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The Multipoint Detection of Products of Combustion With Tube Bundles, Transit Times, Transmissions of Submicrometer Particulates and General Applicability.

Authors
Hertzberg-M; Litton-CD
Source
NTIS: PB 259 472 :40 pages
Link
NIOSHTIC No.
10000356
Abstract
This Bureau of Mines study concerns the use of the tube bundle method as a sensitive and reliable detector of mine fires. The method involves the pneumatic, sequential sampling of many points in a system through branching tube bundles that lead to a single analytic station of high sensitivity, good reliability, and convenient location. Two serious limitations inhibit its use: the relatively slow response times for long lengths of narrow sampling tubes and the wall-diffusion losses for submicrometer smoke particulates. These limitations were quantitatively evaluated by measuring tube transit times and smoke particulate transmissions as a function of tube length, diameter, and pressure drop. New equations were derived for these cases, and the measured transit time data gave reasonable agreement with calculated solutions in both the laminar and turbulent regimes. The measured transmission losses of smoke particulates from several combustion sources compared favorably with those expected from brownian diffusion losses to the interior walls of the sampling tubes.
Publication Date
19760101
Document Type
IH; Report of Investigations
Fiscal Year
1976
NTIS Accession No.
PB-259472
NTIS Price
A04
Identifying No.
RI-8171
NIOSH Division
PRC;
Source Name
NTIS: PB 259 472
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