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Fluidization of cylinder particles in a fluidized bed
Advanced Powder Technology, 2017Abstract An experimental study of the flow regimes and transitions in a fluidized bed (cross-section of 200 mm × 200 mm and height of 2000 mm) containing a mixture of cylindrical particles and silica sand is carried out. Six different flow regimes are identified: fixed bed (F), bubbling fluidization (B), transition fluidization (T), partial ...
Xi Chen +2 more
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Fluidization and Fluidized Bed
2019This chapter introduces a multiscale method for modeling gas–solid flows, from steady-state modeling for quick engineering design, continuum model for industrial scale reactor simulation, discrete particle method for lab-scale reactor simulation to direct numerical simulation for exploring the underlying mechanics.
Xinhua Liu +5 more
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Fluidization of nanoagglomerates in a rotating fluidized bed
AIChE Journal, 2006AbstractAgglomerates of nanoparticles were fluidized in a rotating fluidized bed (RFB) system at different rotating speeds corresponding to 10, 20, 30 and 40 times the gravity force (9.8 m/s2). The powders, fumed silica Aerosil® R974, Aerosil® R972 and Aeroxide® TiO2 P25, with a primary particle size of 12, 16 and 21 nm, respectively, form micron sized
Jose Quevedo +5 more
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On partial fluidization in rotating fluidized beds
AIChE Journal, 1987In a rotating fluidized bed, unlike in a conventional fluidized bed, the granules are fluidized layer by layer from the (inner) free surface outward at increasing radius as the gas velocity is increased. This is a very significant and interesting phenomenon and is extremely important in the design of these fluidized beds.
J. Kao, R. Pfeffer, G. I. Tardos
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Sound assisted fluidization of nanoparticle agglomerates
Powder Technology, 2004 This paper presents some preliminary observations on sound-assisted fluidization of hydrophobic fumed silica nanoparticles (Degussa AerosilR R974, having a primary particle size of 12 nm) in the form of large 100 -400 Am agglomerates. The effect of sound
Rajesh Dave, Chao Zhu, Robert Pfeffer
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Fluidization And Fluidized Beds
2019One of the most unusual types of equipment used by chemical engineers is the fluidized bed, a device in which solid particles, for example sand or catalyst particles, are made to behave like elements of a fluid, and hence are “fluidized”. The state of being fluidized, called “fluidization”, turns out to be advantageous for a number of important ...
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Fluidization Phenomena and Fluidized Bed Technology
1997The term fluidization is used to designate the gas-solid contacting process in which a bed of finely divided solid particles is lifted and agitated by a rising stream of process gas. At the lower end of the velocity range, the amount of lifting is slight, the bed behaving like a boiling liquid (hence the term boiling bed).
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Powder Technology, 1993
Abstract Entrainment of silicon fines mixed with large silicon nitride particles and mixed with large silicon particles wasmeasured. A model is proposed to account for attrition and elutriation based on the assumption that the fine powder is in one of three forms: (a) elutriable freely moving fines, (b) agglomerates of fines, (c) fines attached to ...
Yao-Dian Liu, Shoichi Kimura
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Abstract Entrainment of silicon fines mixed with large silicon nitride particles and mixed with large silicon particles wasmeasured. A model is proposed to account for attrition and elutriation based on the assumption that the fine powder is in one of three forms: (a) elutriable freely moving fines, (b) agglomerates of fines, (c) fines attached to ...
Yao-Dian Liu, Shoichi Kimura
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Surface dynamics of fluidized beds and quality of fluidization
AIChE Journal, 1958AbstractSolutions of linearized Navier‐Stokes equations have been developed for the motion of arbitrary two‐dimensional waves occurring at any interface between the emulsion phase of a fluidized bed and the particle‐free, fluid phase. In all cases for which the bed particles are denser than the fluidizing fluid the solutions showed that the lower ...
W. J. Rice, R. H. Wilhelm
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Homogeneous Fluidization Characteristics of Vibrating Fluidized Beds
The Canadian Journal of Chemical Engineering, 2004AbstractThe effects of vibration parameters, operating conditions and material properties on fluidization quality were investigated by the measurement and analysis of voidage fluctuation signals in a vibrating fluidized bed with a diameter of 148 mm. The fluctuation deviation of the bed voidage and the enhancement index of the bed derived can describe ...
Haibo Jin +3 more
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