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EFFECT OF HEATING A SEMITRANSPARENT MEDIUM BY RADIANT ENERGY ON IGNITION CHARACTERISTICS IN THERMAL-EXPLOSION THEORY
Faculty
Not Specified
Year:
1995
Type of Publication:
Article
Pages:
103-110
Authors:
ElSayed, SA
DOI:
10.1016/0950-4230(95)00005-L
Journal:
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES BUTTERWORTH-HEINEMANN LTD
Volume:
8
Research Area:
Engineering
ISSN
ISI:A1995RE94200008
Keywords :
SELF-IGNITION, EXPLOSION, SEMITRANSPARENT MEDIUM
Abstract:
In ignition theory, there are no volume heat sources in a substance which is being heated through the surface. In most actual cases, ignition occurs under more complex heating conditions. One of these heating conditions is the ignition of a semi-transparent body by the flow of radiant energy. This case is investigated, showing the effect of the presence of volume heat sources of anon-chemical nature on critical and ignition conditions. The Arrhenius heat reaction law and the Frank-Kamenetskii exponential approximation for this law are also used. The ignition characteristics and transition conditions are demonstrated. The transition conditions can be obtained from the condition d theta/d theta(a) = 0, as well as from d(2) psi/d theta(2) = 0. The results show that the critical point in the temperature-time plane can be obtained by setting d theta/d tau = 0, d(2) theta/d tau(2) = 0, and d(3) theta/d tau(3) = 0. The non-stationary solutions are also presented.
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