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- W1523365189 abstract "Pressure time data for binary mixtures of silica sand have been examined with particular reference to correlation between mean particle size, standard deviation and parameters obtained through attractor reconstruction techniques. The ratio of total variance to high speed variance is a particularly useful parameter for regime identification. INTRODUCTION At superficial velocities greater than the minimum fluidizing velocity, Umf, the amplitude of fluctuations in the pressure drop across a bubbling fluidized bed increases as superficial velocity increases and is proportional to the difference between superficial velocity, U, and minimum fluidizing velocity (1). Puncochar et al (2) have used the apparent linear proportionality between bed pressure drop standard deviation, σp, and U as the basis of a method for determining Umf but recommend the method be restricted to Rep<30 and U<2.5 Umf, as outside these bounds the relationship between σp and U was non-linear. Davies and Fenton (3) showed that σp measurements could potentially provide a means for direct monitoring of mean particle size in a bubbling bed, and Davies et al (4) estimated mean particle size using an expression that follows from the premise that σp is linearly proportional to (U ─ Umf) using a data set for which this condition was satisfied. However they reported that estimates of Umf obtained from σp measurements, Umfσ, were larger than, Umf∆P, obtained from the Ergun equation and bed pressure drop measurements (5) and also noted that below Umfσ, σp, though very small, rose to a maximum value before decreasing and then increasing rapidly as an apparently linear function of U. This observation in particular and the difference between the values of Umfσ and Umf∆P has prompted us to re-examine the data used by Davies et al (4). 1 Davies et al.: Particle Size Estimation and Monitoring in a Bubbling Fluid Bed Published by ECI Digital Archives, 2007 DAVIES, KROUSE, TAUPO 466" @default.
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- W1523365189 date "2007-01-01" @default.
- W1523365189 modified "2023-09-24" @default.
- W1523365189 title "Particle Size Estimation and Monitoring in a Bubbling Fluidized Bed Using Pressure Fluctuation Measurements" @default.
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