Investigating sublimation and the effect of an imaging gas in a VPSEM

Waller, D.; Stokes, D. J.; Donald, Athene M.

doi:10.1051/epjap/2010065

Cited by 1 publication

(2 citation statements)

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“…‫ܫ‬ሷ ‫ܨ‬ ௧ ሺ, ሶ , ܶሻ ൌ Γሺ, ܾ, ‫,ݐ‬ ܶሻ (11) in which b, t, and T represent, respectively, the body force, time step, and temperature. Updates to nodal positions are done with rubber like mechanical properties imposed on the sublimating material:…”

Section: Aspects Of the Numerical Analysismentioning

confidence: 99%

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Transient thermal protection of film covering circular aperture by sublimation and weak decomposition

Havstad

Miles

Hsieh

2015

Fusion Engineering and Design

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Unwanted heating of sensitive surfaces in harsh thermal environments can be prevented by precise application of sacrificial materials such as sublimation layers and pyrolyzing films. The use of sublimation for the protection of circular polyimide membranes subjected to brief (~100 msec) heating by infrared radiation and hot (6000 K) inert gas convection is analyzed. Selection of sublimation material and sublimation layer and membrane thickness is considered with emphasis on providing sufficient thermal protection yet negligible unwanted material remaining at the end of a specified heating period. Though the analysis here is general, the motivation is protection of the polyimide films covering the laser entrance holes on IFE (inertial fusion energy) hohlraums being injected into the hot gas (xenon) protecting IFE reactor chambers.Both one and two dimensional thermal models are used to develop a robust thermal concept.Sensitivity analyses (SA) methods are exercised to show where the design may be vulnerable and which input parameters have the greatest effect on performance and likelihood of success. For the design and conditions considered, methane sublimating layers are probably preferred over xenon or pentane.

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Section: Aspects Of the Numerical Analysismentioning

confidence: 99%

“…] may be well -condensing cover gases on the sublimation rate of the protective sublimating layer is not clear [10][11][12]. In others they can enhance it.…”

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confidence: 99%