Aerosol deposition in a pipe with turbulent airflow

Montgomery, Thomas L.; Corn, Morton

doi:10.1016/0021-8502(70)90034-0

Cited by 74 publications

(22 citation statements)

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“…When the surface roughness is high, the deposition by interception mechanism becomes more effective. The increase of particle deposition with surface roughness in duct flows was observed experimentally by Montgomery and Corn [53] and in the computer simulations of Fan and Ahmadi [54] and Li and Ahmadi [55]. Therefore, it is conjectured that the difference between the present simulation results and the experimental data of Kelly et al [51] is due to the roughness in the nasal cavity replica in the experimental work.…”

Section: Particle Depositionsupporting

confidence: 33%

Numerical simulation of airflow and micro-particle deposition in human nasal airway pre- and post-virtual sphenoidotomy surgery

Bahmanzadeh¹,

Abouali²,

Faramarzi³

et al. 2015

Computers in Biology and Medicine

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Section: Particle Depositionsupporting

confidence: 33%

Numerical simulation of airflow and micro-particle deposition in human nasal airway pre- and post-virtual sphenoidotomy surgery

Bahmanzadeh¹,

Abouali²,

Faramarzi³

et al. 2015

Computers in Biology and Medicine

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“…All such data are presented in Figure 2.7. The deposition surface in all of these experiments was the floor of a horizontal duct, except in the case of Montgomery & Corn (1970) where the internal perimeter of a round horizontal duct was the deposition surface. The data collected by Kvasnak et al (1993) for irregularly shaped particles flowing through a 15 cm wide and 2.5 cm high duct are included even though the hydraulic diameter of this duct is somewhat smaller than the others.…”

Section: Relevance Of Current Data To Deposition In Ventilation Ductsmentioning

confidence: 99%

Particle deposition in ventilation ducts

Sippola¹

2002

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Exposure to airborne particles is detrimental to human health and indoor exposures dominate total exposures for most people. The accidental or intentional release of aerosolized chemical and biological agents within or near a building can lead to exposures of building occupants to hazardous agents and costly building remediation.Particle deposition in heating, ventilation and air-conditioning (HVAC) systems may significantly influence exposures to particles indoors, diminish HVAC performance and lead to secondary pollutant release within buildings. This dissertation advances the understanding of particle behavior in HVAC systems and the fates of indoor particles by means of experiments and modeling.Laboratory experiments were conducted to quantify particle deposition rates in horizontal ventilation ducts using real HVAC materials. Particle deposition experiments were conducted in steel and internally insulated ducts at air speeds typically found in ventilation ducts, 2-9 m/s. Behaviors of monodisperse particles with diameters in the size range 1-16 µm were investigated. Deposition rates were measured in straight ducts with 1 2 a fully developed turbulent flow profile, straight ducts with a developing turbulent flow profile, in duct bends and at S-connector pieces located at duct junctions. In straight ducts with fully developed turbulence, experiments showed deposition rates to be highest at duct floors, intermediate at duct walls, and lowest at duct ceilings. Deposition rates to a given surface increased with an increase in particle size or air speed. Deposition was much higher in internally insulated ducts than in uninsulated steel ducts. In most cases, deposition in straight ducts with developing turbulence, in duct bends and at S-connectors at duct junctions was higher than in straight ducts with fully developed turbulence.Measured deposition rates were generally higher than predicted by published models.A model incorporating empirical equations based on the experimental measurements was applied to evaluate particle losses in supply and return duct runs. Model results suggest that duct losses are negligible for particle sizes less than 1 µm and complete for particle sizes greater than 50 µm. Deposition to insulated ducts, horizontal duct floors and bends are predicted to control losses in duct systems. When combined with models for HVAC filtration and deposition to indoor surfaces to predict the ultimate fates of particles within buildings, these results suggest that ventilation ducts play only a small role in determining indoor particle concentrations, especially when HVAC filtration is present.However, the measured and modeled particle deposition rates are expected to be important for ventilation system contamination. ChairDate

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“…16 and are reasonably close to Beal's theory. The concept of effective particle diffusivity overestimates the experimental data when T + _< 2.0 [48].…”

mentioning

confidence: 86%

Sub-micron particle deposition on an isothermal horizontal rod in a turbulent flow system

Chiou

2000

Acta Mechanica

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Summary. The available theoretical models for particulate fouling were reviewed and used to explain some of limited fouling data which have been reported. An experimental measurement of the thermophoretic deposition of sub-micron particles on the smooth wall of a circular rod and a simple approximation of a two-dimensional method for predicting the thermophoretic effects on sub-micron particles are introduced. The particles were moving under fully developed turbulent flow conditions, and the investigation focusses on diffusive deposition of sub-micron particles of dp = 0.05 #m and dp = 0.25 #m in diameter.

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Aerosol deposition in a pipe with turbulent airflow

Cited by 74 publications

References 10 publications

Numerical simulation of airflow and micro-particle deposition in human nasal airway pre- and post-virtual sphenoidotomy surgery

Numerical simulation of airflow and micro-particle deposition in human nasal airway pre- and post-virtual sphenoidotomy surgery

Particle deposition in ventilation ducts

Sub-micron particle deposition on an isothermal horizontal rod in a turbulent flow system

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