CFD Modeling and Residence Time Distribution in a Two-Inlet One-Outlet Stirred Tank

سال انتشار: 1392
محل انتشار: هفتمین کنفرانس دانشجویی مهندسی مکانیک
کد COI اختصاصی: ASCME07_050
زبان مقاله: انگلیسی
تعداد مشاهده: 1225

نویسندگان

Department of Chemical Engineering, University of Tabriz

چکیده

Two-inlet one-outlet stirred tanks are widely used in both small and large scale industries especially for dilution purposes. In this study, a computational fluiddynamics (CFD) model for simulation of a stirred tank was developed and evaluated experimentally. Two fluid flows with different physical properties were enteredinto a tank stirred by a six-blade turbine impeller. Multiple Reference Frame (MRF) technique and standard k-ε turbulence model in steady state form wereutilized to model fluids agitation in the tank. A user defined function (UDF) was also implemented fordefining flow viscosity. Moreover, unsteady state formwas used to analyze residence time distribution (RTD) in the tank. The simulation showed a successful andcomplete mixing of two flows corresponding to different inlets. Results demonstrated operational effects of turbine impeller on the fluid flow. Impeller forcedflows vigorously toward the tank walls and after stroke with walls, flows changed suddenly their rout and moved upward or downward; these violent motionsdeveloped a well-mixed pattern and consequently caused two fluids to be dispersed in the tank. In addition, RTD analysis proved that increase in impellerspeed makes the mixing process closer to the perfect agitation and reduces residence time discrepancies ofdifferent paths of fluids. This study makes it easier to understand flow behavior in two-inlet one-outlet stirred tanks and provides engineers with supplementary scale up information.

کلیدواژه ها

CFD, Stirred tank, UDF, Turbine impeller,Residence time

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