scholarly journals 3D Numerical Study of Multiphase Counter-Current Flow within a Packed Bed for Post Combustion Carbon Dioxide Capture

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1441 ◽  
Author(s):  
Li Yang ◽  
Fang Liu ◽  
Zhengchang Song ◽  
Kunlei Liu ◽  
Kozo Saito
Keyword(s):  
Carbon Dioxide ◽  
Current Flow ◽  
Numerical Study ◽  
Carbon Dioxide Capture ◽  
Packed Bed ◽  
Counter Current Flow ◽  
Counter Current

Experimental and Numerical Study of Counter-Current Flow in a Vertical Pipe

2014 ◽  
Author(s):  
Giorgio Besagni ◽  
Gaël Guédon ◽  
Fabio Inzoli
Keyword(s):  
Void Fraction ◽  
Current Flow ◽  
Numerical Study ◽  
Bubble Diameter ◽  
Optical Probe ◽  
Numerical Results ◽  
Operating Conditions ◽  
Local Flow ◽  
Counter Current Flow ◽  
Counter Current

Counter current flow is encountered in a wide variety of industrial applications ranging from flows in nuclear reactors to process flows in chemical reactors. This paper describes experimental and numerical results obtained in a circular column of 240 mm inner diameter with two inner pipes. The counter current flow studied concerns an upward flow of air and a downward flow of water at ambient temperature and pressure. The following range of operating conditions is analyzed: superficial air velocities up to 0.25 m/s and superficial water velocities up to 0.04 m/s, corresponding to global void fractions up to 27.7%. The experimental investigations concerns (i) flow visualization, (ii) local data from a double optical probe and (iii) global void fraction data. Images obtained from an optical camera are used to observe the general flow pattern and to support the boundary conditions of the numerical simulations, in terms of average bubble diameter. Data obtained from the double optical probe are used to study local flow characteristics. The gas disengagement technique is used to obtain the global void fraction over a range of superficial air velocities for the validation of the numerical method. Numerical calculations are performed with an Eulerian two-fluid model using the commercial code ANSYS Fluent Release 14.5.7 and results are compared with experimental data. The effects of bubble diameter and various interfacial drag coefficients are studied. The formulation of the drag coefficient is found to have significant effects on the global void fraction predictions. However, using merely the drag law, numerical results are inaccurate.

scholarly journals CFD Modeling on Hydrodynamic Characteristics of Multiphase Counter-Current Flow in a Structured Packed Bed for Post-Combustion CO2 Capture

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3103 ◽  
Author(s):  
Li Yang ◽  
Fang Liu ◽  
Kozo Saito ◽  
Kunlei Liu
Keyword(s):  
Co2 Capture ◽  
Current Flow ◽  
Packed Bed ◽  
Cfd Modeling ◽  
Hydrodynamic Characteristics ◽  
Co2 Absorption ◽  
Structured Packing ◽  
Factors Affecting ◽  
Counter Current Flow ◽  
Counter Current

Solvent-based post combustion CO2 capture is a promising technology for industrial application. Gas-liquid interfaces and interactions in the packed bed are considered one of the key factors affecting the overall CO2 absorption rate. Understanding the hydrodynamic characterizations within packed beds is essential to identify the appropriate enhanced mass transfer technique. However, multiphase counter-current flows in the structured packing typically used in these processes are complicated to visualize and optimize experimentally. In this paper, we aim to develop a comprehensive 3D multiphase, counter-current flow model to study the liquid/gas behavior on the surface of structured packing. The output from computational fluid dynamics (CFD) clearly visualized the hydrodynamic characterizations, such as the liquid distributions, wettability, and film thicknesses, in the confined packed bed. When the liquid We (Weber number) was greater than 2.21, the channel flow became insignificant and flow streams became more disorganized with more droplets at larger sizes. The portion of dead zones is decreased at higher liquid We, but it cannot be completely eliminated. Average film thickness was about 0.6–0.7 mm, however, its height varied significantly.

Hydrodynamics of gas–liquid counter-current flow in solid foam packings

2005 ◽  
Vol 60 (22) ◽  
pp. 6422-6429 ◽  
Author(s):  
C.P. Stemmet ◽  
J.N. Jongmans ◽  
J. van der Schaaf ◽  
B.F.M. Kuster ◽  
J.C. Schouten
Keyword(s):  
Current Flow ◽  
Solid Foam ◽  
Counter Current Flow ◽  
Counter Current
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