Research

Forensic analysis of a fatal fire incident

In 2010, I witnessed a tragic fire incident in my neighbourhood, in which seven people from the same family, including a boy from my school lost their lives due to asphyxiation. The official investigation report identified teak wood to be the main source of fatal Carbon Monoxide. 8 years later, my analysis with the help of Fire Dynamics Simulator has revealed that teak wood alone cannot produce enough CO, rather it is the presence of some other fuel with high CO yield, such as turpentine oil,that may explain the availability of high amount of toxic gas. I have also showed that the victims of casualty were entrapped by the smoke within the main staircase due to a drop in the tenability which caused the fatality . The use of engineering analysis and modelling of fire for fire forensic analysis is considered to be an important tool in fire investigation, this paper reports first such study in Bangladesh.

Fire Safety performance of a ready made garments building

Fire modeling

Evacuation modeling

Fire safety analysis of a multistoried RMG building is performed by coupling results from fire growth and spread modelling and evacuation modelling. The different geometric features of the building are selected resembling those of a standard RMG building layout approved by the regulatory authorities. The smoke propagation and evacuation scenarios are selected to resemble some of the typical and often overlooked unsafe workplace practices observed in the RMG sector in Bangladesh. Occupant evacuation from a seven-storied RMG building is simulated for these fire scenarios and the effects of smoke temperature, visibility, CO concentration, occupant behavioral features, obstructed/unobstructed evacuation routes, exit condition are analyzed in terms of the required safe evacuation time. This work revealed that an ideal garments factory that complies with the prevailing safety standards will still be under a huge risk of lives due to non-standard workplace practises.

Mixed convection heat transfer in a square cavity

Isotherm at ϕ = 0.00 and wall amplitude ratio λ = 0.05

Isotherm at ϕ = 0.025 and wall amplitude ratio λ = 0.05

Isotherm at ϕ = 0.05 and wall amplitude ratio λ = 0.05

The effect of solid volume fraction (ϕ= 0 ~ 0.05) on isotherm in a square cavity with a wavy bottom having a rotating cylinder in the middle at Ra=10⁵ and Ha=25

Streamlines at Ω = 5 and wall amplitude ratio λ = 0.15

Streamlines at Ω = 10 and wall amplitude ratio λ = 0.15

Streamlines at Ω = 15 and wall amplitude ratio λ = 0.15

The effect of rotational speed (Ω=5~15) on streamlines in a square cavity with a wavy bottom having a rotating cylinder in the middle at Ra=10⁵ ,Ha=25 and λ = 0.15

Mixed convection heat transfer problem in a square cavity having a wavy bottom wall with rotating circular cylinder at the center is analyzed in this numerical investigation. Heat transfer is considered for Ferrofluid (Fe₃O₄ – water) as working fluid. The wavy bottom wall is kept at high temperature and the top wall is cold while the right and left wall are considered insulated. Finite element method is used for the numerical solution of this investigation. The effect of bottom wall amplitude ratio (λ=0.05~0.15), solid volume fraction (ϕ= 0 ~ 0.05), rotational speed (Ω=5~15), Hartmann number (Ha=25~100) and Rayleigh number (Ra=10⁴~10⁶) is evaluated.

Page updated

Google Sites

Report abuse