Rheological and fluidization behaviour of powders of different particle size distribution

Khoe, G.K.; Ip, Tomlinson; Grace, John R.

doi:10.1016/0032-5910(91)80094-y

Cited by 51 publications

(27 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been found from experiments 7 that a broader particle size distribution leads to more particles inside the dilute phase, which helps reduce the bubble size. This result is consistent with the collapse tests by Khoe et al,14 who reported that for a given average surface-volume diameter, a wide size distribution gives a greater air retention capacity than a bimodal distribution, which in turn gives greater retention than a narrow distribution. Also, Beetstra et al 9 noticed that more solids rain through the bubbles in the case with fines.…”

Section: Introductionsupporting

confidence: 93%

“…With the porosity of the dense phase increased, it leads to more interstitial gas passing through the dense phase at the expense of the bubble phase. 3 However, separate experiments by Khoe et al 14 and Saayman et al 1 both showed that the porosity of the dense phase is decreased with the addition of fines. It has been found from experiments 7 that a broader particle size distribution leads to more particles inside the dilute phase, which helps reduce the bubble size.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Numerical studies of the effects of fines on fluidization

Özel

Sundaresan

2016

AIChE Journal

View full text Add to dashboard Cite

Euler-Lagrange simulations of fluidized beds of Geldart Group A particles containing different levels of fines are performed in periodic domains with various domain-averaged solid volume fractions. Bubble-like voids readily form when no fines are added. Introducing fines does not reduce bubble sizes if van der Waals force between particles is not accounted for. In contrast, the addition of van der Waals force produces significant changes. With no fines, bubbles are found to be suppressed at sufficiently high solid volume fractions, corresponding to the expanded bed regime for Group A particles. With the addition of fines, bubbles can be suppressed at lower solid volume fractions. With more fines added, bubbles can be suppressed at even lower solid volume fractions. When bubbles are suppressed, the system is found to be in a stable solid-like regime. In this regime, forces on each particle are balanced, and the particle velocity fluctuations are dampened.

show abstract

Section: Introductionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 97%

Numerical studies of the effects of fines on fluidization

Özel

Sundaresan

2016

AIChE Journal

View full text Add to dashboard Cite

show abstract

“…The reduction of inter-face adsorption of boehmite reaches a plateau. Though only active forces between host particles by the addition of limited data are shown here, the general validity of this fines has also been observed in powders ( 11 ) .…”

Section: Methodsmentioning

confidence: 56%

Rheological and Solid–Liquid Separation Properties of Bimodal Suspensions of Colloidal Gibbsite and Boehmite

Bruinsma

Wang

et al. 1997

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…By collapsing analysis, the properties of the emulsion and bubble phases in a bubbling fluidized bed can be obtained, that is, the emulsion voidage, the apparent gas velocities of emulsion and bubble phases, and the volumetric fraction of bubble phase (Rowe et al, 1986;Kwauk, 1983;Khoe et al, 1991). More importantly, estimation of the fluidizing characteristics of particles can be made by using the collapsing test (Geldart et al, 1985;Jean et al, 1992).…”

Section: Introductionmentioning

confidence: 99%