Identification of mass-transfer parameters and process simulation of SCP production process in airlift tower reactors with an external loop

1982 ◽  
Vol 24 (4) ◽  
pp. 817-835 ◽  
Author(s):  
R. Luttmann ◽  
H. Buchholz ◽  
W. Zakrzewski ◽  
K. Schügerl
Keyword(s):  
Mass Transfer ◽  
Production Process ◽  
Process Simulation ◽  
External Loop ◽  
Transfer Parameters

Validity of the Use of the Mass Transfer Parameters Obtained with 1D Column in 3D Systems during Soil Vapor Extraction

2016 ◽  
Vol 142 (6) ◽  
pp. 04016018 ◽  
Author(s):  
Otmane Boudouch ◽  
Daoud Esrael ◽  
Mariem Kacem ◽  
Belkacem Benadda ◽  
Rémy Gourdon
Keyword(s):  
Mass Transfer ◽  
Soil Vapor Extraction ◽  
Vapor Extraction ◽  
Transfer Parameters

scholarly journals Numerical study of the hydrodynamics and mass transfer in the external loop airlift reactor

2021 ◽  
pp. 34-34
Author(s):  
Predrag Kojic ◽  
Jovana Kojic ◽  
Milada Pezo ◽  
Jelena Krulj ◽  
Lato Pezo ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Airlift Reactor ◽  
Volumetric Mass Transfer Coefficient ◽  
Cfd Model ◽  
Gas Velocity ◽  
Liquid Mass ◽  
External Loop ◽  
Liquid Mass Transfer

The objective of this study was to investigate the hydrodynamics and the gas-liquid mass transfer coefficient of an external-loop airlift reactor (ELAR). The ELAR was operated in three cases: different inlet velocities of fluids, different alcohols solutions (water, 0.5% methanol, 0.5% ethanol, 0.5% propanol and 0.5% butanol) and different concentration of methanol in solutions (0%, 0.5%, 1%, 2% and 5%). The influence of superficial gas velocity and various diluted alcohol solutions on hydrodynamics and gas-liquid mass transfer coefficient of the ELAR was studied. Experimentally, the gas hold-up, liquid velocities and volumetric mass transfer coefficient values in the riser and the downcomer were obtained from the literature source. A computational fluid dynamics (CFD) model was developed, based on two-phase flow, investigating different liquids regarding surface tension, assuming the ideal gas flow, applying the finite volume method and Eulerian-Eulerian model. The volumetric mass transfer coefficient was determined using CFD model, as well as artificial neural network model. The effects of liquid parameters and gas velocity on the characteristics of the gas-liquid mass transfer were simulated. These models were compared with appropriate experimental results. CFD model successfully succeed to simulate the influence of different alcohols regarding the number of C-atoms on hydrodynamics and mass transfer.

scholarly journals Freeze-Drying Kinetics Approach of Soluble Coffee. Mass Transfer Parameters Estimation

2017 ◽  
Vol 62 (1) ◽  
pp. 7-17
Author(s):  
Adina Ghirişan ◽  
◽  
Simion Drăgan ◽  
Vasile Miclăuş ◽  
◽  
...  
Keyword(s):  
Mass Transfer ◽  
Freeze Drying ◽  
Drying Kinetics ◽  
Parameters Estimation ◽  
Transfer Parameters ◽  
Soluble Coffee

The Peculiarities of Mass Transfer in the Surface Layer of Materials under Extreme Heating

2021 ◽  
Vol 1037 ◽  
pp. 449-456
Author(s):  
Andrey V. Brover ◽  
Galina I. Brover ◽  
Olga B. Moysova ◽  
Valeriya E. Yankovskaya
Keyword(s):  
Crystal Structure ◽  
Mass Transfer ◽  
Plastic Deformation ◽  
Laser Heating ◽  
Alloying Elements ◽  
Simultaneous Action ◽  
Surface Layers ◽  
Linear Defects ◽  
Transfer Parameters ◽  
Local Plastic Deformation

Possible causes of mass transfer acceleration of carbon atoms and alloying elements in the surface layers of steels and alloys under extreme heating, under pulsing laser irradiation in particular, are considered. The research shows that the anomaly accelerated mass transfer, including diffusion in particular, in steels and alloys under fast laser heating has a cooperative character and is a result of a simultaneous action of several processes of different physics. It is proved that the carbon atoms mass transfer parameters and alloying elements depend on the scale and the level of emerging tension, relaxation of which goes along with a local plastic deformation, and occurrence of increased number of linear defects in crystal structure.

Multi-objective optimization of a biodiesel production process using process simulation

2020 ◽  
Vol 270 ◽  
pp. 122322
Author(s):  
Paula Ciribeli Gonçalves ◽  
Luciane Pimentel Costa Monteiro ◽  
Lizandro de Sousa Santos
Keyword(s):  
Production Process ◽  
Process Simulation ◽  
Biodiesel Production ◽  
Multi Objective Optimization ◽  
Multi Objective
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