Pressure fluctuations as a diagnostic tool for fluidized beds. Technical progress report, October 1, 1995--December 30, 1995
Description: Experimentation was conducted to determine the nature of bubbling fluidized bed (BFB) pressure fluctuations. The goal of the experiments was to explain the physical phenomena that governs the structure of pressure fluctuations. A study of the effect of the differential pressure tap spacing was conducted. The results confirmed the hypothesis that spatial aliasing can significantly distort expected fluctuation structure. The behavior of bubbling bed fluctuations was compared to previously published theories that predicted the natural frequency of incipiently fluidized beds. A modified theory was derived for fluidized systems which better predicts the observed frequency in shallow fluidized beds. This theory not only predicts the natural frequency of bed oscillations, but also explains the second order system behavior observed in bubbling fluidized bed Bode plots. The effect of bubble coalescence in deep bed acts both to decrease the frequency of bed oscillations and to complicate the observed frequency response with multiple peaks.
Date: January 15, 1996
Creator: Brown, R.C.
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