文献类型：期刊文献

英文题名：Effects of shear thinning behavior on the film formation characteristics of vertical disk reactors: A CFD simulation study of non-Newtonian fluids

作者：Zhang, Xincheng[1];Zhang, Lin[1];Wang, Xuesong[1];Zhou, Yuning[1];Guo, Wenze[1,2];Zhao, Ling[1,3];Xi, Zhenhao[1,3];Yuan, Weikang[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn & Low Carbon Technol, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Smart Mfg Energy Chem Proc, Minist Educ, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：219

外文期刊名：CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION

收录：;EI(收录号：20260820092886);WOS:【SCI-EXPANDED(收录号:WOS:001610905000001)】；

基金：The authors gratefully acknowledge the financial support from the National Science and Technology Major Project of China (No. 2024XXXXX2700) , the National Natural Science Foundation of China (Grant No. 22408099) , the Key Research and Development Program of Xinjiang Uygur Autonomous Region (No. 2022B01032) , and the Na-tional Ten Thousand Talents Program.

语种：英文

外文关键词：Non-Newtonian fluids; Average film thickness; Rheological properties; Film-forming process; Shear thinning

摘要：Vertical disk reactors are widely implemented as gas-liquid contactors for polymer solutions. The inherent shear-thinning characteristics of these solutions critically influence the dynamic film-forming process, thus affecting the overall mass transfer efficiency. In this work, Carreau-Yasuda model was coupled through the user-defined functions (UDF) module to characterize the rheological properties of the polymer solutions. Combined with the volume of fluid (VOF) method, this approach enabled to simulate the process of film formation and the distribution of film thickness across the rotating disk. Numerical results reveal a non-monotonical varying relation between rotational speed and the average film thickness for non-Newtonian fluids, with the shear thinning effect and the rotational speed-governed thickening effect alternately dominating the variation in average film thickness. Parametric analysis demonstrates that the relaxation time (7) primarily determines the beginning position of the transition zone, with increasing 7 values inducing an earlier viscosity reduction through lower critical shear rates. The lower the non-Newtonian index (n), the faster the viscosity decreases (steeper slope of gamma(center dot)(n-1)), intensifying shear-thinning. These findings provide insights for optimizing reactor operation parameters to achieve targeted film characteristics and enhanced mass transfer performance in polymer processing.