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Influence of solidification of binary eutectic lamellar systems on surface tension driven convection in zero gravity conditions
Author(s) -
Demo P.,
Farkas L.,
Kratochvil J.
Publication year - 1984
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170191120
Subject(s) - marangoni effect , marangoni number , convection , surface tension , eutectic system , zero gravity , lamellar structure , materials science , thermodynamics , mechanics , instability , physics , metallurgy , microstructure
The effect of solidification of the lamellar binary eutectic system on the onset of surface tension driven convection (so‐called Marangoni instability) is studied in a zero gravity environment. Some main general conclusions concerning the possibility for onset of the Marangoni convection within the melt can be drawn from the analysis, viz., the curvature of the free surface has a destabilizing effect on the onset of the flow; the increased perturbed heat transfer rate from the system stabilizes the melt; the onset of the solutal Marangoni convection closely depends on the ratio of the lamellae half‐widths and the solutal Marangoni instability is more sensitive against the perturbations than the temperature Marangoni one.