Temperature-pressure scaling for air-fluidized grains on approaches to Point J

Details Temperature-pressure scaling for air-fluidized grains on approaches to Point J Temperature-pressure scaling for air-fluidized grains on approaches to Point J

2011-10-25

arxiv.org/abs/1110.5611v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We present experiments on a monolayer of air-fluidized beads in which a jamming transition is approached by increasing pressure, increasing packing fraction, and decreasing kinetic energy. This is accomplished, along with a noninvasive measurement of pressure, by tilting the system and examining behavior vs depth. We construct an equation of state and analyze relaxation time vs effective temperature. By making time and effective temperature dimensionless using factors of pressure, bead size, and bead mass, we obtain a good collapse of the data but to a functional form that differs from that of thermal hard-sphere systems. The relaxation time appears to diverge only as the effective temperature to pressure ratio goes to zero.

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