Assessing effect of wind tunnel sizes on air velocity and concentration boundary layers and on ammonia emission estimation using computational fluid dynamics (CFD)

The objective of this study was to investigate the effect of different geometric sizes of wind tunnels on aerial boundary layers above the emission surface and therefore their effect on ammonia emission using CFD tool. Five wind tunnels of different sizes were used for the CFD simulation. Detail exp...

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Bibliographic Details
Published in:Computers and electronics in agriculture 2011-08, Vol.78 (1), p.49-60
Main Authors: Saha, Chayan Kumer, Wu, Wentao, Zhang, Guoqiang, Bjerg, Bjarne
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
air
Ammonia
Ammonia emission
ammonium nitrogen
Biological and medical sciences
Boundary layer
Boundary layer thickness
CFD simulation
Computational fluid dynamics
Computer simulation
Emission analysis
equations
Fundamental and applied biological sciences. Psychology
Mass transfer
Mathematical models
Wind tunnel size
Wind tunnels
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Summary:The objective of this study was to investigate the effect of different geometric sizes of wind tunnels on aerial boundary layers above the emission surface and therefore their effect on ammonia emission using CFD tool. Five wind tunnels of different sizes were used for the CFD simulation. Detail experimental measurements on air velocity and concentration profiles above the emission surface were realised using average inlet velocities of 0.1, 0.2, 0.3, and 0.4ms⁻¹ in two wind tunnels under isothermal condition. The TAN (Total Ammoniacal Nitrogen) and pH of ammonia aqueous solution were kept constant during the experiments. The boundary conditions necessary for the CFD study were obtained from the measured experimental data. The CFD model used for simulations was first validated using the data from the two wind tunnel experiments. For assessing the effects of wind tunnel size, the air velocity range of 0.1-0.6ms⁻¹ was used in CFD investigations. It was found that the velocity and concentration boundary layer thickness decreased with the increase of inlet air velocity where the concentration boundary was thinner than the corresponding velocity boundary layer. Wind tunnel sizes affected both velocity and concentration boundary layer thicknesses (P
ISSN:0168-1699
1872-7107
DOI:10.1016/j.compag.2011.05.011