Enhanced soiling on the wall/ceiling around a diffuser due to particle deposition is very unsightly and reduces our quality of life. This study aimed to model the particle deposition on the surfaces around multi-slot diffusers, which are widely used in transportation vehicles. An SST k-ω model with a modified Lagrangian method was proposed and validated with experimental data on particle deposi...

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1. Although ventilation in normal human lungs has been shown to decrease from apex to base, comparable observations are lacking in regard to particle deposition. 2. We compared regional ventilation and particle deposition in normal subjects by using radioactive xenon and a radioactive aerosol while sitting, lying, and while breathing at an increased rate. Both smokers and non-smokers were studi...

Because the initial deposition pattern of inhaled particles of various toxic agents determines their future clearance and insult to tissue, respiratory tract deposition is important in assessing the potential toxicity of inhaled aerosols. Factors influencing the deposition of inhaled particles can be classified into three main areas: (1) the physics of aerosols, (2) the anatomy of the respirato...

this paper is concerned with asphaltene deposition in fluid flowing through pipelines. brownian diffusion and drag, gravitational, thermophoresis, buoyancy, and shear removal are considered as possible mechanisms in the asphaltene deposition process. the thermo-physical properties of the fluid were obtained from iranian oil fields. a model was used in the pipeline deposition modeling to predict...

Deposition of colloidal- and nano-scale particles on surfaces is critical to numerous natural and engineered environmental, health, and industrial applications ranging from drinking water treatment to semi-conductor manufacturing. Nano-scale surface roughness-induced hydrodynamic impacts on particle deposition were evaluated in the absence of an energy barrier to deposition in a parallel plate ...

The size of a particle determines the deposition efficiency, as well as its deposition site. In this paper, different modelling techniques are presented for submicron and micron particles in a human nasal cavity. In addition this paper highlights some deficiencies in the default models available in a commercially available CFD software.For submicron particles the default Fluent Brownian model a...

Ambient air particles in the ultrafine size range (diameter < 100 nm) may contribute to the health effects of particulate matter. However, there are few data on ultrafine particle deposition during spontaneous breathing, and none in people with asthma. Sixteen subjects with mild to moderate asthma were exposed for 2 hr, by mouthpiece, to ultrafine carbon particles with a count median diameter (...

Particle inhalation from the ambient environment and particle deposition in the respiratory tracts are numerically investigated using an integrated breathing human manikin which includes detailed facial features as well as nasal cavity, laryngopharynx and trachea. Visualized and quantitative results including the airflow field, particle tracks and particle inhalation and deposition patterns are...

Regional deposition of particles in an image-based airway model: Cfd simulation and left-right lung ventilation asymmetry. who were always willing to lend a helping hand and share their thoughts with me. I would also like to thank Dr. Merryn Tawhai and Dr. Eric Hoffman, whose cross-disciplinary work on this project made this study possible. Figure A6: Overall deposition efficiency vs. (a) parti...