6,316 research outputs found
Evaluation of the energy transfer in the char zone during ablation. Part 2: In-depth response of ablative composites, volume 1
The decomposition of ablative composites is described along with the transport phenomena of pyrolysis gases which result from the decomposition of these plastics as they flow through the porous char of char-forming ablators. The pyrolysis products are those formed by the thermal degradation of nylon-phenolic resin and silicone elastomer composites. Emphasis is placed on the nature and extent of chemical reactions of the pyrolysis products and the char, along with the energy absorbed by the combined pyrolysis and char zone. Chemical reactions with thermodynamically consistent kinetic data are determined in order to develop a realistic analysis for predicting the thermal performance of ablative heat shields
Tentative Detection of the Rotation of Eris
We report a multi-week sequence of B-band photometric measurements of the
dwarf planet Eris using the {\it Swift} satellite. The use of an observatory in
low-Earth orbit provides better temporal sampling than is available with a
ground-based telescope. We find no compelling evidence for an unusually slow
rotation period of multiple days, as has been suggested previously. A
1.08 day rotation period is marginally detected at a modest level of
statistical confidence (97%). Analysis of the combination of the
data with the ground-based B-band measurements of \citet{2007AJ....133...26R}
returns the same period (1.08 day) at a slightly higher statistical
confidence (99%).Comment: Accepted to Icarus 2008-Aug-19. 19 pages total, including 4 figures
and 1 tabl
Computation of the equilibrium composition of reacting gas-solid mixtures with material and energy balance constraints Status report
Equilibrium composition computed for reacting- gas-solid composite materials using material and energy constraint
Experimental verification of the non-equilibrium model for predicting behavior in the char zone of a charring ablator Status report
Experimental simulation to establish accuracy of nonequilibrium flow model with system simulating charring during ablatio
Solution of the Frozen Flow Momentum Equation Status Report
Momentum equation solved for frozen flow in char zone of charring ablato
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