Numerical simulation of smoke natural filling in ultra-thin and tall atrium

• Main Authors: Jiuzhu Wang, Cuifeng Du, Hao Zhang
• Format: Article
• Language: English
• Published: Elsevier 2021-12-01
• Series: Case Studies in Thermal Engineering
• Subjects: Ultra-thin and tall atrium; Axial plume velocity; Axial plume temperature rise; Influencing factor
• Online Access: http://www.sciencedirect.com/science/article/pii/S2214157X21006845

In this paper, the natural filling law of smoke in ultra-thin and tall atrium was studied by means of numerical simulations. The results show that, the axial plume velocity of the ultra-thin and tall atrium has a good exponential function dependence on the Q˙1/3z−1/3, and the axial plume temperature rise has a good power function dependence on the Q˙2/3z−5/3. When the cross-sectional shape is circle, the plume moves faster, while the cross-sectional shape has little effect on the axial plume temperature rise far from the fire source. Area-height-squared ratio (A/H2) has a little influence on the axial plume velocity in the atrium for A/H2<0.06. The axial plume temperature rise increases with the increase of the A/H2 when the height (z) is lower than 20 m, while the axial plume temperature rise decreases with the increase of the area-height-squared ratio at z > 30 m.