The effects of shrinkage flow and gravity level on the onset of convection during vertical directional dendritic solidification of NH4Cl-H2OA numerical investigation of the conditions influencing the onset of convection during Bridgman vertical directional solidification of NH4Cl- 72 wt percent H2O has been made using a linear stability model. The effects of shrinkage flow and gravity level on the transition from diffusion-dominated to convection-dominated solidification are shown to be significant. Both shrinkage flow opposite the direction of growth and increased gravity levels tend to decrease the stability limits defining the onset of convection for the solidifying NH4Cl-H2O system.
Document ID
19930038670
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hopkins, J. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Mccay, T. D. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Mccay, M. H. (Tennessee Univ. Tullahoma, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Materials Processing
Report/Patent Number
AIAA PAPER 93-0261
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit