 ,且在正常温度压力下 ,其B A值 >4,初步结果表明 ,理论与实验基本相符 .

The study of the velocity of sound in the organic liquid is one of the effective ways to acquire the nature of organic liquid macro-thermodynamics and one of the important means of approaching micro-information of liquids. Mr.Tong Jie has made an approach to the quantitative calculation of the temperature of the velocity of sound, pressure features and non-lineal sound parameter B/A through Van der Vaals Equation of molecular hard ball model. On the basis of the data of CnH2n+2 obtained by the former researchers, this essay advances the temperature coefficient of the velocity of sound of the organic liquids, pressure coefficient and the non-linear sound parameter B/A formula on the ground of theory of free volume. Most organic liquid B/A value depend on the micro structure of liquids. Under the normal temperature pressure, their B/A value is larger than 4. Therefore, the initial result evidences that theory checks with practice basically.