Abstract
Gas viscosity plays a fundamental role on enhancing the fluid-like behavior of gas-fluidized beds of fine powders and an increase of gas viscosity may even lead to a suppression of the bubbling regime as seen in a previous chapter. In this chapter, further experimental observations are reviewed on the effect of gas viscosity on the macroscopic and mesoscopic behavior of gas-fluidized beds ruled by dynamic aggregation. Nevertheless, the size of dynamic aggregates, as predicted by theory, is not affected by gas viscosity. This is confirmed by means of direct visualization experiments of aggregates and aggregate size estimations from bed expansion data.
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