Penetration of sub-micron aerosol droplets in composite cylindrical filtration elements
| Autor: | Regina Stabbert, Markus Nordlund, Steffen Stolz, Bernardus J. Geurts, Pascal Pratte, Christoph Winkelmann, Valerie Poux |
|---|---|
| Přispěvatelé: | Fluids and Flows |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Fluid Flow and Transfer Processes
Heterogeneous filtration Materials science METIS-277483 Mechanical Engineering Composite number Laminar flow Penetration (firestop) Péclet number Mechanics Condensed Matter Physics Hagen–Poiseuille equation Penetration IR-77624 Volumetric flow rate Poiseuille flow Physics::Fluid Dynamics symbols.namesake Classical mechanics symbols Advection–diffusion EWI-19238 Cylindrical coordinate system Convection–diffusion equation Filtration |
| Zdroj: | International journal of heat and fluid flow, 32(1), 261-272. Elsevier International Journal of Heat and Fluid Flow, 32(1), 261-272. Elsevier |
| ISSN: | 1879-2278 0142-727X |
| Popis: | Advection–diffusion transport of aerosol droplets in composite cylindrical filtration elements is analyzed and compared to experimental data. The penetration, characterizing the fraction of droplets that passes through the pores of a filtration element, is quantified for a range of flow rates. The advection–diffusion transport in a laminar Poiseuille flow is treated numerically for slender pores using a finite difference approach in cylindrical coordinates. The algebraic dependence of the penetration on the Peclet number as predicted theoretically, is confirmed by experimental findings at a variety of aspect ratios of the cylindrical pores. The effective penetration associated with a composite filtration element consisting of a set of parallel cylindrical pores is derived. The overall penetration of heterogeneous composite filtration elements shows an algebraic dependence to the fourth power on the radii of the individual pores that are contained. This gives rise to strong variations in the overall penetration in cases with uneven distributions of pore sizes, highly favoring filtration by the larger pores. The overall penetration is computed for a number of basic geometries, providing a point of reference for filtration design and experimental verification. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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