7.6 Average Temperatures at Junctions and Forks
261
A
B
C
Fig. 7.5 Diagram of a point separated from the focus of a fire by several forks
TA= TB
X
VA
V B
X 1
X 2
X 3
AB
BC
TC
Fig. 7.6 Obtaining temperatures at a point separated from the focus of a fire by several bifurcations
The explanation given above was chosen for its conceptual simplicity. However, the
current trend in the study of fires inside mines involves the use of Computational
Fluid Dynamics (CFD). This type of work goes beyond the purposes of this text.
Readers interested in further information can consult Surkov (1975) and Hansen
(2010), which provide an exhaustive bibliographical survey.
7.7 Calculation of Critical Speed
In the event of a fire inside a gallery or tunnel, it is necessary to ensure that fumes move
in the opposite direction to that of evacuation. If conditions are such that backlayering
occurs then evacuation may be compromised.
6 In order to supply sufficient fresh
6 Normally, the direction of evacuation opposes that of the fresh airflow.
261
A
B
C
Fig. 7.5 Diagram of a point separated from the focus of a fire by several forks
TA= TB
X
VA
V B
X 1
X 2
X 3
AB
BC
TC
Fig. 7.6 Obtaining temperatures at a point separated from the focus of a fire by several bifurcations
The explanation given above was chosen for its conceptual simplicity. However, the
current trend in the study of fires inside mines involves the use of Computational
Fluid Dynamics (CFD). This type of work goes beyond the purposes of this text.
Readers interested in further information can consult Surkov (1975) and Hansen
(2010), which provide an exhaustive bibliographical survey.
7.7 Calculation of Critical Speed
In the event of a fire inside a gallery or tunnel, it is necessary to ensure that fumes move
in the opposite direction to that of evacuation. If conditions are such that backlayering
occurs then evacuation may be compromised.
6 In order to supply sufficient fresh
6 Normally, the direction of evacuation opposes that of the fresh airflow.