论文信息 - EVALUATION OF A METHOD FOR MEASURING MIXING TIME USING NUMERICAL SIMULATION AND EXPERIMENTAL DATA

EVALUATION OF A METHOD FOR MEASURING MIXING TIME USING NUMERICAL SIMULATION AND EXPERIMENTAL DATA

A method for measuring mixing performance in large-scale vessels is investigated. The method is evaluated experimentally in a pilotscale reactor and by using a model based on the three-dimensional calculation of the flow field. The method is based on injection of a tracer and measuring the concentration with several detectors at different locations. The mixing performance is measured as the decay rate of the difference between the concentration at the detectors and the final concentration. The model predicts a strong dependence on injection point. The assumption of a first-order decay rate of the concentration deviation is more appropriate for some injection points.

Bengt Andersson | Martin Lundén | Olle Stenberg

[1] J. Bourne,et al. Reactive mixing in agitated tanks , 1991 .

[2] Jyeshtharaj B. Joshi,et al. LIQUID PHASE MIXING IN MECHANICALLY AGITATED VESSELS , 1988 .

[3] Predrag Horvat,et al. Engineering approach to mixing quantification in bioreactors , 1992 .

[4] Suzanne M. Kresta,et al. Prediction of the three-dimensional turbulent flow in stirred tanks , 1991 .

[5] Vivek V. Ranade,et al. Fluid mechanics and blending in agitated tanks , 1991 .

[6] M. Lundén. SIMULATION OF THREE-DIMENSIONAL FLOW IN STIRRED VESSELS. INFLUENCE OF THE IMPELLER MODELING AND SCALE-UP , 1995 .

[7] Predrag Horvat,et al. Mixing-models applied to industrial batch bioreactors , 1993 .

[8] Octave Levenspiel,et al. New scale-up and design method for stirrer agitated batch mixing vessels , 1976 .

[9] Michael Yianneskis,et al. An experimental study of the steady and unsteady flow characteristics of stirred reactors , 1987, Journal of Fluid Mechanics.

[10] J. C. Middleton,et al. Computations of flow fields and complex reaction yield in turbulent stirred reactors, and comparison with experimental data , 1986 .

[11] J. Landau,et al. Studies on mixing. XII. Homogenation of miscible liquids in the turbulent region , 1961 .

[12] Ivan Fořt,et al. CHAPTER 14 – Flow and Turbulence in Vessels with Axial Impellers , 1986 .

[13] Vivek V. Ranade,et al. Flow generated by a disc turbine. II: Mathematical modelling and comparison with experimental data , 1990 .