Abstract
The effect of granular pressure on the fluctuation of the granular volume fraction is investigated experimentally in a gas–solid flow system. Granular compressibility, defined by the response of granular volume fractions in granular pressure, is also measured. It is found that there exists a critical granular pressure beyond which the transition from the coexistence of a liquid-like granular phase and a gas-like granular phase to homogenous granular fluids takes place. The transition from a heterogenous to homogenous granular phase is characterized by an abrupt change in the granular compressibility. To describe the characteristic change in compressibility, a granular hydrostatic model is formulated by considering both collisional and non-collisional interactions. The model predictions agree well with experimental results.
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