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Characterization of the quality of slugging regime in fluidized beds by means of two capacitance probes

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Two capacitance probes have been used to acquire signals that, when properly analysed, allow us to determine characteristic parameters of the slugging regime. In particular, a new parameter, the fraction of unchanged slugs (FUS) linked to the quality of fluidization in the slugging regime has been defined and evaluated. It has also been found that, in the same working conditions, slug velocities measured on single slugs vary within a range of values; the width of the range and the distribution of values inside the range depend on the gas velocity. Minimum dispersion of slug characteristics is obtained when a higher quality of fluidization is reached in the bed. This condition corresponds to the value of gas velocity equal to Uc, the onset of the transition from slugging to turbulent regime.

Affiliations: 1: Dipartimento di Ingegneria Chimica, Università di Napoli P. le V. Tecchio, 80125 Napoli, Italy; 2: Dipartimento di Chimica, Università di Napoli Via Mezzocannone 4, 80132 Napoli, Italy


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