Results 241 to 250 of about 25,393 (297)
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Dynamic waves in fluidized beds
Powder Technology, 1995Abstract Published results on the velocity of propagation and the change of amplitude of dynamic waves in fluidized beds are reviewed and re-evaluated. A distinction is drawn between pressure waves and solids concentration waves. Over the range of frequencies of interest in fluidized beds, predictions of the velocity of compression waves by pseudo ...
D. MUSMARRA +3 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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Bed Expansion – Extending Correlations for Fluidized Beds with Inserts to Open Fluidized Beds
Chemical Engineering & Technology, 2007AbstractBed expansion occurs during the operation of gas‐fluidized beds and is influenced by particle properties, gas properties and distributor characteristics. It has a significant bearing on heat and mass transfer phenomena within the bed. A method of predicting bed expansion behavior from other fluidizing parameters would be a useful tool in the ...
M. C. Leaper, N. Hilal
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Design of fluidized‐bed fermentors
Biotechnology and Bioengineering, 1986AbstractDesigning a fluidized‐bed bioreactor requires choosing the best support particle (if any). Effectiveness factors (proportional to reactor volumetric productivity) are derived for flocs, solid spherical supports, porous supports, and adsorbent supports.
G F, Andrews, J, Przezdziecki
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Design of a fluidized bed scrubber
Industrial & Engineering Chemistry Process Design and Development, 1985Current design of the fluidized bed scrubber (FBS), otherwise known as the Turbulent Contact Absorber or the Mobile Bed Contactor, is based on experience and rules of thumb. In this paper published equations on hydrodynamics and mass transfer are reviewed. From the equations a logical design procedure for the FBS Is proposed.
Visvanathan C., Leung L.S.
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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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Dynamics of a shallow fluidized bed
Physical Review E, 1999The results of the experimental study of the dynamics of a shallow fluidized bed are reported. The behavior of granular material is controlled by the interplay of two factors--levitation due to the upward airflow, and sliding back due to gravity. Near the threshold of instability, the system shows critical behavior with remarkably long transient ...
L S, Tsimring, R, Ramaswamy, P, Sherman
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Biological denitrification in a fluidized bed
Biotechnology and Bioengineering, 1984AbstractA fluidized bed biofilm reactor using sand as the carrier particle was employed to study the effects of superficial velocity on the removal of nitrates as well as on the growth of the biofilm. Velocity was found to affect significantly both nitrate removal and biofilm growth.
NARJARI, NK, KHILAR, KC, MAHAJAN, SP
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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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Influence of Fluidization Velocity on Bed Defluidization in Fluidized Bed Combustors
18th International Conference on Fluidized Bed Combustion, 2005Effects of superficial gas velocity and bed particle size on bed defluidization during biomass combustion were investigated. Sampled bed particles from four different large-scale circulating- and bubbling fluidized bed combustors, using biomass as fuel, were collected and analyzed.
Mohammad R. Golriz +4 more
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