The impact of atmospheric boundary layer, opening configuration and presence of animals on the ventilation of a cattle barn

0524010 - ÚT 2021 RIV NL eng J - Journal Article
Nosek, Štěpán - Kluková, Zuzana - Jakubcová, Michala - Qianying, Y. - Janke, D. - Demeyer, P. - Jaňour, Zbyněk
The impact of atmospheric boundary layer, opening configuration and presence of animals on the ventilation of a cattle barn.
Journal of Wind Engineering and Industrial Aerodynamics. Roč. 201, June (2020), č. článku 104185. ISSN 0167-6105. E-ISSN 1872-8197
R&D Projects: GA MŠMT(CZ) LTC18070
Institutional support: RVO:61388998
Keywords : air pollution * atmospheric boundary layer * livestock building * natural ventilation * OPD * TR-PIV * wind tunnel
OECD category: Meteorology and atmospheric sciences
Impact factor: 4.082, year: 2020
Method of publishing: Limited access
https://www.journals.elsevier.com/journal-of-wind-engineering-and-industrial-aerodynamics

Naturally ventilated livestock buildings (NVLB) represent one of the most significant sources of ammonia emissions. However, even the dispersion of passive gas in an NVLB is still not well understood. In this paper, we present a detailed investigation of passive pollutant dispersion in a model of a cattle barn using the wind tunnel experiment method. We simulated the pollution of the barn by a ground-level planar source. We used the time-resolved particle image velocimetry (TR-PIV) and the fast flame ionisation detector (FFID) to study the flow and dispersion processes at high spatial and temporal resolution. We employed the Proper Orthogonal Decomposition (POD) and Oscillating Patterns Decomposition (OPD) methods to detect the coherent structures of the flow. The results show that the type of atmospheric boundary layer (ABL) and sidewall opening height have a significant impact on the pollutant dispersion in the barn, while the presence of animals and doors openings are insignificant under conditions of winds perpendicular to the sidewall openings. We found that the dynamic coherent structures, developed by the Kelvin-Helmholtz instability, contribute to the pollutant transport in the barn. We demonstrate that in any of the studied cases the pollutant was not well mixed within the barn and that a significant underestimation (up to by a factor 3) of the barn ventilation might be obtained using, e.g. tracer gas method.
Permanent Link: http://hdl.handle.net/11104/0310986