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Natural convection during directional solidification of an AlZn eutectic
Author(s) -
Tuček V.,
Holeček S.,
Kubíček L.
Publication year - 1987
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.2170220603
Subject(s) - directional solidification , eutectic system , natural convection , convection , rayleigh number , turbulence , rayleigh–bénard convection , temperature gradient , buoyancy , materials science , mechanics , crystallite , flow (mathematics) , transverse plane , thermodynamics , combined forced and natural convection , metallurgy , physics , meteorology , alloy , structural engineering , engineering
A study was made of the buoyancy convection of melt provoked by temperature gradient of an orientation identical to that of the gravity vector. The convection was assessed on the basis of temperature fluctuations in the melt. The critical Rayleigh numbers for periodic and turbulent flow were determined. Both periodic and turbulent flow gives rise to transverse “bands” in the structure of the eutection obtained by directional solidification. The intensity of unstable flow affects the number of eutectic crystallites in the sample.