Investigation of the Effect of Ventilation System Inlet Location on Particle Motion in a Room Using Multi Relaxation Time-Lattice Boltzmann Method

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, University of Bojnord

2 Department of Mechanical Engineering

3 Clarkson University

Abstract

In this work multi-relaxation time lattice Boltzmann method is used to investigate the effect of the inlet air location on particle motion in a room. The scaled modeled room is one-tenth scale of a full-size room with dimensions of 0.914 m × 0.305 m × 0.457 m.  For an inlet air with dimension of 0.101 m×0.101 m, two locations (ceiling and floor) are studied.  The large Eddy simulation with the standard Smagorinsky model is utilized to simulate the turbulent indoor airflow. Particles with 1 and 10 micrometer sizes are selected for investigation of particle dispersion and deposition in the room. The simulation results for number of deposited particles and those exiting the room show that when the inlet air is on the floor, the number of larger 10 µm particles leaving through the exhaust register is more than the case for inlet on the ceiling. For smaller 1 µm particles, however, no significant difference between the floor and ceiling inlet air for particles leaving the room thought the exhaust register was seen.  The present results also show that the gravity significantly affects the particle deposition, and the number of deposited 10 µm particles on the floor are about 100 times that of the deposited 1 µm particles when the inlet air is at ceiling.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 3
June 2021
Pages 1457-1468

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