Document


Title

Possible effects of ree convection on fire behavior - laminar and turbulent line and point sources of heat
Document Type: Book
Author(s): S. Scesa ; F. M. Sauer
Publication Year: 1954

Cataloging Information

Keyword(s):
  • combustion
  • convection
  • elevation
  • heat
  • statistical analysis
  • temperature
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 38978
Tall Timbers Record Number: 13602
TTRS Location Status: In-file
TTRS Call Number: Fire File
TTRS Abstract Status: Okay, Fair use, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.

Description

From the Summary ... 'The transfer theory is applied to the problem of atmospheric diffusion of momentum and heat induced by line and point sources of heat on the surface of the earth. In order that the validity of the approximations of the boundary layer theory be realized, the thickness of the layer in which the temperatures and velocities differ appreciably from the values at infinity must be small compared to the height of the region of influence. Variations of four dependent variables--inflow rate, inflow velocities, maximum velocities, and maximum temperature--as a function of elevation for representative heat source strengths are compared for the four cases investigated. In addition, the shape of the region of influence and the factors affecting the shape are investigated. Results indicate that laminar sources tend to become uniform in cross-section with large vertical velocities and temperatures, thereby indicating a low lateral tendency to diffuse bouyancy and momentum. The turbulent sources diverge with a rapid diffusion of bouyancy and momentum depending upon the mixing length proportionality constant. Application of the turbulent point source results to a finite area source has been presented by postulating that the dependent variably of indraft velocity, maximum temperature and maximum vertical velocity of the finite area source can be produced by a point source of equivalent heat strength functioning at a specified distance below the finite source. Data concerning the behavior of the aforementioned variables induced by a finite area heat source do not exist. Therefore, experimental investigation are necessary to provide guidance for further analysis.'

Citation:
Scesa, S., and F. M. Sauer. 1954. Possible effects of ree convection on fire behavior - laminar and turbulent line and point sources of heat. Interim Technical Report No. 417. Washington, DC, USDA Forest Service, Division Fire Research.