Доступ предоставлен для: Guest
Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Печать: 0276-1459
ISSN Онлайн: 1943-6181

Выпуски:
Том 32, 2020 Том 31, 2019 Том 30, 2018 Том 29, 2017 Том 28, 2016 Том 27, 2015 Том 26, 2014 Том 25, 2013 Том 24, 2012 Том 23, 2011 Том 22, 2010 Том 21, 2009 Том 20, 2008 Том 19, 2007 Том 18, 2006 Том 17, 2005 Том 16, 2004 Том 15, 2003 Том 14, 2002 Том 13, 2001 Том 12, 2000 Том 11, 1999 Том 10, 1998 Том 9, 1997 Том 8, 1994 Том 7, 1993 Том 6, 1992 Том 5, 1990 Том 4, 1989 Том 3, 1987 Том 2, 1986 Том 1, 1982

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v21.i1-2.80
pages 95-106

EFFECT OF DRAG MODELING ON THE PREDICTION OF CRITICAL REGIME TRANSITIONS IN AGITATED GAS-LIQUID REACTORS WITH BUBBLE SIZE DISTRIBUTION MODELING

Miriam Petitti
Department of Materials Science and Chemical Engineering, Politecnico di Torino, 10129 Torino, Italy
Daniele L. Marchisio
Politecnico di Torino, Department of Materials Science and Chemical Engineering, 10129 Torino, Italy
Marco Vanni
Dept. of Materials Science and Chemical Engineering, Politecnico di Torino, C.soDuca degli, Abruzzi, 24,10129 Torino
Giancarlo Baldi
Dept. of Materials Science and Chemical Engineering, Politecnico di Torino, C.soDuca degli, Abruzzi, 24,10129 Torino
Nicola Mancini
ENI R&M, 20097 S. Donato Milanese, Italy
Fabrizio Podenzani
Eni R&M, Via Maritano 26 20097 San Donato Mil. (MI), Italy

Краткое описание

A four baffled gas-liquid reactor, agitated by a Rushton turbine, has been modeled in a wide range of operating conditions (mixing intensities and gas flow numbers) by using a Eulerian multifluid approach coupled with a population balance model to describe the evolution of the bubble size distribution. In particular, the work has focused on the role played by drag force, calculated by resorting to the Tomiyama correlation and the Bakker correction for the slip turbulent reduction, on the predictions of fluid-dynamics regime transitions and of the structure assumed by the gas phase near the turbine blades. This investigation was carried out under very different operating conditions, also assessing the ability of the model to predict global data such as the overall gas hold-up and power number. Simulations were carried out via the commercial computational fluid dynamics code Fluent, and both the drag and the population balance model were implemented through user-defined functions and subroutines. Comparisons with correlations based on experimental data and directly with experimental data for the bubble size distribution, also at quite high gas hold-ups, showed that the Bakker correction for the slip turbulent reduction, when implemented with the standard constant values, underestimates the overall drag force. In order to improve agreement with experimental data, new constant values are proposed.

ЛИТЕРАТУРА

  1. Bakker, A. and van den Akker, H. E. A., A computational model for the gas-liquid flow in stirred reactors.

  2. Bombac, A., Zun, I., and Filipic, B., Gas-filled cavity structures and local void fraction distribution in aerated stirred vessel. DOI: 10.1002/aic.690431105

  3. Gezork, K. M., Bujalski, W., Cooke, M., and Nienow, A. W., The transition from homogeneous to heterogeneous flow in a gassed stirred vessel. DOI: doi:10.1205/026387600527482

  4. Gordon, R. G., Error bounds in equilibrium statistical mechanics. DOI: 10.1063/1.1664624

  5. Laakkonen, M., Alopaeus, V., and Aittamaa, J., Validation of bubble breakage, coalescence and mass transfer models for gas–liquid dispersion in agitated vessel. DOI: 10.1016/j.ces.2004.11.066

  6. Marchisio, D. L., Vigil, D. R., and Fox, R. O., Quadrature method of moments for aggregation-breakage processes. DOI: 10.1016/S0021-9797(02)00054-1

  7. McGraw, R., Correcting moment sequences for errors associated with advective transport.

  8. Nienow, A. W., Wisdom, D. J., and Middleton, J. C., The effect of scale and geometry on flooding.

  9. Nienow, A. W., Warmoeskerken, M. M. C. G., Smith, J. M., and Konno, M., On the flooding/loading transition and the complete dispersal condition in aerated vessels agitated by a Rushton turbine.

  10. Patterson, G. K., Measurements and modeling of flow in gas sparged agitated vessels.

  11. Paul, E. L., Atiemo-Obeng, V. A., and Kresta, S. M., Handbook of Industrial Mixing.

  12. Petitti, M., Caramellino, M., Marchisio, D. L., and Vanni, M., Two-scale simulation of mass transfer in an agitated gas-liquid tank.

  13. Shohat, J. A. and Tamarkin, J. D., The Problem of Moments.

  14. Tomiyama, A., Drag, lift and virtual mass forces acting on a single bubble.

  15. Warmoeskerken, M. M. C. G. and Smith, J. M., Flow regime maps for Rushton turbines.


Articles with similar content:

SIMULATION AND VISUALIZATION OF FLOCK PARTICLES ON A GLOVE SURFACE IN A TWO-PHASE FLOW
Journal of Flow Visualization and Image Processing, Vol.17, 2010, issue 4
Piyawut Kaewrit, Chawalit Kittichaikarn
EXPERIMENTAL STUDIES AND MODELLING OF FOUR-WAY COUPLING IN PARTICLE-LADEN HORIZONTAL CHANNEL FLOW
TSFP DIGITAL LIBRARY ONLINE, Vol.2, 2001, issue
Johannes Kussin , Martin Sommerfeld, Santiago Lain
EULER-EULER TWO-FLUID MODEL BASED CODE DEVELOPMENT FOR TWO-PHASE FLOW SYSTEMS
Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), Vol.0, 2017, issue
Sanjeev Kumar, Arun K. Saha, Prabhat Munshi
A GENERAL PARTICLE DISPERSION MODEL FOR LAGRANGIAN TRAJECTORY SIMULATION OF TWO-PHASE FLOWS IN CURVILINEAR COORDINATES
Turbulence and Shear Flow Phenomena -1 First International Symposium, Vol.0, 1999, issue
Jose C. F. Pereira, X.-Q. Chen
THE ENERGY SPECTRUM ANALOGY BREAKUP (SAB) MODEL FOR THE NUMERICAL SIMULATION OF SPRAYS
Atomization and Sprays, Vol.21, 2011, issue 12
Chawki Habchi