Deposition of Nanosized Particles in Cylindrical Tubes Under Laminar and Turbulent Flow Conditions

Malet, J.; Alloul, L.; Michielsen, N.; Boulaud, D.; Renoux, A.

doi:10.1016/s0021-8502(99)00062-2

Cited by 18 publications

(13 citation statements)

References 15 publications

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“…In the lower Dean number cases as shown in Fig. 12 for De = 150 and 300, the results are in agreement with the theory of Friendlander [22] and the experimental results given by Malet et al [19]. The penetration efficiencies are higher in the case of higher Dean number than that of lower one.…”

Section: Relationship Between Penetration Efficiency and Schmidt Numbersupporting

confidence: 90%

“…For nanoparticles, the Stokes number is usually less than 10 À5 , diffusion instead of inertial is the main factor causing particles deposition [17][18]. Therefore, the effects of the flow property and particle property on the penetration efficiency can be integrated into the Schmidt number, Sc ¼ m=D (where m is the kinematic viscosity of fluid, D is the particle diffusion coefficient) [19][20]. Meanwhile, in the transport process, the changes in particle distribution over the cross-section will happen because of particle diffusion, coagulation and breakage.…”

Section: Introductionmentioning

confidence: 99%

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Distribution and penetration efficiency of nanoparticles between 8–550nm in pipe bends under laminar and turbulent flow conditions

Lin

Yin

Lin

et al. 2015

International Journal of Heat and Mass Transfer

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Section: Relationship Between Penetration Efficiency and Schmidt Numbersupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Distribution and penetration efficiency of nanoparticles between 8–550nm in pipe bends under laminar and turbulent flow conditions

Lin

Yin

Lin

et al. 2015

International Journal of Heat and Mass Transfer

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“…Measurement of aerosol from the top of a 10 m sampling tower poses significant difficulties, owing to effects such as Brownian coagulation and diffusion losses to the wall (Alonso et al, 1999;Malet et al, 2000). To minimise these effects, a specifically designed sampling stack drew aerosol down a 30 cm diameter plastic tube to laboratory level, where they were iso-kinetically sub-sampled into an 8 cm diameter stainless steel tube leading to the laboratory.…”

Section: Methodsmentioning

confidence: 99%

The characterisation of pollution aerosol in a changing photochemical environment

et al. 2006

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Abstract. Measurements are presented from a sampling location 50 km downwind of Greater London, UK, to investigate the timescales required for the atmospheric transformations of aerosol in urban emissions plumes in the context of photochemical age based on the benzene to toluene ratio. It is shown that particles at or around 100 nm in diameter exhibit the greatest systematic variability in chemical properties, and thus hygroscopic properties, on a timescale of 1-2 days. The smaller Aitken mode and larger accumulation mode particles exhibit less variability on these timescales, which we propose is as a result of their different residence times in the atmosphere. The larger accumulation particles have been in the atmosphere longer than the 100 nm particles and their chemistry and hygroscopic properties have been integrated over several days and potentially over several source regions. In contrast, the smaller Aitken mode particles show little systematic variability with photochemical age because their atmospheric lifetimes are short, thus chemical changes and hence changes in water affinity have not had time to occur. Increases in the particle diameter of up to 40% are observed at 90% relative humidity in the accumulation mode from the uptake of water as the particles become increasingly soluble in nature.

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“…We attribute this to neglecting ion losses in the calculation. Then, standard expressions of the ion depletion rate by diffusion to the walls in laminar (Maisels et al 2003) and turbulent (Malet et al 2000) flows in pipes were used for ω i in Equation (1a) and a new calculation was performed. Diffusional losses had a minor impact on model predictions, with respect to the calculation with no ion losses.…”

Section: Polydisperse Aerosolsmentioning

confidence: 99%

Single Charging of Nanoparticles by UV Photoionization at High Flow Rates

Hontañón

Kruis

2008

Aerosol Science and Technology

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The feasibility of UV photoionization for single unipolar charging of nanoparticles at flow rates up to 100 l·min −1 is demonstrated. The charging level of the aerosol particles can be varied by adjusting the intensity of the UV radiation. The suitability of a UV photocharger followed by a DMA to deliver monodisperse nanoparticles at high aerosol flow rates has been assessed experimentally in comparison to a radioactive bipolar charger ( 85 Kr, 10 mCi). Monodisperse aerosols with particle sizes in the range of 5 to 25 nm and number concentrations between 10 4 and 10 5 cm −3 have been obtained at flow rates up to 100 l·min −1 with the two aerosol chargers. In terms of output particle concentration, the UV photoionizer performs better than the radioactive ionizer with increasing aerosol flow rate. Aerosol charging in the UV photoionizer is described by means of a photoelectric charging model that relies on an empirical parameter and of a diffusion charging model based on the Fuchs theory. The UV photocharger behaved as a quasiunipolar charger for polydisperse aerosols with particles sizes less than 30 nm and number concentrations ∼10 7 cm −3 . Much reduced diffusion charging was observed in the experiments, with respect to the calculations, likely due to ion losses onto the walls caused by unsteady electric fields in the irradiation region.

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Deposition of Nanosized Particles in Cylindrical Tubes Under Laminar and Turbulent Flow Conditions

Cited by 18 publications

References 15 publications

Distribution and penetration efficiency of nanoparticles between 8–550nm in pipe bends under laminar and turbulent flow conditions

Distribution and penetration efficiency of nanoparticles between 8–550nm in pipe bends under laminar and turbulent flow conditions

The characterisation of pollution aerosol in a changing photochemical environment

Single Charging of Nanoparticles by UV Photoionization at High Flow Rates

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