Performance assessment for locally balanced and wall-return turbulent clean rooms by the stochastic particle tracking model
Authors
Citation
International journal on architectural science, v.3, no.4, 2002, pp. 146-162
Abstract
This study analyzes, simulates, and compares two types of turbulent clean rooms, by computational fluid dynamics analysis. This dimensions of the clean room models are 7.8m (L) X 7.8m (W) X 2.7m (H). The fluent flow solver with the k-e two-equation turbulence model was used to calculate the turbulent flows. In addition to solving transport equations for the continuous phase (air), a discrete phase model in a Lagrangian frame of reference was used to evaluate and statistically analyze trajectories of sub-micro particles in the clean rooms. The stochastic tracking model was applied to predict the dispersion of particles due to turbulence of airflow. The wall-return type turbulent clean room is less able to exhaust particles than the locally balanced type. Particles generated close to an exhaust air opening are more effectively exhausted from the clean room.
(1) Introduction
(2) Previous studies
(3) Mathematical model
(4) Simulation analysis
(a) Basic assumptions
(b) Boundary conditions
(c) Room models
(d) Mesh system
(e) Case setup
(5) Results and discussion
(a) Verification of predicted airflow patterns
(b) Comparison of the number particles released
(c) Effect of changing layout of exhaust openings
(d) Effect of an obstacle
(e) Effect of changing position of particle injections
(6) Conclusions
(7) References
Description
Notes: Ventilation
Subject
Type
Article
Format
Date
2002
Language
en