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Updated: Apr 26, 2026

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
Published on: June 1, 2016
Comments on the low frequency radiation impedance of a duct exhausting a hot gas
Avraham Hirschberg1, Maarten Hoeijmakers2
1Department of Applied Physics, Technische Universiteit Eindhoven, Postbus 513, 5600 MB Eindhoven, Netherlands A.Hirschberg@tue.nl.
Abstract:
The influence of convection and temperature on the radiation impedance of an open duct termination exhausting a hot gas is commonly described by a complex theory. A simplified analytical expression is proposed for low frequencies. Both models assume a free jet with uniform velocity bounded by infinitely thin shear layers. The convective velocity that should be assumed when applying these models to a non-uniform outflow is uncertain. A simplified version of the so-called Vortex Sound Theory demonstrates that the convective velocity one should assume is lower than the jet centerline velocity.
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