Cover Image

Fast turbulent flames and high overpressures in duct-vented gas explosion

The influence of vent ducts on gas explosions was investigated with the aim of determining whether the use of larger area of the vent duct than the vent, would reduce the overpressure in vented duct explosion. A 0.2 m3 cylindrical vessel was used with L/D (length to diameter) of 2, at the limit of a...

Full description

Saved in:
Bibliographic Details
Main Authors: Md. Kasmani, Rafiziana, H. Hassim, Mimi, R. Ali, Roshafima
Format: Conference or Workshop Item
Published: 2012
Online Access:http://eprints.utm.my/id/eprint/34084/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.utm.34084
record_format eprints
spelling my.utm.340842017-09-06T06:30:59Z http://eprints.utm.my/id/eprint/34084/ Fast turbulent flames and high overpressures in duct-vented gas explosion Md. Kasmani, Rafiziana H. Hassim, Mimi R. Ali, Roshafima The influence of vent ducts on gas explosions was investigated with the aim of determining whether the use of larger area of the vent duct than the vent, would reduce the overpressure in vented duct explosion. A 0.2 m3 cylindrical vessel was used with L/D (length to diameter) of 2, at the limit of applicability of current explosion venting design guidance. Only end ignition was considered in this study with a vent coefficient, K of 16.4. Methane/air mixtures over a range of equivalence ratio, Ф (0.68, 0.84 and 1.05) have been used. Results showed that while there is no significant difference in maximum pressure for larger vent duct as compared to a free discharge vent at lean mixtures, however, a significant increase of overpressure ∼ 1.4 bar was obtained in reactive mixtures i.e. Ф = 1.05. This was due to the high unburnt gas velocities induced in the vent duct by the most reactive explosion, creating very high turbulence levels at the vent duct inlet which gave rise to very fast flames and very high back pressures. Flame speeds in the vent duct of up to 500 m/s were measured for the most reactive mixture in the larger vent duct. The results were not predicted by the current US and European vent design guidance. 2012 Conference or Workshop Item PeerReviewed Md. Kasmani, Rafiziana and H. Hassim, Mimi and R. Ali, Roshafima (2012) Fast turbulent flames and high overpressures in duct-vented gas explosion. In: 26th Symposium of Malaysian Chemical Engineers (SOMchE-2012) in conjunction with 4th International Conference on Chemical and Bioprocess Engineering (ICCBPE-2012).
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
description The influence of vent ducts on gas explosions was investigated with the aim of determining whether the use of larger area of the vent duct than the vent, would reduce the overpressure in vented duct explosion. A 0.2 m3 cylindrical vessel was used with L/D (length to diameter) of 2, at the limit of applicability of current explosion venting design guidance. Only end ignition was considered in this study with a vent coefficient, K of 16.4. Methane/air mixtures over a range of equivalence ratio, Ф (0.68, 0.84 and 1.05) have been used. Results showed that while there is no significant difference in maximum pressure for larger vent duct as compared to a free discharge vent at lean mixtures, however, a significant increase of overpressure ∼ 1.4 bar was obtained in reactive mixtures i.e. Ф = 1.05. This was due to the high unburnt gas velocities induced in the vent duct by the most reactive explosion, creating very high turbulence levels at the vent duct inlet which gave rise to very fast flames and very high back pressures. Flame speeds in the vent duct of up to 500 m/s were measured for the most reactive mixture in the larger vent duct. The results were not predicted by the current US and European vent design guidance.
format Conference or Workshop Item
author Md. Kasmani, Rafiziana
H. Hassim, Mimi
R. Ali, Roshafima
spellingShingle Md. Kasmani, Rafiziana
H. Hassim, Mimi
R. Ali, Roshafima
Fast turbulent flames and high overpressures in duct-vented gas explosion
author_facet Md. Kasmani, Rafiziana
H. Hassim, Mimi
R. Ali, Roshafima
author_sort Md. Kasmani, Rafiziana
title Fast turbulent flames and high overpressures in duct-vented gas explosion
title_short Fast turbulent flames and high overpressures in duct-vented gas explosion
title_full Fast turbulent flames and high overpressures in duct-vented gas explosion
title_fullStr Fast turbulent flames and high overpressures in duct-vented gas explosion
title_full_unstemmed Fast turbulent flames and high overpressures in duct-vented gas explosion
title_sort fast turbulent flames and high overpressures in duct-vented gas explosion
publishDate 2012
url http://eprints.utm.my/id/eprint/34084/
_version_ 1643649509338644480
score 13.211869

Similar Items