Sedimentation and fluidisation: Part I

Richardson, John F.; Zaki, W.N.

doi:10.1016/s0263-8762(97)80006-8

Cited by 827 publications

(953 citation statements)

References 0 publications

Supporting

Mentioning

860

Contrasting

Unclassified

Order By: Relevance

“…Lift force plays a central role in the suspension of particles in channel flows. Joseph (2001) proposed that ideas analogous to the Richardson-Zaki (1954) correlation must come into play in problems of slurries, where the particles are fluidized by lift rather than by drag. The problems of fluidization by lift can be decomposed into two separate types of study: (1) single particle studies in which the factors that govern lifting of a heavier-than-liquid particle off a wall by a shear flow are identified and (2) many particle studies in which cooperative effects on lift-off are investigated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Power law correlations for sediment transport in pressure driven channel flows

Patankar

Joseph

Wang

et al. 2002

International Journal of Multiphase Flow

114

View full text Add to dashboard Cite

Lift forces acting on particles play a central role in many cases, such as sediment transport, proppant transport in fractured reservoirs, removal of drill cuttings in horizontal drill holes and cleaning of particles from surfaces. We study the problem of lift using 2D direct numerical simulations and experimental data. The lift-off of single particles and many particles in horizontal flows follow laws of similarity, power laws, which may be obtained by plotting simulation data on log-log plots. Data from slot experiments for fractured reservoirs is processed (for the first time) on log-log plots. Power laws with a parameter dependent power emerge as in the case of Richardson-Zaki correlations for bed expansion by drag.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Models for drag and lift forces on the particles must be used for fluidproppant interaction. Models for the drag force on particles in solid-liquid mixtures is a complicated issue and usually rely on the well-known Richardson-Zaki (1954) correlation.…”

Section: Introductionmentioning

confidence: 99%

Power law correlations for sediment transport in pressure driven channel flows

Patankar

Joseph

Wang

et al. 2002

International Journal of Multiphase Flow

114

View full text Add to dashboard Cite

show abstract

“…Figure 4 presents the influence of increasing biomass concentration on the expansion behavior characterized by the slope value n and the settling velocity u i . In contrast to the theoretical considerations by Richardson and Zaki (1954), u i is in our case, not representing the Stokes settling velocity but an extrapolated value for an average settling velocity of a single adsorbent particle under the given fluidphase conditions and the implications arising from biomass/adsorbent interactions. It thus provides an indication on the influence of the biomass-containing feedstock on the actual expansion behavior.…”

Section: Expansion Behaviormentioning

confidence: 85%

“…). theoretical prediction of the expansion behavior developed by Richardson and Zaki (1954) is not applicable to EBA systems in general, and in particular, not to any systems containing biomass.…”

Section: Expansion Behaviormentioning

confidence: 97%

See 1 more Smart Citation

The influence of biomass on the hydrodynamic behavior and stability of expanded beds

Lin

Thömmes

Kula

et al. 2004

Biotech & Bioengineering

View full text Add to dashboard Cite

Expanded bed adsorption is an innovative chromatographic technology that allows the introduction of particle-containing feedstock without the risk of blocking the bed. Provided a perfectly classified fluidized bed (termed expanded bed) is formed in the crude feedstock and the biomass is not influencing protein transport towards the adsorbent surface, a sorption performance comparable to packed beds is found. The influence of biomass on the hydrodynamic stability of expanded beds is essential and was investigated systematically in this article. Residencetime distribution analyses were performed using model systems and a yeast suspension under various fluid-phase conditions. It is demonstrated that three factors (biomass/ adsorbent interactions, biomass concentration, and flow rate) play an interdependent role disturbing the classified fluidization of an expanded bed. A clear correlation between the degree of aggregative fluidization-obtained by PDE modeling of RTD data-and the expansion behavior of the fluidized bed has been found. Thus, combining three analytical methods, namely cell transmission index analysis, expansion analysis, and RTD analysis provides a solid base for understanding and control of the fluidization behavior and thus further process design during the initial phase of process development. B 2004 Wiley Periodicals, Inc.

show abstract

An experimental model of biofilm detachment in liquid fluidized bed biological reactors

Nicolella

Felice

Rovatti

2000

Biotechnol. Bioeng.

View full text Add to dashboard Cite

Dimensional analysis was applied for the description of biofilm detachment in liquid fluidized bed biological reactors. This technique allowed the identification of the significant parameters influencing detachment mechanisms and suggested suitable experiments for the characterization of involved phenomena. The influence of the significant variables was established on a lab‐scale reactor and an empirical model was proposed to correlate experimental results. The detachment rate was strongly dependent on liquid velocity, while the influence of other parameters, such as solid hold‐up and liquid shear stress, was found to be less important.

show abstract

Sedimentation and fluidisation: Part I

Cited by 827 publications

References 0 publications

Power law correlations for sediment transport in pressure driven channel flows

Power law correlations for sediment transport in pressure driven channel flows

The influence of biomass on the hydrodynamic behavior and stability of expanded beds

An experimental model of biofilm detachment in liquid fluidized bed biological reactors

Contact Info

Product

Resources

About