CFD study of mixing miscible liquid with high viscosity difference in a stirred tank

Quality in Research: International Symposium on Materials, Metallurgy, and Chemical Engineering

材料科学;冶金学;化学工业

Madhania, S.^1,2 ; Cahyani, A.B.^2 ; Nurtono, T.^2 ; Muharam, Y.^1 ; Winardi, S.^2 ; Purwanto, W.W.^1

Chemical Engineering Department, Faculty of Engineering, Universitas Indonesia, Kampus Baru UI Depok, Depok

16424, Indonesia^1

Chemical Engineering Department, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya

60111, Indonesia^2

关键词: Computational analysis;    Distribution profiles;    High viscosities;    Marine propeller;    Miscible liquids;    Multiple-reference frames;    Solution strategy;    Transient calculation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/316/1/012014/pdf
DOI  :  10.1088/1757-899X/316/1/012014

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The mixing process of miscible liquids with high viscosity difference is crucial role even though the solution mutually dissolved. This paper describes the mixing behaviour of the water-molasses system in a conical-bottomed cylindrical stirred tank (D = 0.28 m and H = 0.395 m) equipped with a side-entry Marine propeller (d = 0.036 m) under the turbulence regime using a three-dimensional and transient CFD-simulation. The objective of this work is to compare the solution strategies was applied in the computational analysis to capture the detail phenomena of mixing two miscible liquid with high viscosity difference. Four solution strategies that have been used are the RANS Standards k- (SKE) model as the turbulence model coupled with the Multiple Reference Frame (MRF) method for impeller motion, the RANS Realizable k- (RKE) combine with the MRF, the Large Eddy Simulation (LES) coupled with the Sliding Mesh (SM) method and the LES-MRF combination. The transient calculations were conducted with Ansys Fluent 17.1 version. The mixing behaviour and the propeller characteristic are to be compared and discussed in this work. The simulation results show the differences of flow pattern and the molasses distribution profile for every solution strategy. The variation of the flow pattern which happened in each solution strategy showing an instability of the mixing process in stirred tank. The LES-SM strategy shows the realistic direction of flow than another solution strategies.