A Simplified Relation Between Hot Layer Height and Opening Mass Flow
Johansson, Nils LU
and Van Hees, Patrick
LU
(2014)
11th International Symposium on Fire Safety Science
- Abstract
- The mass flow of air through an opening in a well-mixed compartment fire can be calculated with a simple expression. Similar simple models are lacking for the stratified pre-flashover case. Usually an advanced computer model is required to calculate the mass flow through an opening in a pre-flashover compartment fire. However, two equations for the opening mass flow through an opening are presented and validated in this paper.
The presented equations are predominantly valid for temperatures above 200°C and predictions with the equations are shown to be within 10% of results from computer simulations and experimental measurements. The equations can also be combined with existing plume models in order to give an estimate of the hot... (More) - The mass flow of air through an opening in a well-mixed compartment fire can be calculated with a simple expression. Similar simple models are lacking for the stratified pre-flashover case. Usually an advanced computer model is required to calculate the mass flow through an opening in a pre-flashover compartment fire. However, two equations for the opening mass flow through an opening are presented and validated in this paper.
The presented equations are predominantly valid for temperatures above 200°C and predictions with the equations are shown to be within 10% of results from computer simulations and experimental measurements. The equations can also be combined with existing plume models in order to give an estimate of the hot layer height in a compartment fire with a predefined heat release rate. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4301135
- author
- Johansson, Nils
LU
and Van Hees, Patrick
LU
- organization
- publishing date
- 2014
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- fire dynamics, mass flow, zone model, hot layer height
- host publication
- [Host publication title missing]
- pages
- 12 pages
- publisher
- The International Association of Fire Safety Science
- conference name
- 11th International Symposium on Fire Safety Science
- conference location
- Christchruch, New Zealand
- conference dates
- 2014-02-09 - 2014-02-14
- external identifiers
-
- scopus:84975147949
- language
- English
- LU publication?
- yes
- id
- fd17959b-d155-416b-9c9c-bf34fa1cd36f (old id 4301135)
- alternative location
- http://www.iafss.org/publications/fss/11/106/view
- date added to LUP
- 2016-04-04 10:24:31
- date last changed
- 2022-02-06 05:44:17
@inproceedings{fd17959b-d155-416b-9c9c-bf34fa1cd36f,
abstract = {{The mass flow of air through an opening in a well-mixed compartment fire can be calculated with a simple expression. Similar simple models are lacking for the stratified pre-flashover case. Usually an advanced computer model is required to calculate the mass flow through an opening in a pre-flashover compartment fire. However, two equations for the opening mass flow through an opening are presented and validated in this paper. <br/><br>
The presented equations are predominantly valid for temperatures above 200°C and predictions with the equations are shown to be within 10% of results from computer simulations and experimental measurements. The equations can also be combined with existing plume models in order to give an estimate of the hot layer height in a compartment fire with a predefined heat release rate.}},
author = {{Johansson, Nils and Van Hees, Patrick}},
booktitle = {{[Host publication title missing]}},
keywords = {{fire dynamics; mass flow; zone model; hot layer height}},
language = {{eng}},
publisher = {{The International Association of Fire Safety Science}},
title = {{A Simplified Relation Between Hot Layer Height and Opening Mass Flow}},
url = {{http://www.iafss.org/publications/fss/11/106/view}},
year = {{2014}},
}