自由体积理论下液体声速、声速系数及非线性声参量B/A的研究

Study of the ultrasound velocity coefficient of sound velocity and nonlinear parameter B/A in organic liquid based on free volume theory

用液体自由体积理论研究了有机液体的声速、声速系数及非线性声参量与分子结构和分子势能的关系。结果表明分子间的作用力是影响声速、声速系数及非线性声参量的主要原因。同时非线性声参量Ｂ／Ａ也体现了液体分子结构方面的信息。本文有助于对自由体积理论下液体状态方程的进一步研究。为揭示声速及其相关特性与微观机制的关系并为其定量计算作了有益的探索。

In this article,based on the free volume theory,we discuss the relation between ultrasound velocity,coefficient of sound velocity,nonlinear parameter B/A and molecular structures,potential enegy in organic liquid.The results show that the intermolecular potential energy is the dominant factor which determines the value and character of ultrasound velocity in organis liquide,and B/A value can be used to predict liquid molecular structures.This article will help to study equation of state for liquid and reveal what information the B/A predicts at the molecular level.