激光全息干涉法测量液相扩散系数

Measurement Techniques of Liquid Molecular Diffusivity by Holographic Interferometry

在传递现象的研究中 ,全息干涉技术已被公认为一种最直观有效的方法。由于其具有精度及灵敏度高 ,信息量大 ,无干扰 ,可进行瞬态测量和整场观察等优点 ,已被广泛应用于流场中诸如速度 ,温度 ,浓度和密度等许多物性参数的定性或定量测量。液相分子扩散系数是描述质量传递的最重要的物性参数之一 ,由于缺乏精确的理论预测方法 ,迫切需要开发一种精密测试技术以满足实际应用和理论验证的需要。为此 ,激光全息方法受到了广泛重视。本文介绍了激光全息干涉技术及其在液相扩散系数测定中的应用进展 ,并进行了评述。

Holographic interferometer has become a generally accepted and the most effective method today in the study of transport phenomena, it has been widely applied to precise qualitative and quantitative measurement of various physical parameters in fluids such as velocity, temperature, concentration and density etc. with the advantages of high sensitivity and accuracy, large capacity of information, noninstrutive and feasible to make instantaneous measurement and visualization in overall insight into the whole process. The molecular diffusivity in liquid phase is one of the most important dynamical parameter for describing mass transfer. Due to the lack of satisfactory theoretical model to predict liquid diffusivity, it necessitates to exploit a novel and accurate experimental technique in order to meet the need of practical utilization and validate theory. Thus the holographic interference method has been paid much attention in the field. In this paper, the research progresses of holographic interferometer and its applications to determine liquid diffusivity are introduced and reviewed.