Deposition of particle pollution in turbulent forced-air cooling
نویسندگان
چکیده
Rotating fans are the prevalent forced cooling method for heat generating equipment and buildings. As concentration of atmospheric pollutants has increased, accumulation microscale nanoscale particles on surfaces due to advection-diffusion led adverse mechanical, chemical electrical effects that increase demands reduce reliability electronic equipment. Here, we uncover mechanisms leading enhanced deposition particle matter (PM$_{10}$ PM$_{2.5}$) turbulent axial fan flows operating at Reynolds numbers, $Re \sim 10^5$. Qualitative observations long-term from field were combined with \textit{in situ} image velocimetry a telecommunications base station, revealing dominant role impingement velocity angle. Near-wall momentum transport $10 < y^+ 50$ explored using quadrant analysis contributions events promote through diffusion eddy impaction. By decomposing these events, local behaviour fine bulk flow surface been categorised. The transition clean was accompanied by decrease in shear velocity, stresses, sweep motions lower flux wall-normal direction. Finally, insights, selective filtering coarse found conditions enhance matter.
منابع مشابه
effect of sub-grid scales on large eddy simulation of particle deposition in a turbulent channel flow
چکیده ندارد.
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ژورنال
عنوان ژورنال: Aerosol Science and Technology
سال: 2021
ISSN: ['1521-7388', '0278-6826']
DOI: https://doi.org/10.1080/02786826.2021.1873237