Publications

Results 26–50 of 109
Skip to search filters

Diagnostics and testing to assess the behavior of organic materials at high heat flux

Proceedings of the Thermal and Fluids Engineering Summer Conference

Brown, Alexander B.; Anderson, Ryan R.; Tanbakuchi, Anthony; Coombs, Deshawn

Pyrolysis of materials at high heat fluxes are less well-studied because the high heat flux regime is not as common to many practical fire applications. The fire behavior of organic materials in such an environment needs further characterization in order to construct models to predict the dynamics in this regime. The test regime is complicated because of the temperatures achieved and the speed at which materials decompose, due to the flux condition. A series of tests has been performed, which exposed a variety of materials to this environment. The resulting imagery from the tests provides some unique insights into the behavior of various materials at these conditions. Furthermore, experimental and processing techniques suggest analytical methods that can be employed to extract quantitative information from pyrolysis experiments.

More Details
TYPE Conference Poster YEAR 2019
ScopusOSTI

Pyrolysis under extreme heat flux characterized by mass loss and three-dimensional scans

Proceedings of the Thermal and Fluids Engineering Summer Conference

Engerer, Jeffrey D.; Brown, Alexander B.

A variety of energy sources produce intense radiative flux (»100 kW/m2) well beyond those typical of fire environments. Such energy sources include directed energy, nuclear weapons, and propellant fires. Studies of material response to irradiation typically focus on much lower heat flux; characterization of materials at extreme flux is limited. Various common cellulosic and synthetic-polymer materials were exposed to intense irradiation (up to 3 MW/m2) using the Solar Furnace at Sandia National Laboratories. When irradiated, these materials typically pyrolyzed and ignited after a short time (<1 s). The mass loss for each sample was recorded; the topology of the pyrolysis crater was reconstructed using a commercial three-dimensional scanner. The scans spatially resolved the volumetric displacement, mapping this response to the radially varying flux and fluence. These experimental data better characterize material properties and responses, such as the pyrolysis efflux rate, aiding the development of pyrolysis and ignition models at extreme heat flux.

More Details
TYPE Conference Poster YEAR 2019
ScopusOSTIDOI
Results 26–50 of 109
Results 26–50 of 109