scholarly journals CFD simulation and experimental measurement of gas holdup and liquid interstitial velocity in internal loop airlift reactor

2011 ◽  
Vol 66 (14) ◽  
pp. 3268-3279 ◽  
Author(s):  
M. Šimčík ◽  
A. Mota ◽  
M.C. Ruzicka ◽  
A. Vicente ◽  
J. Teixeira
Keyword(s):  
Experimental Measurement ◽  
Cfd Simulation ◽  
Gas Holdup ◽  
Airlift Reactor ◽  
Internal Loop ◽  
Interstitial Velocity

Experiment and CFD Simulation on Gas Holdup Characteristics in an Internal Loop Reactor with External Liquid Circulation

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Chunxi Lu ◽  
Nana Qi ◽  
Kai Zhang ◽  
Jiaqi Jin ◽  
Hu Zhang
Keyword(s):  
Cfd Simulation ◽  
Gas Holdup ◽  
Gas Velocity ◽  
Loop Reactor ◽  
Internal Loop ◽  
Liquid Circulation ◽  
Liquid Phases ◽  
Ansys Cfx ◽  
Other Information ◽  
Superficial Gas Velocity

An external liquid circulation is introduced into a traditional internal loop reactor in order to improve liquid circulation and increase the interface between gas and liquid phases. The effects of superficial gas velocity and external liquid circulation velocity on local and overall gas holdups are explored experimentally and numerically in the loop section of a combined gas-liquid contactor, which consists of a liquid spray, sieve plates and an internal loop with external liquid circulation. Local gas holdup is measured experimentally by a double-sensor conductivity probe. Numerical simulations are conducted in the platform of a commercial software package, ANSYS CFX 10.0. Gas holdup and other information are obtained by solving the governing equations of mass and momentum balances for gas and liquid phases in a hybrid mesh system. Both measured and simulated results indicate that local, section-averaged, and overall gas holdups increase with an increase of the superficial gas velocity. The downcomer tube for circulating external liquid has a significant influence in the gas-distributor and the downcomer-tube action regions rather than in the upper draft-tube and the gas-liquid separation regions. Good agreement between measured and predicted data suggests that CFD simulation together with experimental investigation can be employed to develop novel gas-liquid contactors with a complex geometrical configuration.

Hydrodynamic behaviors and mixing characteristics in an internal loop airlift reactor based on CFD simulation

2016 ◽  
Vol 113 ◽  
pp. 125-139 ◽  
Author(s):  
Kiattichai Wadaugsorn ◽  
Sunun Limtrakul ◽  
Terdthai Vatanatham ◽  
Palghat A. Ramachandran
Keyword(s):  
Cfd Simulation ◽  
Airlift Reactor ◽  
Internal Loop ◽  
Mixing Characteristics ◽  
Hydrodynamic Behaviors

CFD simulation of internal-loop airlift reactor using EMMS drag model

Particuology ◽  
2015 ◽  
Vol 19 ◽  
pp. 124-132 ◽  
Author(s):  
Tingting Xu ◽  
Xuedong Jiang ◽  
Ning Yang ◽  
Jiahua Zhu
Keyword(s):  
Cfd Simulation ◽  
Airlift Reactor ◽  
Drag Model ◽  
Internal Loop

scholarly journals PBM-CFD Investigation of the Gas Holdup and Mass Transfer in a Lab-Scale Internal Loop Airlift Reactor

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 2711-2719 ◽  
Author(s):  
Shuo Zhang ◽  
Zong-Yang Lv ◽  
David Muller ◽  
Gunter Wozny
Keyword(s):  
Mass Transfer ◽  
Gas Holdup ◽  
Airlift Reactor ◽  
Internal Loop

CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor

2017 ◽  
Vol 12 (4) ◽  
Author(s):  
Shi Yan Liew ◽  
Jolius Gimbun
Keyword(s):  
Cfd Simulation ◽  
Predictive Accuracy ◽  
Liquid Velocity ◽  
Fluid Model ◽  
Gas Holdup ◽  
Airlift Reactor ◽  
Turbulent Dispersion ◽  
Dispersion Force ◽  
Phase System ◽  
Closure Model

AbstractTwo-fluid model approach to simulate gas-liquid airlift reactors is widely implemented but have yet to reach a consensus on the closure model to account the gas-liquid interphase forces. Proper selection of a closure model is required in order to accurately capture the hydrodynamics in the complex of the two-phase system. Our work concerns the evaluation of the interfacial forces models (i. e. drag, lift and turbulent dispersion force) and their effects on local gas holdup and liquid velocity. A transient three-dimensional airlift reactor simulation was carried out using computational fluid dynamics by implementing the dispersed standardk-εturbulence model. Four drag models governed by spherical bubble, bubble deformation and Rayleigh-Taylor were being evaluated in our work. The significance on the inclusion of the lift model on predictive accuracy on the flow field was also studied as well. Whereas, two turbulent dispersion force models were selected to evaluate on their performance in improving the predictive accuracy of the local hydrodynamics. Results showed that the drag governed by Rayleigh-Taylor which accounts the bubble swarm effect had better predictions on the gas holdup in the downcomer and improved predictions in radial gas holdup. The inclusion of the lift model improved local gas holdup predictions at higher heights of the reactor and shifted the bubble plume towards the centre region of the riser. Meanwhile, the turbulent dispersion models improved the overall results of predicted local gas holdup with closer agreement obtained when the drift velocity model was considered in the simulation. The axial liquid velocity was well predicted for all cases. The consideration of the drag, lift and turbulent dispersion forces resulted in a closer agreement with experimental data.

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