Measurement of Diffusion Coefficients of Air in Silicone Oil and in Hydraulic Oil  

作　　者：丁川 范毓润 

机构地区：[1]State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China

出　　处：《Chinese Journal of Chemical Engineering》2011年第2期205-211,共7页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （50675202）

摘　　要：A piston-cylinder apparatus was established to measure the solubility and diffusivity of air in dimethyl silicone oils and in hydraulic oils based on the PVT state equation of air and the solution of unsteady one-dimensional diffusion equation.The measured diffusivity-temperature relation can be well fitted by the Arrhenius equation for engineering applications.The correlation between the solute diffusivity D and solvent viscosity μ is examined.In terms of Eyring＇s activation theory,the activation in the air-silicone-oil diffusion process is quite different from that in the momentum transport of the silicone oil：the activation entropy of the former is positive while that of latter is negative.However,the activation enthalpies of the two processes are in the same order of magnitude,which leads to the observation that Dμ/T is roughly constant.一台活塞柱体仪器被建立基于空气和不稳定的一个维的散开方程的答案的 PVT 州的方程在 dimethyl 硅酮油并且在水力的油测量空气的溶解度和扩散性。测量扩散性温度关系能被 Arrhenius 方程很好为设计应用适合。在溶质扩散性 D 和溶剂粘性之间的关联被检验。以 Eyring 的激活理论，在 air-silicone-oil 散开过程的激活在硅酮油的动量运输与那相当不同：当后者的是否定的时，前者的激活熵是积极的。然而，二个过程的激活热含量在一样的数量级，它导致 D/T 是粗略地不变的观察。

关 键 词：AIR silicone oil hydraulic oil diffusion coefficient VISCOSITY 

分 类 号：O175.2[理学—数学] TQ423.95[理学—基础数学]