Flow characterization of various singularities in a real-scale ventilation network with rectangular ducts

In the literature, studies on aerosol deposition in ventilation ducts mainly focus on ventilation ducts with a hydraulic diameter (Dh) of around 15 to 25 cm and with circular or square cross-sections. However, to our knowledge, common industrial-sized ventilation ducts (Dh ~ 50 cm) with rectangular cross-sections have not been studied. As a result, experimental aerosol deposition measurement protocols relative to ventilation ducts of smaller sizes are not suitable for measurement in industrial-sized ducts. Therefore, a new experimental protocol is proposed here, which can be used without destruction of the surface or addition of a substrate on the duct surface and could be applied in industrial ventilation networks as soon as certain conditions are met. In this paper, we present an experimental protocol developed to measure aerosol deposition adapted for large-scale ventilation ducts. First, the collection and measurement technique, the type of aerosol and the injection method are chosen. Second, the experimental protocol relative to the collection of aerosols deposited on duct surfaces is developed, based on a so-called “wiping” technique. Many verifications are presented here to ensure repeatable and reproducible measurements. Third, a repeatability study is conducted, as well as a validation process. In the last section of this paper,we present some results on aerosol deposition obtained on a test facility compared to two other studies.

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“…Nondimensionalized profiles are presented in figure 13(b). The air speed profiles are repeatable and self-similar [17]…”

Section: Aerosol Dilution In the Facilitymentioning

confidence: 85%

An experimental protocol for measuring aerosol deposition in industrial-sized ventilation ducts

Costa¹,

Malet²,

Gehin³

2022

Meas. Sci. Technol.

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“…This size of aerosol is in the range of respirable aerosols. In addition, in nuclear buildings and plants, the transfer of these aerosols droplets within ventilation ducts can lead to local accumulation of radioactive material by aerosols deposition in ducts, implying a radiological risk during maintenance operations ( (Malet et al, 2022)). This droplets aerosols can also damage the filter media in the ventilation systems and cause a loss of tightness of the radioactive containment barrier ( (Lecoq et al, 2022)).…”

Section: Mass Size Distribution Of Aerosolized Secondary Dropletsmentioning

confidence: 99%