Challenges in determining critical mass flux for ignition
(2015) 14th International Conference and Exhibition on Fire and Materials 2015 p.198-209- Abstract
Traditionally in fire modelling, a solid fuel has been assumed to ignite when the solids surface reaches a specific temperature or when the heat flux upon the solid reaches a critical level. Although these approaches of determining ignition for the condensed phase are practical, ignoring the gas phase conditions may lead to incorrect assumptions regarding material safety. A more 'physical' explanation for piloted ignition cases may be that ignition occurs when the fuel-air-mixture around the location of a pilot has reached the lower flammability limit. In this study, challenges of retrieving a critical mass flux for piloted ignition is theoretically evaluated. Then a simple model is presented, by which the critical mass flux (analogous... (More)
Traditionally in fire modelling, a solid fuel has been assumed to ignite when the solids surface reaches a specific temperature or when the heat flux upon the solid reaches a critical level. Although these approaches of determining ignition for the condensed phase are practical, ignoring the gas phase conditions may lead to incorrect assumptions regarding material safety. A more 'physical' explanation for piloted ignition cases may be that ignition occurs when the fuel-air-mixture around the location of a pilot has reached the lower flammability limit. In this study, challenges of retrieving a critical mass flux for piloted ignition is theoretically evaluated. Then a simple model is presented, by which the critical mass flux (analogous to the piloted fire point) of a solid fuel's effluents may be obtained. Finally, the model is validated against literature data. Initial results indicate that the model predicts ignition reasonably well, however further validation needs to be done, both when it comes to predicting ignition for different types of materials and for other environments.
(Less)
- author
- Lundström, Frida Vermina LU and Van Hees, Patrick LU
- organization
- publishing date
- 2015
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- Fire and Materials 2015 - 14th International Conference and Exhibition, Proceedings
- pages
- 198 - 209
- publisher
- Interscience Communications Ltd
- conference name
- 14th International Conference and Exhibition on Fire and Materials 2015
- conference location
- San Francisco, United States
- conference dates
- 2015-02-02 - 2015-02-04
- external identifiers
-
- scopus:84983134862
- language
- English
- LU publication?
- yes
- id
- aa519c39-782c-4104-a8df-c5ef7ea96e8b
- date added to LUP
- 2016-11-05 14:02:13
- date last changed
- 2022-01-30 07:17:43
@inproceedings{aa519c39-782c-4104-a8df-c5ef7ea96e8b,
abstract = {{<p>Traditionally in fire modelling, a solid fuel has been assumed to ignite when the solids surface reaches a specific temperature or when the heat flux upon the solid reaches a critical level. Although these approaches of determining ignition for the condensed phase are practical, ignoring the gas phase conditions may lead to incorrect assumptions regarding material safety. A more 'physical' explanation for piloted ignition cases may be that ignition occurs when the fuel-air-mixture around the location of a pilot has reached the lower flammability limit. In this study, challenges of retrieving a critical mass flux for piloted ignition is theoretically evaluated. Then a simple model is presented, by which the critical mass flux (analogous to the piloted fire point) of a solid fuel's effluents may be obtained. Finally, the model is validated against literature data. Initial results indicate that the model predicts ignition reasonably well, however further validation needs to be done, both when it comes to predicting ignition for different types of materials and for other environments.</p>}},
author = {{Lundström, Frida Vermina and Van Hees, Patrick}},
booktitle = {{Fire and Materials 2015 - 14th International Conference and Exhibition, Proceedings}},
language = {{eng}},
pages = {{198--209}},
publisher = {{Interscience Communications Ltd}},
title = {{Challenges in determining critical mass flux for ignition}},
year = {{2015}},
}