A Numerical Method Of Calculation Of Vertical And Horizontal Profiles Of Thermal Gradients, Mass Densities, And Rise Velocities In Large Fires

Ernesto E. Gemoets; Robert G. McIntyre; Leopoldo A. Gemoets

doi:10.1117/12.948393

9 September 1985 A Numerical Method Of Calculation Of Vertical And Horizontal Profiles Of Thermal Gradients, Mass Densities, And Rise Velocities In Large Fires

Ernesto E. Gemoets, Robert G. McIntyre, Leopoldo A. Gemoets

Author Affiliations +

Proceedings Volume 0547, Effects of the Environment on Systems Performance; (1985) https://doi.org/10.1117/12.948393
Event: 1985 Technical Symposium East, 1985, Arlington, United States

Abstract

The theoretical studies of the transmission of electromagnetic radiation through large fires have been generally postulated as either uniform conditions horizontally across the rising products of combustion or, at best, some assumed, easily formulated inhomogeneity in order to make the mathematics more tractable. In a previous paper the authors presented a new logical approach to the treatment of time-dependent processes, the Sequential Process Method in which complex time-dependent processes are broken down into a chronologic sequence of sub-processes each assumed, during one cycle of events, to be occurring during the same time step. The method we elucidated by applying it to a rather simple physical picture, that of radiating symmetric concentric sleeves over a uniformly burning, flat circular fire. In this work the physical picture is extended to include non-uniform, radially symmetric, large flat fires, and the method of transport between sleeves has been generalized. An improved method of accounting for the behavior at the interface of two distinct gas volumes is proposed, and the effects of application of such procedures are illustrated. Velocity and temperature profiles calculated suggest the need for theoretical study of diffusion processes not considered in current fire kinetic studies, including the inclusion of an outer plume "sleeve" which was initially part of the ambient. Recommendations are given for future research in fire kinetics which would explain effects of wind and temperature gradients in the atmosphere, the distribution of particulates in the fire plume, and describe a fire as a source of long-term obscurants.

Citation Download Citation

Ernesto E. Gemoets, Robert G. McIntyre, and Leopoldo A. Gemoets "A Numerical Method Of Calculation Of Vertical And Horizontal Profiles Of Thermal Gradients, Mass Densities, And Rise Velocities In Large Fires", Proc. SPIE 0547, Effects of the Environment on Systems Performance, (9 September 1985); https://doi.org/10.1117/12.948393

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Scanning probe microscopy

Combustion

Gases

Atmospheric particles

Electromagnetic radiation

Mathematics

Numerical analysis

Show All Keywords

Keywords/Phrases

Search In:

Publication Years