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Theoretical studies in support of the 3M-vapor transport (PVTOS-) experimentsResults are reported for a preliminary theoretical study of the coupled mass-, momentum-, and heat-transfer conditions expected within small ampoules used to grow oriented organic solid (OS-) films, by physical vapor transport (PVT) in microgravity environments. It is show that previous studies made restrictive assumptions (e.g., smallness of delta T/T, equality of molecular diffusivities) not valid under PVTOS conditions, whereas the important phenomena of sidewall gas creep, Soret transport of the organic vapor, and large vapor phase supersaturations associated with the large prevailing temperature gradients were not previously considered. Rational estimates are made of the molecular transport properties relevant to copper-phthalocyanine monomeric vapor in a gas mixture containing H2(g) and Xe(g). Efficient numerical methods have been developed and are outlined/illustrated here to making steady axisymmetric gas flow calculations within such ampoules, allowing for realistic realistic delta T/T(sub)w-values, and even corrections to Navier-Stokes-Fourier 'closure' for the governing continuum differential equations. High priority follow-on studies are outlined based on these new results.
Document ID
19890016808
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Rosner, Daniel E. (Yale Univ. New Haven, CT, United States)
Keyes, David E. (Yale Univ. New Haven, CT, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1989
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-CR-185122
NAS 1.26:185122
Accession Number
89N26179
Funding Number(s)
CONTRACT_GRANT: NAG3-898
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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