A computational model is developed to study the effects of alumina layer formation
on an ablative surface when exposed to high temperature particle laden gas
flow. The solidification dynamics i.e., the solid and liquid alumina layer growth rate,
and the heat transferred to the ablative surface are investigated. A one-dimensional
model is developed taking into consideration the thermal loading, particle loading
and the temperature dependence of the thermo-physical properties of alumina. A
fully implicit finite volume method is used to solve the coupled set of non-linear heat
conduction equations. The solidification interface is tracked using the Lagrangian
interpolation technique. The particle mass flux was found to be the major factor
affecting the solid layer growth rate. The gas heat flux also has a major effect on
the solid growth rate and the heat transferred to the ablative surface, but only for
lower particle mass fluxes. On other hand the particle temperature has a linear
effect on the solidification dynamics and the heat transferred to the ablative surface
for all particle mass fluxes. The heat transferred to the ablative surface is reduced
by approximately 39% to 88%, depending on the mass fluxes, due to the formation
of the alumina layer. / Graduation date: 2003
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/31591 |
| Date | 07 April 2003 |
| Creators | Thirunavukarasu, Balamurugesh |
| Contributors | Liburdy, James A., Pence, Deborah V. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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