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Characterization of the Quality of Slugging Regime in Fluidized Beds by Means of Two Capacitance Probes by A. Lancia; R. Nigro; L. Santoro; G. Volpicelli is a Engineering article available to read on EtoBox.

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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. Inparticular, 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 ofvalues; the width of the range and the distribution ofvalues 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. NOMENCLATURE D column diameter [m] dp average particle diameter [,um] P operating pressure [MPa] U gas flow rate [m s-'] onset velocity ofthe transition from slugging to turbulent regimes [m s-'] Uo minimum gas flow rate fluidization [m s-'J Uk endvelocity of the transition from slugging to turbulent regimes [m s-'] V velocity of single slug [ms-'] Vm mean slug velocity [m s-'] e average void fract

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Author

A. Lancia; R. Nigro; L. Santoro; G. Volpicelli

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-8831)

Published

1991

Language

EN

Field

Engineering (Physical Sciences)