An Investigation of the Laminar Overfire Region Along Upright Surfaces

[+] Author and Article Information
T. Ahmad, G. M. Faeth

Mechanical Engineering Department, The Pennsylvania State University, University Park, Pa.

J. Heat Transfer 100(1), 112-119 (Feb 01, 1978) (8 pages) doi:10.1115/1.3450483 History: Received November 29, 1977; Online August 11, 2010


Numerical calculations are presented for the laminar overfire region along an upright burning surface under natural convection conditions. The process was also examined experimentally, using wicks soaked with methanol, ethanol, and propanol to simulate the burning portion of the surface. Predicted flame shapes and wall heat fluxes were within 15–20 percent of the measurements, for various wall inclination angles, except near the tip of the flame where the reaction is quenched by the cold wall. The wall heat flux is nearly constant in the region where the flame is present, but declines beyond the tip of the flame. Shadowgraphs were employed to determine the position of onset of turbulence. For transition beyond the tip of the flame, the flow was laminar for Grx < .5 − 2 × 108 , although transition is not completely described by this parameter and effects of fuel type, presence or absence of combustion, distance, and wall angle were also observed.

Copyright © 1978 by ASME
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