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Effect of Duct Fire on the Ventilation Air Velocity.

Authors
Hwang-CC; Chaiken-RF
Source
NTIS: PB 289 800 :19 pages
Link
NIOSHTIC No.
10007870
Abstract
In this Bureau of Mines report, a previously developed theory of reverse stratified flow in ventilated duct fires is applied to mine- related ventilation systems that utilize an exhaust fan to supply the forced airflows. The coupling between a fire and the ventilation airflow in a single-entry duct is analyzed to relate the air velocity in the absence of a fire to air velocity during a fire. By combining the derived coupling equations with the results of the previously developed theory of reverse stratified flow, it is possible to calculate critical flow velocities required to prevent reverse stratified flow in the event of a duct fire. The sample calculations shown agree with the few experimental results available from small-scale tunnel fires.
Publication Date
19780101
Document Type
IH; Report of Investigation;
Fiscal Year
1978
NTIS Accession No.
PB-289800
NTIS Price
A03
Identifying No.
RI 8311
NIOSH Division
PRC;
Source Name
NTIS: PB 289 800
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