Residence time distribution in a liquid flowing cocurrently with a gas through a packed bed

1979 ◽  
Vol 57 (4) ◽  
pp. 409-415 ◽  
Author(s):  
J. B. Stepanek ◽  
S. K. Achwal
Keyword(s):  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Packed Bed

scholarly journals Modeling Residence Time Distribution (RTD) Behavior in a Packed-Bed Electrochemical Reactor (PBER)

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Sananth H. Menon ◽  
G. Madhu ◽  
Jojo Mathew
Keyword(s):  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Flow Model ◽  
Plug Flow ◽  
Flow Characteristics ◽  
Theoretical Models ◽  
Packed Bed ◽  
Electrochemical Reactor ◽  
Tracer Studies

This paper focuses on understanding the electrolyte flow characteristics in a typical packed-bed electrochemical reactor using Residence Time Distribution (RTD) studies. RTD behavior was critically analyzed using tracer studies at various flow rates, initially under nonelectrolyzing conditions. Validation of these results using available theoretical models was carried out. Significant disparity in RTD curves under electrolyzing conditions was examined and details are recorded. Finally, a suitable mathematical model (Modified Dispersed Plug Flow Model (MDPFM)) was developed for validating these results under electrolyzing conditions.

scholarly journals Numerical study of flow inhomogeneity and heat transfer enhancement in structured packed beds

2020 ◽  
Vol 24 (6 Part A) ◽  
pp. 3533-3542
Author(s):  
Jingyu Wang ◽  
Jian Yang ◽  
Bengt Sunden ◽  
Qiuwang Wang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Packed Bed ◽  
Transfer Enhancement ◽  
Heat Transfer Characteristics ◽  
Simple Cubic ◽  
Flow Maldistribution

Packed beds are widely used in engineering applications due to their high specific surface area and good heat transfer characteristics. A grille-sphere composite packed bed is proposed previously and has been proved to have higher overall heat transfer coefficient than the simple cubic packing structure. In the present paper, the flow inhomogeneities in both the grille-sphere composite packed bed and the simple cubic packing are studied and the relationship between the flow inhomogeneity and the heat transfer characteristics is revealed by numerical simulations. The simulations are performed on ANSYS FLUENT software. The turbulence flow is modelled by the renormalization group k- model. Both dispersion of the velocity distribution and the residence time distribution are employed to assess the flow maldistribution. When the inlet velocity equals 2.17 m/s, the variance of the residence time distribution of the composite packed bed is 5.91% smaller than that of the simple cubic packing while the Nusselt number is 10.64% higher. The results indicate that less flow maldistribution can lead to heat transfer enhancement.

scholarly journals Mathematical modelling of the residence time distribution of CO2 tracer in a three-phase micro-packed bed reactor: An experimental analysis

2021 ◽  
Vol 10 (9) ◽  
pp. e23210917425
Author(s):  
Jornandes Marcelo da Silva ◽  
Vitória da Fonseca Dias ◽  
Jornandes Dias da Silva
Keyword(s):  
Experimental Data ◽  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Adsorption Process ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Experimental Measurements ◽  
Three Phase ◽  
The Mathematical Model

This study reports the residence time distribution (RTD) using CO2 as tracer in Three-phase micro-packed bed (TP-mPB) reactor. Experimental measurements were obtained at the inlet and at the outlet from TP-mPB reactor using the injection of small amount (3%) of CO2 tracer inside the sweep gas current. The dynamic model characterizes a diffusion-adsorption process of CO2 tracer in terms of mass transfer phenomena (external and internal). The mathematical model was validated against a set of experimental data where simulated results of CO2 tracer adequately matched the experimental measures at the outlet of the micro-packed bed.

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