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Thermal History of Rock-dust Particles in a Gas Flame Preheat Zone.

Authors
Perlee-HE; Edwards-JC
Source
NTIS: PB 252 475 :33 pages
Link
NIOSHTIC No.
10000482
Abstract
In a Bureau of Mines study two-dimensional mathematical equations were solved that describe the transient thermal response of a rock dust particle in a cloud of similar particles in a gas flame's preheat zone subject to a radiant field from the approaching flame. The description includes both radiant energy absorbed and emitted by the particle and thermal conduction inside the particle and into the surrounding gas environment moving relative to the particle. Two situations were studied; in one the radiant energy incident on the particle is converted to thermal energy at the particle surface, and in the other the radiant energy is converted to thermal energy uniformly over the volume of the particle. The result of the study showed that for a 10-um-radius particle, a 200-mg 1-1 loading density, and a flame approach velocity of 30 m sec-1, the particle temperature rise was twice that previously calculated by singer and cook based on the model of essenhigh and csaba. It was further established that under the conditions examined a rock dust particle temperature never increases more than about 200 k before crossing the flame front.
Publication Date
19760101
Document Type
IH; Report of Investigations
Fiscal Year
1976
NTIS Accession No.
PB-252475
NTIS Price
A04
Identifying No.
RI 8135
NIOSH Division
PRC;
Source Name
NTIS: PB 252 475
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