NDLI: Effects of space environment on flow and concentration during directional solidification

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Effects of space environment on flow and concentration during directional solidification

Content Provider	NASA Technical Reports Server (NTRS)
Author	deGroh II, H. C. Benjapiyaporn, C. Leonardi, E. Timchenko, V. deVahlDavis, G.
Copyright Year	2000
Description	A study of directional solidification of a weak binary alloy (specifically, Bi - 1 at% Sn) based on the fixed grid single domain approach is being undertaken. The enthalpy method is used to solve for the temperature field over the computational domain including both the solid and liquid phases; latent heat evolution is treated with the aid of an effective specific heat coefficient. A source term accounting for the release of solute into the liquid during solidification has been incorporated into the solute transport equation. The vorticity-stream function formulation is used to describe thermosolutal convection in the liquid region. In this paper we numerically investigate the effects of g-jitter on directional solidification. A background gravity of 1 micro-g has been assumed, and new results for the effects of periodic disturbances over a range of amplitudes and frequencies on solute field and segregation have been presented.
File Size	1227305
File Format	PDF
Language	English
Publisher Date	2000-04-01
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Temperature Distribution Latent Heat Binary Alloys Gravitation Directional Solidification Crystals Aerospace Environments Vorticity Convection Solid Phases Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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