Fluidization of powders showing degrees of cohesiveness—I. Bed expansion

Bubbling and Bed Expansion Behavior Under Vibration in a Gas-Solid Fluidized Bed

“…The value of n/4.65 is about 3 at K = 0 for 60 lm powder and that value indicates that only small effects of interactions between particles or between particles and bed wall are present. However, such a value of n/4.65 is within the range of noninteraction between particles (group A) in Geldart's report [15]. For 30 lm powder, the effects of interaction appear to be significant for the small vibration strengths.…”

“…Although the bubble formation was not observed for 6 lm powder, the channel breakage by vibration was observed above the gas velocity of u cha . Geldart used the index, n/4.65, to evaluate the degree of interaction forces between particles [15]. The index, n/4.65, was based on the Eq.…”

A drag force closure for uniformly dispersed fluidized suspensions

“…To make a comparison between them, we operate as follows. For a generic Geldart Group A powder(Geldart, 1973) fluidized by means of liquid or gas, we assign the superficial velocity of the fluid and we calculate the corresponding value of the suspension void fraction ε R&Z yielded by Eq. (2.7).…”

Physical properties of constitutive size classes of spray-dried skim milk powder and their mixtures

“…Physical properties were obtained using a methodology derived from the behaviour testing procedures of Carr [3][4][5] with a powder flow analyser (Micrometrics Laboratory, Hosokawa, Japan) recommended by other authors [7,15] as an analyser with good reproducibility. The parameters measured included calculated Hausner ratio, calculated compressibility, angles of fall, repose and difference, angle of spatula, and flowability and floodability indices (the last two included in the scale [0-100]).…”