Translational and rotational temperatures of a 2D vibrated granular gas in microgravity

. We present an experimental study performed on a vibrated granular gas enclosed into a 2D rectangular cell. Experiments are performed in microgravity conditions achieved during parabolic flights. High speed video recording and optical tracking allow to obtain the full kinematics (translation and ro...

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Bibliographic Details
Published in:The European physical journal. E, Soft matter and biological physics Soft matter and biological physics, 2015-02, Vol.38 (2), p.93-93, Article 8
Main Authors: Grasselli, Y., Bossis, G., Morini, R.
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biophysics
Complex Fluids and Microfluidics
Complex Systems
Condensed Matter
Materials Science
Nanotechnology
Physics
Physics and Astronomy
Polymer Sciences
Regular Article
Soft and Granular Matter
Surfaces and Interfaces
Thin Films
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Summary:. We present an experimental study performed on a vibrated granular gas enclosed into a 2D rectangular cell. Experiments are performed in microgravity conditions achieved during parabolic flights. High speed video recording and optical tracking allow to obtain the full kinematics (translation and rotation) of the particles. The inelastic parameters are retrieved from the experimental trajectories as well as the translational and rotational velocity distributions. We report that the experimental ratio of translational versus rotational temperature decreases with the density of the medium but increases with the driving velocity of the cell. These experimental results are compared with existing theories and we point out the differences observed. We also present a model which fairly predicts the equilibrium experimental temperatures along the direction of vibration. Graphical abstract
ISSN:1292-8941
1292-895X
DOI:10.1140/epje/i2015-15008-5