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Related Experiment Videos

Large-scale geophysical flows on a table top.

John Hegseth1, Kamel Amara

  • 1Nonlinear Science Laboratory, Department of Physics, University of New Orleans, New Orleans, Lousiana 70148, USA. jhegseth@uno.edu

Annals of the New York Academy of Sciences
|November 26, 2002
PubMed
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Laboratory experiments explored fluid convection in spherical geometry using two buoyancy forces. Researchers observed instabilities leading to upward-traveling rolls under specific conditions, simulating geophysical phenomena.

Area of Science:

  • Geophysics
  • Fluid Dynamics
  • Laboratory Simulations

Background:

  • Geophysical systems often involve complex fluid dynamics under varying buoyancy forces.
  • Spherical geometry is crucial for modeling planetary interiors and atmospheres.
  • Understanding convection is key to explaining phenomena like planetary magnetic fields.

Purpose of the Study:

  • To create laboratory geophysical analogs in spherical geometry.
  • To investigate fluid convection driven by dual buoyancy forces (thermal and electric).
  • To analyze the instability of convection flows and the formation of organized structures.

Main Methods:

  • Utilized two experimental systems with concentric spheres.
  • Employed real-time holographic interferometry and shadowgraph visualization.

Related Experiment Videos

  • Applied thermal gradients (DeltaT) and AC voltage differences (DeltaV) to induce buoyancy.

    • Main Results:

    • Normal gravitational buoyancy consistently produced axisymmetric convection cells.
    • Sufficiently large DeltaT and DeltaV induced instabilities, forming toroidal or spiral rolls.
    • These rolls initiated near the inner sphere's equator and propagated upward.

    Conclusions:

    • Dual buoyancy forces can lead to complex flow instabilities in spherical systems.
    • Observed roll formations provide insights into geophysical fluid dynamics.
    • The study demonstrates the feasibility of simulating geophysical phenomena in controlled laboratory settings.