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Experimental study of energy exchanges between two coupled granular gases
J-Y Chastaing1, J-C Géminard1, A Naert1
1Université de Lyon, Ens de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France.
Physical Review. E
|January 14, 2017
Summary
Researchers explored energy transfer between two granular gases using immersed blades. This method effectively measures granular gas properties, revealing asymmetric energy flux fluctuations in systems with differing densities.
Area of Science:
- Physics
- Granular Materials Science
- Electromechanical Systems
Background:
- Granular gases, composed of macroscopic particles, exhibit complex behaviors distinct from molecular gases.
- Electromechanical coupling offers a novel approach to probe and control granular gas dynamics.
Purpose of the Study:
- To investigate energy exchange dynamics between two granular gases of differing densities.
- To evaluate the utility of immersed blades coupled to DC motors as a tool for characterizing granular gases.
- To analyze the statistical properties of energy flux fluctuations under weak coupling conditions.
Main Methods:
- Utilizing two granular gases with distinct densities, coupled via electromechanical interaction through immersed blades connected to DC motors.
- Implementing a method to zero the energy flux between the granular gas subsystems.
- Analyzing the fluctuations of the energy flux, focusing on asymmetry and intermittency.
Main Results:
- An immersed blade serves as a viable tool for assessing granular gas properties when motor dissipation is accounted for.
- Energy flux fluctuations between granular gases of different densities are asymmetric, highly intermittent, and most probable at zero.
- The primary characteristics of energy exchange in weakly coupled systems can be elucidated by considering subsystem fluctuations.
Conclusions:
- Electromechanical coupling provides a sensitive method for studying granular gas interactions and properties.
- The immersed blade technique offers a practical approach for granular gas characterization, with careful consideration of system dissipation.
- Understanding fluctuations is key to explaining energy transfer dynamics in coupled granular gas systems.
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