Extended Analytical Turbulent Diffusion Model for Particle Dispersion and Deposition in a Horizontal Pipe: Comparison with CFD Simulation |
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Authors: | Alamgir Hossain Jamal Naser Monzur Imteaz |
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Institution: | (1) Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Melbourne, VIC, 3122, Australia; |
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Abstract: | A 2D analytical turbulent diffusion model for particle dispersion and deposition at different heights along the pipe flow
and circumferential deposition has been developed. This liquid–solid turbulent diffusion model presented in this paper has
emanated from an existing gas–liquid turbulent diffusion model. This model can be used as a handy tool for quick estimation
one and two-dimensional deposition fluxes of particles in water distribution networks. A comprehensive 3D numerical investigation
has been carried out using multiphase mixture model available in “Fluent 6.2” to verify the above analytical model. Different
particles sizes and densities were used for 3D numerical investigations. The deposition was studied as a function of particle
diameter, density, and fluid velocity. The deposition of particles, along the periphery of the pipe wall and at different
depths, was investigated. Both the models findings matched with qualitative phenomena such as deposition of heavier particles
at the bottom of the pipe wall were higher at lower velocities and lower at higher velocities. The lighter particles were
found mostly suspended with homogeneous distribution. Smaller particles were also suspended with marginal higher concentration
near the bottom of the pipe wall. This marginal higher concentration of the smaller particles was found to be slightly pronounced
for lower velocity. These analogies of particles are well discussed with the ratio between free-flight velocity and the gravitational
settling velocity. Extended analytical model results were compared with the 3D computational fluid dynamics simulation results.
Discrepancies in the model results were discussed. |
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