Effect of Some Design Parameters on the Flow Fields and Power Consumption in a Vessel Stirred by a Rushton Turbine

Abstract

Knowledge of the fluid dynamic characteristics in a stirred vessel is essential for reliable design and scale-up of a mixing system. In this paper, 3D hydrodynamics in a vessel agitated by a Rushton turbine were numerically studied (with the help of a CFD computer program (CFX 13.0)). The study was carried out covering a wide Reynolds number range: 10 4 -10 5 . Computations, based on control volume method, were made using the k-ε model. Our main purpose was to investigate the effect of vessel configuration and agitation rates on the flow structure and power consumption. Three types of vessels were used: unbaffled, baffled and a vessel with slots placed at the external perimeter of its vertical wall. The effect of slot length has been investigated. The comparison of our predicted results with available experimental data shows a satisfactory agreement.

Numerical simulations of hydrodynamics and concentration distribution in a stirred tank during startup stage for producing phenylboronic acid ester

“…To make sure that the CFD models are reliable to describe hydrodynamics inside the tank, the simulation results of radical velocity and axial velocity are validated with open experimental curves done by Wu and Patterson, who measured the turbulence flow with a Laser‐Doppler velocimeter. Besides, several previous simulated cases, which were done by Kamla et al, Youcefi et al, Sun et al and Feng et al, are also presented, as it can be seen in Figure . In the present validation case, standard k‐ε model and standard wall functions are applied.…”

“…32,36,37 However, such methods are generally too expensive for engineering applications. As for applications of various CFD methods in structure design and operational condition optimization for industrial reactors, most efforts have focused on the flow structures and hydrodynamics with emphasis on the influences of baffles, [38][39][40][41] dual impellers, 42 impeller clearance, and spacing. [43][44][45][46] There were only few works to investigate the transient hydrodynamics in reactors during the stop stage of the whole process.…”

Effect of baffles shape on the flow patterns and power consumption in stirred vessels

“…In stirred tanks, the hydrodynamics induced are mainly dependent upon the impeller design and interaction of flow with tank internals [1][2][3][4]. Several works have been achieved by numerical simulations on the turbulent flows induced by the Rushton turbine [5][6][7]. Among other papers, Montante et al [8] conducted a simulation of the effect of varying impeller clearances from the tank bottom on the hydrodynamics and power consumption for the Rushton turbine.…”

Simulation of Viscoplastic Flows in a rotating Vessel Using a Regularized Model

“…To date, many efforts have been made [7] for this class of fluids by experimental works and numerical studies namely Bouaifi and Roustan [8]; Niedzielski and Kuncewicz [9]; Rajeev et al, [10]; Rudolph et al [11], and numerical studies namely Amadei and Savage [12]; Anne-Archard et al [13]; Burgos et al [14]; Rahmani et al [15]; Pedrosa and Nunhez [16]; Yan and James [17]. ___________________________________ *Corresponding Author: benmoussa.a@hotmail.fr For a long time, stirred vessels have been done over the years through experimental investigation for a number of different impellers, vessel geometries, and fluid rheology.…”