Affiliation:
1. Institute of Nuclear Sciences "Vinča", Laboratory for Thermal Engineering and Energy, Belgrade
2. Faculty of Mechanical Engineering, Belgrade
3. Faculty of Mechanical Engineering, Innovation Center, Belgrade
Abstract
In order to lay a foundation of a credible primary fragmentation model, a
theoretical analysis of the thermo-mechanical processes in a devolatilizing
solid fuel particle was carried out. The devolatilization model comprises
heat transfer, chemical processes of generation of gaseous products of
combustion (volatiles), volatile transfer, and solid mechanic processes. A
spatial and temporal analysis of the stresses within the particle showed that
the radial stress is caused primarily by the pressure of generated volatiles.
This stress monotonously decreases from the particle center towards the
particle surface, without changing its sign. The tangential stress is caused
primarily by the thermal shock. Close to the surface, it changes its sign. In
the particle cross-section, the radial stress prevails close to the particle
center, whilst the tangential stress is dominant in the surface region. At
the points where these stresses exceed the particle tensile strength, cracks
occur. Cracks extend tangentially close to the surface, and radially close to
the center of the particle.
Publisher
National Library of Serbia
Subject
Renewable Energy, Sustainability and the Environment
Cited by
4 articles.
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