气体在矿物油中扩散现象的可视化研究

介绍了利用马赫-泽德干涉仪法实现气体-矿物油扩散过程的可视化测量的原理、作用与意义。由于运用马赫-泽德干涉仪法获得的图像干涉条纹数及其图像的形状变化与折射率n直接与液体介质折射率相关,用马赫-泽德干涉仪法可获得十分清晰的影像。在N2,O2-矿物油扩散过程中,干涉条纹式样并未发生显著的紊乱变化,表明N2与O2气体在矿物油中发生扩散后,所引起的矿物油折射率变化过程较为缓慢。在CO2-矿物油扩散过程中,由于溶解的作用,矿物油近表面层中的气体溶解度增加,导致自然对流的出现。通过可视化测量,成功地观测到这一重要实验现象。同时,利用可视化技术,还可很好地判明对流出现的时间,从而确保扩散研究的有效性。

Visualized Experimental Observation to Diffusion of Gas Into Mineral Oil

The principle and function of visualized experimental observation to diffusion of gas into mineral oil using Mach-Zehnder interferometer method have been introduced. Clear photos of interference stripe taken by using Mach-Zehnder interferometer method were obtained since the blackness of photos is determined directly by refractive index of liquid. In the observation to diffusion of N_2 and O_2 into mineral oil, the case of obvious disordered motion in the interference stripe was not brought out, which means that diffusion of N_2 and O_2 into mineral oil only caused a relatively slow change of refractive index of mineral oil. In contrast, in the process of diffusion of CO_2 into mineral oil, natural convection is resulted from increase of solution density of CO_2 in the near surface layer of mineral oil, which has been successfully visualized. Also, the moment when convection occurs can be determined as to insure the validity of study of diffusion.