Granular convection observed by magnetic resonance imaging.

@article{Ehrichs1995GranularCO,
  title={Granular convection observed by magnetic resonance imaging.},
  author={E. Ehrichs and Heinrich M. Jaeger and Greg S. Karczmar and James B. Knight and Vadim Y Kuperman and Sidney R. Nagel},
  journal={Science},
  year={1995},
  volume={267 5204},
  pages={1632-4}
}
Vibrations in a granular material can spontaneously produce convection rolls reminiscent of those seen in fluids. Magnetic resonance imaging provides a sensitive and noninvasive probe for the detection of these convection currents, which have otherwise been difficult to observe. A magnetic resonance imaging study of convection in a column of poppy seeds yielded data about the detailed shape of the convection rolls and the depth dependence of the convection velocity. The velocity was found to… CONTINUE READING