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Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite
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Granular convection in microgravity.

N Murdoch1, B Rozitis, K Nordstrom

  • 1Laboratoire Lagrange, UMR 7293, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur, 06300 Nice, France. murdoch@oca.eu

Physical Review Letters
|February 7, 2013
PubMed
Summary
This summary is machine-generated.

Gravity significantly impacts secondary convective flows in dense granular shear flows. These flows diminish in microgravity and strengthen under higher gravity, driven by gravity-tuned frictional interactions.

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Area of Science:

  • Physics
  • Geophysics
  • Materials Science

Background:

  • Dense granular shear flows are common in geophysical and industrial processes.
  • Secondary convective-like flows can occur in sheared granular materials.
  • The role of gravity in driving these secondary flows is not fully understood.

Purpose of the Study:

  • To experimentally investigate the influence of gravity on secondary convective flows in dense granular shear.
  • To determine how varying gravitational forces affect particle interactions and flow behavior.

Main Methods:

  • Utilized a microgravity-modified Taylor-Couette shear cell during parabolic flights.
  • Conducted experiments under both microgravity and enhanced gravity conditions.
  • Analyzed primary and secondary flow fields and plastic deformation.

Main Results:

  • Secondary convective-like flows were found to be near zero in microgravity.
  • These secondary flows were enhanced under high-gravity conditions.
  • Primary flow fields remained largely unaffected by gravity.
  • Plastic deformation increased with increasing gravitational forces.

Conclusions:

  • Gravity plays a crucial role in tuning frictional particle-particle and particle-wall interactions.
  • These gravity-tuned frictional forces are the likely drivers of secondary convective flows in granular shear.
  • Friction is identified as the fundamental cause of gravity-dependent secondary flows.