Shear rate analysis of water dynamic in the continuous stirred tank

10th International Conference Numerical Analysis in Engineering

数学;工业技术

Tulus^1 ; Mardiningsih^1 ; Sawaluddin^1 ; Sitompul, O.S.^2 ; Ihsan, A.K.A.M.^3

Department of Mathematics, University of Sumatera Utara (USU), Kampus USU, Jl. Bioteknologi No.1, Medan

20155, Indonesia^1

Department of Information Technology, University of Sumatera Utara (USU), Kampus USU, Jl. Universitas No.9, Medan

20155, Indonesia^2

Department of Mechanical Engineering, National University of Malaysia (UKM), Bangi, Selangor

4600, Malaysia^3

关键词: Biogas production;    Continuous stirred tank reactor;    Continuous stirred tanks;    Cylindrical tanks;    Fluid dynamic phenomenon;    Maximum shears;    Stirring speed;    Water dynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/308/1/012048/pdf
DOI  :  10.1088/1757-899X/308/1/012048

学科分类：工业工程学

来源: IOP

【 摘 要 】

Analysis of mixture in a continuous stirred tank reactor (CSTR) is an important part in some process of biogas production. This paper is a preliminary study of fluid dynamic phenomenon in a continuous stirred tank numerically. The tank is designed in the form of cylindrical tank equipped with a stirrer. In this study, it is considered that the tank is filled with water. Stirring is done with a stirring speed of 10rpm, 15rpm, 20rpm, and 25rpm. Mathematical modeling of stirred tank is derived. The model is calculated by using the finite element method that are calculated using CFD software. The result shows that the shear rate is high on the front end portion of the stirrer. The maximum shear rate tend to a stable behaviour after the stirring time of 2 second. The relation between the speed and the maximum shear rate is in the form of linear equation.