TY  - EJOU
AU  - Wang, Fei 
AU  - Meng, Qinpeng 
AU  - Zhao, Jinchi 
AU  - Wang, Xin 
AU  - Liu, Yuhong 
AU  - Zhang, Qianru 

TI  - The Turbulent Schmidt Number for Transient Contaminant Dispersion in a Large Ventilated Room Using a Realizable k-<i>ε</i> Model
T2  - Fluid Dynamics \& Materials Processing

PY  - 2024
VL  - 20
IS  - 4
SN  - 1555-2578

AB  - Buildings with large open spaces in which chemicals are handled are often exposed to the risk of explosions. Computational fluid dynamics is a useful and convenient way to investigate contaminant dispersion in such large spaces. The turbulent Schmidt number (<i>Sc</i><sub><i>t</i></sub>) concept has typically been used in this regard, and most studies have adopted a default value. We studied the concentration distribution for sulfur hexafluoride (SF<sub>6</sub>) assuming different emission rates and considering the effect of <i>Sc</i><sub><i>t</i></sub>. Then we examined the same problem for a light gas by assuming hydrogen gas (H<sub>2</sub>) as the contaminant. When SF<sub>6</sub> was considered as the contaminant gas, a variation in the emission rate completely changed the concentration distribution. When the emission rate was low, the gravitational effect did not take place. For both low and high emission rates, an increase in <i>Sc</i><sub><i>t</i></sub> accelerated the transport rate of SF<sub>6</sub>. In contrast, for H<sub>2</sub> as the contaminant gas, a larger <i>Sc</i><sub><i>t</i></sub> could induce a decrease in the H<sub>2</sub> transport rate.
KW  - Large space; CFD; turbulent Schmidt number; contaminant dispersion; emission rate

DO  - 10.32604/fdmp.2023.026917