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

丁川; 范毓润

doi:10.1016/S1004-9541(11)60155-9

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

Updated：2026-01-06

- Measurement of Diffusion Coefficients of Air in Silicone Oil and in Hydraulic Oil
- Chinese Journal of Chemical Engineering Vol. 19, Issue 2, Pages: 205-211(2011)
- Affiliations：
  
  State Key Lab of Fluid Power Transmission and Control, Zhejiang University,Hangzhou,China,310027
- Author bio：
- Funds：
- DOI：10.1016/S1004-9541(11)60155-9
  CLC：
- Published：2011
- Accepted：
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DING Chuan, FAN Yurun. Measurement of Diffusion Coefficients of Air in Silicone Oil and in Hydraulic Oil[J]. , 2011, 19(2): 205-211.
DOI：

DING Chuan, FAN Yurun. Measurement of Diffusion Coefficients of Air in Silicone Oil and in Hydraulic Oil[J]. , 2011, 19(2): 205-211. DOI： 10.1016/S1004-9541(11)60155-9.

摘要

Abstract

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

and solvent viscosity

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

is roughly constant.

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