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Prediction of minimum fluidization velocity
1997Any feasible prediction of fluidized bed heat transfer must start with the prediction of its onset, i. e. with the prediction of the minimum fluidization velocity. Furthermore, as will be shown in Chapter 7, the correlation for the prediction of bubbling fluidized heat transfer will contain minimum fluidization velocity instead of particle size, i.
O. Molerus, K.-E. Wirth
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Determining minimum fluidization velocity in magnetized fluidized bed with Geldart-B particles
Powder Technology, 2021Abstract This work aimed to solve the controversies about defining and determining the minimum fluidization velocity (Umf) in the magnetized fluidized bed (MFB). It should be defined rigorously from the physics behind the secondary phenomena such as bed pressure drop and particle motion.
Quanhong Zhu, Libo Zhang, Weikang Hao
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Effect of pressure on minimum fluidization velocity
Journal of Thermal Science, 2007Minimum fluidization velocity of quartz sand and glass bead under different pressures of 0.5, 1.0, 1.5 and 2.0 MPa were investigated. The minimum fluidization velocity decreases with the increasing of pressure. The influence of pressure to the minimum fluidization velocities is stronger for larger particles than for smaller ones.
Zhu Zhiping, Na Yongjie, Lu Qinggang
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Prediction of the minimum fluidization velocity
Powder Technology, 1994Abstract The use of equations of the Ergun form to correlate minimum fluidizing velocity is examined. For particle Reynolds numbers greater than 5, a linearized fitting procedure gives a good approximation to available data. However, the results for lower Reynolds numbers are shown to reveal variations in void function and particle sphericity.
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Minimum fluidization velocities of wet coal particles
Industrial & Engineering Chemistry Research, 1988Minimum fluidization velocities of wet lignite coal beds were measured. The experiments were carried out in an 8.5 x 10/sup -2/ m i.d. column with particles of average size ranging from 0.15 x 10/sup -3/ to 4.25 x 10/sup -3/m, using air as a fluidizing gas. The experimental results were compared to the values predicted by commonly used correlations. On
Jaroslav Pata +3 more
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Minimum fluidization velocity at elevated temperature in tapered fluidized bed
Chemical Engineering and Processing: Process Intensification, 2008Very little data of minimum fluidization velocity at elevated temperatures of tapered bed are available in the literature. This study was undertaken to provide some data under elevated temperature conditions in tapered bed. Data on minimum fluidization velocity have been obtained experimentally for temperature up to 800 °C in case of 0.5 mm diameter of
D.C. Sau, Swati Mohanty, K.C. Biswal
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Minimum fluidizing velocities for coal in air
The Canadian Journal of Chemical Engineering, 1958AbstractThis paper reviews the methods which have been proposed for evaluating the lower limit of velocity for which a fluidized bed of solids will be stable. Experimental tests for determining the minimum fluidizing velocity have been obtained for nine narrowly sized coal samples ranging from 0.0099 to 0.224 in.
C. G. Sinclair, D. B. Robinson
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Prediction of Minimum Fluidization Velocity in Three-Phase Fluidized-Bed Reactors
Industrial & Engineering Chemistry Research, 1999Knowledge of the onset of fluidization is of considerable relevance and the key to three-phase fluidized-bed reactors design and safe operation. Accordingly, using a wide historic ULmf database set up from the open literature, all the quantification methods proposed to predict the minimum fluidization liquid velocity in three-phase fluidized beds have ...
Faïçal Larachi +3 more
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Minimum fluidization velocities in beds of mixed solids
The Canadian Journal of Chemical Engineering, 1978AbstractThe fluidization behaviour of a bed of solids of mixed sizes and/or densities indicates that for a range of velocities between ubf (the velocity of beginning of fluidization) and utf (the velocity of complete fluidization), such a bed is only partially fluidized.
R.P. Vaid, P. Sen Gupta
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Minimum fluidization velocities for gas–solid 2D beds
Chemical Engineering and Processing: Process Intensification, 2002Abstract The purpose of this study is to present some new data to estimate minimum fluidization velocity (umf) in a two-dimensional bed. When investigating fluidodynamics with a fluidized bed, a fixed normalised parameter is needed. This parameter stands for the degree of mixing and its outcome between the phases.
Guadalupe Ramos Caicedo +3 more
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