Comprehensive dynamic modelling and CFD simulation of heat and mass transfer in wetted wall absorption reactors

2014 ◽  
Vol 92 (10) ◽  
pp. 1749-1765 ◽  
Author(s):  
Seyyed Mohammad Hossein Hashemi Amrei ◽  
Saber Memardoost ◽  
Sima Asadi ◽  
Asghar Molaei Dehkordi
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Cfd Simulation ◽  
Dynamic Modelling

Experimental and Numerical Research on Steam Direct Contact Condensation Process in Automatic Depressurization System of AP1000

2020 ◽  
Author(s):  
Yuhao Zhang ◽  
Li Feng ◽  
Zhimin Qiu ◽  
Jingpin Fu ◽  
Daogang Lu
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Direct Contact ◽  
Cfd Simulation ◽  
Condensation Process ◽  
Validation Data ◽  
Numerical Work ◽  
Pressurized Water ◽  
Temperature And Pressure ◽  
Contact Condensation

Abstract In the third generation pressurized water reactor AP1000 plant, the Automatic Depressurization System (ADS) is one of the most important passive safety system. However, the steam Direct Contact Condensation (DCC) microscopic mechanisms are very complicated, which are not very clear yet. Moreover, the high-pressure and high-temperature experiment is very expensive to be conducted for many different test conditions. So in the present work, both the experimental and numerical methods are employed to investigate the steam DCC behavior. The steam DCC experimental bench has been built up, and the key parameters including the flow patterns and steam core temperature distributions are measured to provide validation data for the numerical results. In aspect of the numerical work, CFD simulation on the steam condensation is conducted. The heat and mass transfer process is simulated through the three-dimension commercial software FLUENT 16.0. Some of the key heat and mass transfer correlations are added by User Defined Function (UDF). The key parameters including the condensation steam fraction, temperature, and pressure, etc. are analyzed, which reflect the major heat transfer characteristics. According to the results, the expansion-compression-steam tail could be observed in both the numerical and experimental results. In essential, the steam fraction, temperature, and pressure distributions are determined by the equilibrium and transformation between the thermal dynamic energy and kinetic energy. The results provide working references for the practical ADS steam spraying condensation process in AP1000 reactor.

CFD Simulation of Hydrodynamics, Heat and Mass Transfer Simultaneously in Structured Packing

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
M.R. Khosravi Nikou ◽  
M.R. Ehsani ◽  
M. Davazdah Emami
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Pressure Drop ◽  
Heat And Mass Transfer ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Theoretical Plate ◽  
Absolute Relative Error ◽  
Gas Liquid Flow ◽  
Counter Current

This paper describes the results of computational fluid dynamic modeling of hydrodynamics, heat and mass transfer simultaneously in Flexipac 1Y operated under a counter-current gas-liquid flow condition. The simulation was performed for a binary mixture of methanol-isopropanol distillation. The pressure drop, the height of equivalent to theoretical plate (HETP) and temperature distribution across the column were calculated and compared with experimental data. The mean absolute relative error (MARE) between CFD predictions and experimental data for the pressure drop, HETP and temperature profile are 20.7%, 12.9% and 2.8%, respectively.

Heat and mass transfer dynamic modelling of an indirect biscuit baking tunnel-oven. Part I: Modelling principles

1992 ◽  
Vol 16 (3) ◽  
pp. 173-196 ◽  
Author(s):  
I. Savoye ◽  
G. Trystram ◽  
A. Duquenoy ◽  
P. Brunet ◽  
F. Marchin
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Dynamic Modelling

CFD Simulation of Human Coughs and Sneezes: A Study in Droplet Dispersion, Heat, and Mass Transfer

2010 ◽  
Author(s):  
Amir A. Aliabadi ◽  
Steven N. Rogak ◽  
Sheldon I. Green ◽  
Karen H. Bartlett
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Cfd Simulation ◽  
Near Field ◽  
Dynamics Simulation ◽  
Evaporation Process ◽  
Buoyancy Effect ◽  
Computational Fluid Dynamics Simulation ◽  
Droplet Dispersion ◽  
Ambient Relative Humidity

A Computational Fluid Dynamics simulation of near-field cough and sneeze droplet dispersion and heat and mass transfer is developed. In this study various sources of variability in cough and sneeze processes are considered. These are variations in injection volume (0.5l, 2.5l, and 5.0l) and ambient relative humidity (20%, 40% and 60%). There are a total of 9 simulations for coughs and sneezes in a quiescent background. A large ensemble (5000) of droplets are tracked with diameters in the range 1–500micron. Evaporation and dispersion are predicted as a function of droplet size. Generally, fine droplets evaporate faster than large droplets. Higher relative humidities slow the evaporation process. Larger droplets have greater axial penetration. They also exhibit greater vertical drop due to the effect of gravity. Sideway penetration is increased by higher injection volumes. The buoyancy effect due to thermal energy of the injection is very weak, at least for the 10-second computation duration.

3D-DEM-CFD simulation of heat and mass transfer, gas combustion and calcination in an intermittent operating lime shaft kiln

2017 ◽  
Vol 117 ◽  
pp. 121-135 ◽  
Author(s):  
Bastian Krause ◽  
Birk Liedmann ◽  
Jens Wiese ◽  
Patrick Bucher ◽  
Siegmar Wirtz ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Cfd Simulation ◽  
Gas Combustion ◽  
Shaft Kiln
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