Limits of stable fluidization regimes in vessel with inclined gas distributor grid

1982 ◽  
Vol 18 (1) ◽  
pp. 20-24
Author(s):  
N. I. Gel'perin ◽  
V. G. Ainshtein ◽  
L. D. Pogorelaya ◽  
V. A. Lyamkin ◽  
N. I. Terekhov ◽  
...  
Keyword(s):  
Gas Distributor ◽  
Distributor Grid ◽  
Stable Fluidization

scholarly journals CFD Modelling of a Hydrogen/Air PEM Fuel Cell with a Serpentine Gas Distributor

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 564
Author(s):  
Alessandro d’Adamo ◽  
Matteo Riccardi ◽  
Massimo Borghi ◽  
Stefano Fontanesi
Keyword(s):  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Catalyst Layer ◽  
Active Surface ◽  
Reaction Rates ◽  
Transport Processes ◽  
Proton Exchange ◽  
Sustainable Mobility ◽  
Cfd Modelling ◽  
Gas Distributor

Hydrogen-fueled fuel cells are considered one of the key strategies to tackle the achievement of fully-sustainable mobility. The transportation sector is paying significant attention to the development and industrialization of proton exchange membrane fuel cells (PEMFC) to be introduced alongside batteries, reaching the goal of complete de-carbonization. In this paper a multi-phase, multi-component, and non-isothermal 3D-CFD model is presented to simulate the fluid, heat, and charge transport processes developing inside a hydrogen/air PEMFC with a serpentine-type gas distributor. Model results are compared against experimental data in terms of polarization and power density curves, including an improved formulation of exchange current density at the cathode catalyst layer, improving the simulation results’ accuracy in the activation-dominated region. Then, 3D-CFD fields of reactants’ delivery to the active electrochemical surface, reaction rates, temperature distributions, and liquid water formation are analyzed, and critical aspects of the current design are commented, i.e., the inhomogeneous use of the active surface for reactions, limiting the produced current and inducing gradients in thermal and reaction rate distribution. The study shows how a complete multi-dimensional framework for physical and chemical processes of PEMFC can be used to understand limiting processes and to guide future development.

Effect of gas distributor on gas–liquid dispersion and mass transfer characteristics in stirred tank

2019 ◽  
Vol 145 ◽  
pp. 314-322 ◽  
Author(s):  
Baoqing Liu ◽  
Qing Xiao ◽  
Ning Sun ◽  
Pengfei Gao ◽  
Fangyi Fan ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Stirred Tank ◽  
Transfer Characteristics ◽  
Gas Distributor ◽  
Liquid Dispersion

Study on the Gas Distribution Characters of the Outsize CO2 Absorber of the Flue Gas in the Coal-Fired Power Plant

2014 ◽  
Vol 962-965 ◽  
pp. 1476-1479
Author(s):  
Bing Cheng Liu ◽  
Wen Feng Dong ◽  
De Biao Zhou ◽  
Qian Liang ◽  
Qing Ling Li
Keyword(s):  
Flow Field ◽  
Flue Gas ◽  
Annular Flow ◽  
Theoretical Foundation ◽  
Co2 Absorption ◽  
Technological Parameters ◽  
Absorption Column ◽  
Gas Distributor ◽  
Column Wall ◽  
Fluent Software

In the article the flow field in the twin-tangential annular flow gas distributor was simulated based on the standard k-ε turbulent model with FLUENT software according to various distance L between sleeve and column wall and differing numbers of baffles, after comprehensively analyzing, got the best technological parameters with misdistribution factor and pressure drop. Based on the analysis of the flow field discipline of the twin-tangential annular flow gas distributor and the two-line vane gas distributor, and the systematic comparison of the performance of these two kinds of gas distributors in the flue gas CO2 absorption column, the research will provide the important theoretical foundation for the choosing and designing of the distributor of the flue gas CO2 absorber.

Gas holdup in an external-loop air-lift fermentor with a contaminated gas distributor

1985 ◽  
Vol 27 (7) ◽  
pp. 1092-1094 ◽  
Author(s):  
W. J. McManamey ◽  
D. A. J. Wase ◽  
S. Raymahasay
Keyword(s):  
Gas Holdup ◽  
External Loop ◽  
Gas Distributor ◽  
Air Lift

scholarly journals Determination of the ozone volumetric mass transfer coefficient in bubble column with two-fluid nozzle gas distributor

2015 ◽  
Vol 69 (5) ◽  
pp. 553-559 ◽  
Author(s):  
Milica Djekovic-Sevic ◽  
Nevenka Boskovic-Vragolovic ◽  
Ljiljana Takic ◽  
Radmila Garic-Grulovic ◽  
Srdjan Pejanovic
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Bubble Column ◽  
Operating Conditions ◽  
Volumetric Mass Transfer Coefficient ◽  
Gas Distributor ◽  
Liquid Mass Transfer ◽  
Two Fluid

Experimental investigation of gas-liquid mass transfer of ozone in water, in bubble column with two-fluid nozzle gas distributor (BKDM), under different operating conditions, are presented in this work. The main objective was to determine the ozone volumetric mass transfer coefficient, kL a, in calm uniform section of the column, under different values of gas and liquid flow rates. Obtained values of these coefficients were compared with the values in countercurrent bubble column. The critical liquid flowrate, when gas hold up reaches its maximum, was experimentally determined. It was shown that the maximum value of the ozone volumetric mass transfer coefficient is obtained just when liquid flowrate is at its critical value.

Performance characteristics according to the radial position of gas distributor holes in a low-power cylindrical Hall thruster

2016 ◽  
Vol 23 (8) ◽  
pp. 083514 ◽  
Author(s):  
Yuanyuan Gao ◽  
Hui Liu ◽  
Peng Hu ◽  
Hongyan Huang ◽  
Daren Yu
Keyword(s):  
Low Power ◽  
Performance Characteristics ◽  
Hall Thruster ◽  
Radial Position ◽  
Gas Distributor
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