Abstract—In this paper analysis is carried out on the response of hydrodynamics to the relative position of stirrer and baffles when Multiple Reference Frame (MRF) technique is used to simulate a mixing tank of single and multiphase systems. A typical stirred reactor equipped with four baffles and a six-blade Rushton turbine is studied. Operational conditions of constant speed (5 rps) and 2.653·10-4 m/s gas superficial velocity with constant bubble size (1 mm) were applied. The simulations were performed in ANSYS Workbench (FLUENT) 16.0 with four different angles of impeller blade with regard to baffles. The results were averaged over two utmost and all four impeller blade positions and validated against experimental data, produced by means of Particle Image Velocimetry. Comparison of the simulated and experimental results was executed using profiles of velocity components along sampled lines, representing various zones in the vessel. The impeller angle of rotation with respect to the position of baffles was found to contribute to the overall reactor hydrodynamics especially in multiphase systems. Averaging of the simulation results over all impeller positions was shown to enhance the accuracy of the simulated results of single phase and multiphase mixing hydrodynamics.
Index Terms—Stirred tank, multiphase, CFD, PIV, validation.
D. V. Gradov is with Lappeenvanta University of Technology, Finland (e-mail: dmitry.gradov@lut.fi). A. Laari and T. Koiranen are with Lappeenvanta University of Technology, Finland (e-mail: arto.laari@lut.fi, tuomas.koiranen@lut.fi).
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Cite: D. V. Gradov, A. Laari, and T. Koiranen, "Influence of the Relative Position of Impeller and Baffles in Multiple Reference Frame Simulation of Gas-Liquid Mixing in Stirred Tank," International Journal of Chemical Engineering and Applications vol. 8, no. 1, pp. 53-60, 2017.
