کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6315292 1619159 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Computational fluid dynamics (CFD) simulation of a newly designed passive particle sampler
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Computational fluid dynamics (CFD) simulation of a newly designed passive particle sampler
چکیده انگلیسی


- Particle deposition to the Pas-DD sampler increases as wind speed and particle size increase and varies with angle of attack.
- Deposition velocities were in general agreement with experimental measurements.
- Particle deposition velocity was dependent on the geometry of the sampler.

In this work a series of computational fluid dynamics (CFD) simulations were performed to predict the deposition of particles on a newly designed passive dry deposition (Pas-DD) sampler. The sampler uses a parallel plate design and a conventional polyurethane foam (PUF) disk as the deposition surface. The deposition of particles with sizes between 0.5 and 10 μm was investigated for two different geometries of the Pas-DD sampler for different wind speeds and various angles of attack. To evaluate the mean flow field, the k-ɛ turbulence model was used and turbulent fluctuating velocities were generated using the discrete random walk (DRW) model. The CFD software ANSYS-FLUENT was used for performing the numerical simulations. It was found that the deposition velocity increased with particle size or wind speed. The modeled deposition velocities were in general agreement with the experimental measurements and they increased when flow entered the sampler with a non-zero angle of attack. The particle-size dependent deposition velocity was also dependent on the geometry of the leading edge of the sampler; deposition velocities were more dependent on particle size and wind speeds for the sampler without the bend in the leading edge of the deposition plate, compared to a flat plate design. Foam roughness was also found to have a small impact on particle deposition.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 214, July 2016, Pages 410-418
نویسندگان
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