Petroleum Science >2019,??Issue 6:??1-16 DOI: https://doi.org/10.1007/s12182-019-0338-2
A model for transient diffusion in bidisperse pore structures Open?Access
文章信息
作者：Wei Sun, Sheng-Li Chen, Ming-Ri Xu, Ya-Qian Wei, Ting-Ting Fan, Bao-Li Ma, Jin-Tao Guo
作者單位：
State Key Laboratory of Heavy Oil Processing and Department of Chemical Engineering, China University of Petroleum, Changping, Beijing, People’s Republic of China; Daqing Petrochemical Research Center, CNPC, Daqing, China
投稿時間：2019-01-14
引用方式：Sun, W., Chen, SL., Xu, MR. et al. Pet. Sci. (2019). https://doi.org/10.1007/s12182-019-0338-2
文章摘要
A bidisperse model for transient diffusion and adsorption processes in porous materials is presented in this paper. The mathematical model is solved by numerical methods based on finite elements combined with the linear driving force approximation. A criterion based on the model to identify the diffusion controlling mechanism (macropore diffusion, micropore diffusion, or both) is proposed. The effects of different adsorption isotherms (linear, Freundlich, or Langmuir) on the concentration profiles and on curves of fractional uptake versus time are investigated. In addition, the influences of model parameters concerning the pore networks on the fractional uptake are studied as well.
關鍵詞
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Transient diffusion, Adsorption, Bidisperse pores, Macropore, Micropore, Linear driving force