[en] In the modeling of gas-liquid separation processes in structured packings, fluid dynamics is often reduced to a
uniform liquid film flow over the packing surface. However, previous experiments with X-ray tomography
indicate that this assumption is not valid when the liquid-phase viscosity is significantly higher than 1 mPa s. In
order to improve existing modeling approaches for viscous systems, a better understanding of the influence of
the liquid viscosity on the liquid flow inside the structured packing is necessary. In this work, X-ray tomography
is used to investigate the flow morphology of liquid systems with low surface tension and a viscosity up to
50 mPa s. An empirical correlation that describes the hold-up fraction of the existing flow patterns is given and
a modelling approach is proposed that allows to consider the influence of the different flow patterns on mass
transfer.
Disciplines :
Chemical engineering
Author, co-author :
Bolenz, Lukas; Paderborn University > Chair of Fluid Process Engineering,
Toye, Dominique ; Université de Liège - ULiège > Department of Chemical Engineering > Génie de la réaction et des réacteurs chimiques
Kenig, Euvgeny; Paderborn University > Chair of Fluid Process Engineering
Language :
English
Title :
Liquid Flow Morphology of Viscous Systems in Structured Packings: Investigations by X-ray Tomography
Publication date :
2019
Journal title :
Chemical Engineering Transactions
ISSN :
1974-9791
eISSN :
2283-9216
Publisher :
Italian Association of Chemical Engineering - AIDIC, Italy
Aferka, S., Crine, M., Saroha, A.K., Toye, D., Marchot, P., 2007, In situ measurements of the static liquid holdup in Katapak- SP12TM packed column using X-ray tomography, Chemical Engineering Science, 62, 6076-6080.
Aferka, S., Marchot, P., Crine, M., Toye, D., 2010a, Interfacial area measurement in a catalytic distillation packing using high energy X-ray CT, Chemical Engineering Science, 65, 511-516.
Aferka, S., Viva, A., Brunazzi, E., Marchot, P., Crine, M., Toye, D., 2010b, Liquid load point determination in a reactive distillation packing by X-ray tomography, The Canadian Journal of Chemical Engineering, 62, 611-617.
Aferka, S., Viva, A., Brunazzi, E., Marchot, P., Crine, M., Toye, D., 2011, Tomographic measurement of liquid hold up and effective interfacial area distributions in a column packed with high performance structured packings, Chemical Engineering Science, 66, 3413-3422.
Green, C.W., Farone, J., Briley, J.K., Eldridge, R.B., Ketcham, R.A., Nightingale, B., 2007, Novel Application of X-ray Computed Tomography: Determination of Gas/Liquid Contact Area and Liquid Holdup in Structured Packing, Industrial & Engineering Chemistry Research, 46, 5734-5753.
Janzen, A., Steube, J., Aferka, S., Kenig, E.Y., Crine, M., Marchot, P., Toye, D., 2013, Investigation of liquid flow morphology inside a structured packing using X-ray tomography, Chemical Engineering Science, 102, 451-460.
Kak, A.C., Slaney, M., 1988, Principles of computerized tomographic imaging, IEEE Press, New York, USA.
Otsu, N., 1979, A Threshold Selection Method from Gray-Level Histograms, IEEE Transactions on Systems, Man, and Cybernetics, 9, 62-66.
Rocha, J.A., Bravo, J.L., Fair, J.R., 1993, Distillation columns containing structured packings: a comprehensive model for their performance. 1. Hydraulic models, Industrial & Engineering Chemistry Research, 32, 641-651.
Schug, S., Arlt, W., 2016, Imaging of Fluid Dynamics in a Structured Packing Using X-ray Computed Tomography, Chemical Engineering & Technology, 39, 1561-1569.
Shilkin, A., Kenig, E.Y., 2005, A new approach to fluid separation modelling in the columns equipped with structured packings, Chemical Engineering Journal, 110, 87-100.
Toye, D., Crine, M., Marchot, P., 2005, Imaging of liquid distribution in reactive distillation packings with a new high-energy x-ray tomograph, Measurement Science and Technology, 16, 2213-2220.
Viva, A., Aferka, S., Brunazzi, E., Marchot, P., Crine, M., Toye, D., 2011, Processing of X-ray tomographic images: A procedure adapted for the analysis of phase distribution in MellapakPlus 752.Y and Katapak-SP packings, Flow Measurement and Instrumentation, 22, 279-290.
Wehrli, M., Kögl, T., Lindner, T., Arlt, W., 2018, An unobstructed view of liquid flow in structured packing, Chemical Engineering Transactions, 69, 775-780.
