Flows induced by inclined rotation in directional solidification of variable-viscosity solutions
Resource
Journal of Crystal Growth 233 (4): 881-896
Journal
Journal of Crystal Growth
Journal Volume
233
Journal Issue
4
Pages
881-896
Date Issued
2001
Date
2001
Author(s)
Chang, Min Hsing
Abstract
As the unidirectional-solidifying melt rotates with respect to an inclined axis, a shear flow is induced to move parallel to the melt/solid interface while it changes its direction along the axis perpendicular to the interface, like an Ekman spiral flow. This induced flow will in turn alter the morphology of the solidifying melt/solid interface and eventually influence the quality of the final casting. In the present paper, we investigate this induced flow in the system rotating in a general way while physical conditions vary: different rotating conditions, different thermal and solutal gradients, and the non-Boussinesq effect due to variable viscosity of the melt. Results show that, in brief, the induced flow is driven by the gravity due to inclination while modified by rotation. As each of the following parameters is higher: the effective Taylor number (Te), the thermal Rayleigh number (Rt), the solutal Rayleigh number (Rc), or the Lewis number (Le), the induced flow is of larger velocity. The variable-viscosity effect is more complex, depending on the value of other physical parameters. © 2001 Elsevier Science B.V. All rights reserved.
Subjects
A1. convection; A1. directional solidification; A1. fluid flows; A1. morphological stability; A2. growth from melt; A2. industrial crystallization
Other Subjects
Crystallization; Gravitational effects; Heat convection; Interfaces (materials); Metal casting; Shear flow; Solidification; Thermal gradients; Viscosity of liquids; Inclined rotations; Solutal gradients; Crystal growth from melt
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
14.pdf
Size
312.41 KB
Format
Adobe PDF
Checksum
(MD5):7c369336fdda9ef46a539888729c3d0d