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Analysis of a semi-empirical sprinkler spray model
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Aghajani, Hamed, Dembele, Siaka and Wen, Jennifer X. (2014) Analysis of a semi-empirical sprinkler spray model. Fire Safety Journal, Volume 64 . pp. 1-11. doi:10.1016/j.firesaf.2014.01.004 ISSN 0379-7112.
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Official URL: http://dx.doi.org/10.1016/j.firesaf.2014.01.004
Abstract
Modelling the atomization process in fire sprinklers has remained a challenge mainly due to the complexity of sprinkler geometry. A review of existing fire sprinkler spray modelling approaches, including film flow and sheet tracking models, showed that they mainly assumed a constant sheet velocity and linear attenuation of the sheet thickness before its disintegration. In the present study, a liquid sheet trajectory sub-model based on the solution of stream-wise conservation equations has been used to predict both sheet thickness and velocity as it radially expands. This will also help to investigate the extent to which a change in the release angle can affect the sheet characteristics. The analysis carried out shows that the proposed approach improves the predictions of mean droplet diameter and initial droplet speed. A semi-empirical approach is further introduced in the study by using experimental volume fraction measurements to characterize sprinkler sprays in the near field. For a given direction predictions have been conducted for droplet volume median diameter, water volume flux and droplet average velocity at different elevation and azimuthal locations. A reasonably good agreement is found for the near field measurements.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||
Journal or Publication Title: | Fire Safety Journal | ||||||||||
Publisher: | Pergamon | ||||||||||
ISSN: | 0379-7112 | ||||||||||
Official Date: | February 2014 | ||||||||||
Dates: |
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Volume: | Volume 64 | ||||||||||
Page Range: | pp. 1-11 | ||||||||||
DOI: | 10.1016/j.firesaf.2014.01.004 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access |
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