Abstract
This research was dedicated to experimental observation of convection in a fluid subjected to a stabilizing thermal gradient during centrifugation. A laser light cut technique was employed to visualize convection in a test cell consisting of a transparent cylinder enclosed with two metal disks at the top and bottom. A concave shape was machined onto the bottom disk in order to simulate an interface typical for gradient freeze solidification of semiconductors. A constant vertical temperature gradient, similar to that used in gradient freeze crystal growth, was maintained in the cell. Convection was observed in water at several net acceleration levels, from 1 to 4g. Without rotation (1 g), buoyancy caused the usual two-dimensional axisymmetric flow pattern. Centrifugation introduced the Coriolis force and caused the flow near the “interface” to be predominantly rotational about the axis, as predicted by theory. With an uncooled plastic bottom, the flow there split to form two rotating cells in the cross sectional plane. No flow transition was found over the range of acceleration investigated, and the flow velocities were not strongly dependent on g.
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Skudarnov, P.V., Regel, L.L., Wilcox, W.R. (1997). Flow Visualization Study of Convection in a Centrifuge. In: Regel, L.L., Wilcox, W.R. (eds) Centrifugal Materials Processing. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5941-2_6
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DOI: https://doi.org/10.1007/978-1-4615-5941-2_6
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