Abstract
Measurements of bubble velocities, dimensions and flow rates in a two-dimensional fluidized bed by a dual electrical capacitive probe are compared with measurements from cine photography; the cine photographs and electric measurements were taken at the same point in a fluidized bed and at the same time. It was found that both sets of measurements were in agreement only when the conditions of electrical measurement were arranged to exclude spurious signals, while still retaining sensitivity, and when the theory of measurement included the effects of bubble retardation and distortion, and allowed for the stochastic incidence between the bubble front and the probes.
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