Semi-empirical correlations for predicting hot gas layer temperature in pre-flashover compartment fires considering fire source location

Calisa Katiuscia Lemmertz*, Rodolfo Prediger Helfenstein, Mohamed Beshir, David Rush, Wolfram Jahn Von Arnswaldt, Felipe Roman Centeno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A series of numerical experiments have been carried out through a CFD code namely Fire Dynamics Simulator (FDS) to analyze the influence of the fire heat source location (transversal, longitudinal and vertical positions) on the hot gas layer temperature (HGLT) in pre-flashover compartment fires. Knowing the HGLT
helps engineers to predict the onset of flashover and to design fire safety systems, which give more time for evacuation procedures. Using these numerical data, and based on an energy balance on the upper layer, new semi-empirical correlations were developed to predict the HGLT in pre-flashover compartment fires, as a function of the fire source location, heat release rate, ventilation factor, surface area, effective heat transfer coefficient and ambient thermal properties. As an external validation of the newly developed correlations, their
outcomes were tested against several sets of experimental data available in the literature, showing a good agreement. So, it is concluded that these improved correlations are capable to predict the HGLT for different pre-flashover fire scenarios, accounting to the position where the fire started
Original languageEnglish
Article number195
Number of pages25
JournalJournal of the Brazilian Society of Mechanical Sciences and Engineering
Volume44
Issue number5
Early online date20 Apr 2022
DOIs
Publication statusPublished - May 2022

Keywords

  • pre-flashover fires
  • Compartment fires
  • heat source location
  • hot gas layer temperature
  • FDS

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