Interflam 2016

It was great to attend to Interflam 2016 at Royal Holloway College, UK on 4 - 6 July 2016. The participation was great and so it was the level of the presentations. I was on the session "Predictions of Soot Generation & Visibility" together with Jason Floyd (Jensen Hughes, USA), Jason Huczek and Marc Janssens (SwRI - Southwest Research Institution, USA). I presented something similar to presented last May in Warsaw but with a different focus: the ASET (Available Safe Egress Time) and the influence of the soot yield in it (through smoke visibility).

I will share my presentation soon but for the time being I just want to share this new findings, i.e. how the ASET changes when changing the soot yield.

Soot Yield (g/g)
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
Time to reach 10m Visibility (s) – FDS*
600
300
138
68
42
26
24
20
20
16
Time to reach 10m Visibility (s) – Fluent*
600
267
99
34
24
21
18
17
16
16

Soot Yield (g/g)
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18
0.19
0.20
Time to reach 10m Visibility (s) – FDS*
16
16
14
12
12
10
8
8
8
8
Time to reach 10m Visibility (s) – Fluent*
15
15
13
12
12
10
9
9
9
8


As can be seen in the table using a chemical reaction with a soot yield value of 0.02 g/g it takes roughly 300 s for the visibility (for reflecting signs) to reach 10m, whilst with a soot yield value of 0.04 g/g, would take approximately 68 s and just 16 s with a soot yield of 0.10 g/g. This means that for the same fire scenario the implications of choosing a reaction instead of another can lead to a huge over prediction of the Available Safe Egress Time and therefore a huge under estimation of the Fire Safety of the building.

I also show you some pictures of the tests we uses, performed by Wojciech Węgrzyński (coauthor of all this work).

Comparison of methanol (Ys = 0,001), iso-propanol (Ys = 0,015), heptane (Ys = 0,044) and toluene (Ys = 0,178 g/g) fires


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