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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
The ventilation duct shape influence on the particle deposition in a 90° bend
Submission Author:
Marcos Batistella Lopes , PR
Co-Authors:
Marcos Batistella Lopes, Diego Barreto Pedroso Simões, Viviana Mariani
Presenter: Marcos Batistella Lopes
doi://10.26678/ABCM.ENCIT2020.CIT20-0143
Abstract
This study performs numerical modelling using the Eulerian-Lagrangian method to study the influence of the duct cross-section on deposition rates for the monodisperse and dilute air-particle flow in a 90° duct bend. First, the airflow with a Reynolds number of 40,000 through a square 90° duct bend with the hydraulic diameter of 0.08m and the curvature ratio of 4 was validated against the literature applying the SST k-ω eddy-viscosity model. Then, the square duct bend airflow field was compared in terms of the mean velocity and the turbulent kinetic energy with a circular duct operating with the same flow conditions. Finally, the particle deposition rates on the circular and square duct bend for the particle size between 0.1μm and 100μm comparing with the correlations from literature. The deposition rates were higher on the circular duct bend than the square duct bend for the Stokes number ranging from 0.4 to 3.0.
Keywords
airflow, duct bend, Particle Deposition, Eulerian-Lagrangian method
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