Digital Imaging Velocimetry is used to Analyze Particle Motion in a Rotating Fluid Sphere and Spherical Shell
Abstract
Some of the inertial modes of a sphere and a spherical shell proportional to the Earth's fluid core are excited using mechanical means. A camera and a laser module are mounted in the rotating frame so that when at solid body rotation there are minimal particle motions relative to the camera. Particle motions are then captured using Digital Imaging Velocimetry (DIV) when a mode is excited. We will show that both the particle velocity vectors and the modal frequencies match well with the predicted values. Although some of these modes had been observed using different means, the present set up provides new means to study particle motion in the Earth's fluid core.
- Publication:
-
AGU Spring Meeting Abstracts
- Pub Date:
- May 2009
- Bibcode:
- 2009AGUSMDI71A..04S
- Keywords:
-
- 1213 Earth's interior: dynamics (1507;
- 7207;
- 7208;
- 8115;
- 8120);
- 5724 Interiors (8147);
- 8115 Core processes (1213;
- 1507)