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Nature 444, 281-283 (16 November 2006) | doi:10.1038/444281a; Published online 15 November 2006
Fluid dynamics: Spinning discs in the lab
Steven A. Balbus1
Abstract
What causes gas to be drawn in towards black holes, rather than remain in a stable orbit as planets do around the Sun? A laboratory result indicates that something more than just hydrodynamics must be at work.
On page 343 of this issue, Ji et al.1 describe a meticulous experiment in which they confined water between two independently turning cylinders. Through artful experimental design, the authors were able to reduce viscous effects in the resulting 'Couette' flow to a level of one part in two million.
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