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Paper Information

Journal:   JOURNAL OF APPLIED FLUID MECHANICS (JAFM)   2016 , Volume 9 , Number 4; Page(s) 1945 To 1953.
 
Paper: 

PREDICTION OF CO CONCENTRATION AND MAXIMUM SMOKE TEMPERATURE BENEATH CEILING IN TUNNEL FIRE WITH DIFFERENT ASPECT RATIO

 
 
Author(s):  GANNOUNI S.*, BEN MAAD R.
 
* FACULTY OF SCIENCES OF TUNIS, DEPARTMENT OF PHYSICS, LABORATORY OF ENERGIZING AND THERMAL AND MASS TRANSFER, 2092 ELMANAR, TUNIS, TUNISIA
 
Abstract: 

In a tunnel fire, the production of smoke and toxic gases remains the principal prejudicial factors to users. The heat is not considered as a major direct danger to users since temperatures up to man level do not reach tenable situations that after a relatively long time except near the fire source. However, the temperatures under ceiling can exceed the thresholds conditions and can thus cause structural collapse of infrastructure.
This paper presents a numerical analysis of smoke hazard in tunnel fires with different aspect ratio by large eddy simulation. Results show that the CO concentration increases as the aspect ratio decreases and decreases with the longitudinal ventilation velocity. CFD predicted maximum smoke temperatures are compared to the calculated values using the model of Liet al. and then compared with those given by the empirical equation proposed by kuriokaet al. A reasonable good agreement has been obtained. The backlayering length decreases as the ventilation velocity increases and this decrease fell into good exponential decay. The dimensionless interface height and the region of bad visibility increases with the aspect ratio of the tunnel cross-sectional geometry.

 
Keyword(s): TUNNEL FIRE, SMOKE HAZARD, CO CONCENTRATION, MAXIMUM SMOKE TEMPERATURE, ASPECT RATIO, CFD
 
 
References: 
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Click to Cite.
APA: Copy

GANNOUNI, S., & BEN MAAD, R. (2016). PREDICTION OF CO CONCENTRATION AND MAXIMUM SMOKE TEMPERATURE BENEATH CEILING IN TUNNEL FIRE WITH DIFFERENT ASPECT RATIO. JOURNAL OF APPLIED FLUID MECHANICS (JAFM), 9(4), 1945-1953. https://www.sid.ir/en/journal/ViewPaper.aspx?id=570812



Vancouver: Copy

GANNOUNI S., BEN MAAD R.. PREDICTION OF CO CONCENTRATION AND MAXIMUM SMOKE TEMPERATURE BENEATH CEILING IN TUNNEL FIRE WITH DIFFERENT ASPECT RATIO. JOURNAL OF APPLIED FLUID MECHANICS (JAFM). 2016 [cited 2021May09];9(4):1945-1953. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=570812



IEEE: Copy

GANNOUNI, S., BEN MAAD, R., 2016. PREDICTION OF CO CONCENTRATION AND MAXIMUM SMOKE TEMPERATURE BENEATH CEILING IN TUNNEL FIRE WITH DIFFERENT ASPECT RATIO. JOURNAL OF APPLIED FLUID MECHANICS (JAFM), [online] 9(4), pp.1945-1953. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=570812.



 
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