Measurement of index of refraction for multicomponent fluid mixtures

扩散是用来描述一种物质相对于另一种物质运动的一般术语。各种原因可能产生这种相对运动。例如，组成的不均匀性可以导致等温分子扩散。扩散在许多工业过程中起着重要的作用，如流体分离、蒸馏、干燥和涂层过程、晶体生长、材料加工以及从焦油砂和深层储层中开采油气。精确的扩散实验对扩散主导工业过程的控制和优化具有重要意义。测量数据将与新开发的理论进行比较，以便更好地描述现有的地面应用扩散理论。

Diffusion is the general term used to describe the motion of one species with respect to the other. Various causes may produce this relative motion. For instance, the composition inhomogeneities can lead to isothermal molecular diffusion. Diffusion plays an important role in many industrial processes, such as fluid separation, distillation, drying and coating processes, crystal growth, material processing and oil and gas extraction from tar sand and deep reservoir. Accurate diffusion experiments are of great importance in the control and the optimization of diffusion-dominant industrial processes. The measured data will be compared with the newly developed theory in order to better characterize the existing diffusion theories for terrestrial application.