Statistics of a 2D immersed granular gas magnetically forced in volume

Abstract

We present an experimental study of the dynamics of a set of magnets within a fluid in which a remote torque applied by a vertical oscillating magnetic field transfers angular momentum to individual magnets. This system differs from previous experimental studies of granular gas where the energy is injected by vibrating the boundaries. Here, we do not observe any cluster formation, orientational correlation and equipartition of the energy. The magnets' linear velocity distributions are stretched exponentials, similar to 3D boundary-forced dry granular gas systems, but the exponent does not depend on the number of magnets. The value of the exponent of the stretched exponential distributions is close to the value of 3/2 previously derived theoretically. Our results also show that the conversion rate of angular momentum into linear momentum during the collisions controls the dynamics of this homogenously-forced granular gas. We report the differences between this homogeneously-forced granular gas, ideal gas, and nonequilibrium boundary-forced dissipative granular gas.

References in corpus (23)

• Breakdown of Energy Equipartition in a 2D Binary Vibrated Granular Gas
• The Granular Phase Diagram
• Velocity statistics in excited granular media
• Velocity Distributions & Density Fluctuations in a 2D Granular Gas
• Mechanisms in the size segregation of a binary granular mixture
• Non-Gaussian velocity distributions in excited granular matter in the absence of clustering
• The Inelastic Maxwell Model
• Velocity distribution of a homogeneously driven two-dimensional granular gas
• Rotationally driven gas of inelastic rough spheres
• Violation of Molecular Chaos in dissipative gases
• Crucial role of sidewalls in velocity distributions in quasi-2D granular gases
• Segregation in granular binary mixtures: Thermal diffusion
• Collision statistics in a dilute granular gas fluidized by vibrations in low gravity
• Equipartition of rotational and translational energy in a dense granular gas
• Geometry-induced asymmetric diffusion
• Assessing a Hydrodynamic Description for Instabilities in Highly Dissipative, Freely Cooling Granular Gases
• Thermal diffusion segregation in granular binary mixtures described by the Enskog equation
• Orientational correlation and velocity distributions in uniform shear flow of a dilute granular gas
• Equation of state of a granular gas homogeneously driven by particle rotations
• Statistical Equilibrium of Large Scales in Three-Dimensional Hydrodynamic Turbulence
• Particle kinematics in a dilute, 3-dimensional, vibration-fluidized granular medium
• Dissipated power within a turbulent flow forced homogeneously by magnetic particles
• Three-dimensional turbulence generated homogeneously by magnetic particles