Results 211 to 220 of about 838 (262)
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Evaluation of correlations for minimum fluidization velocity (U) in gas-solid fluidization
Powder Technology, 2018Abstract The minimum fluidization velocity (Umf), defined as the superficial gas velocity at which the drag force of the upward moving gas becomes equal to the weight of the particles in the bed, is one of the most important parameters associated with a fluidized bed system.
Jia Wei Chew, Ray Cocco
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Chemical Engineering Science, 1996
The hydrodynamical behaviour of fluidized beds at reduced pressures is studied. The minimum fluidization velocity is strongly influenced by pressure, decreasing as pressure increases. The well-known equation of Wen and Yu and two equations proposed for the calculation of umf at reduced pressures are tested; the comparison with experimental data shows ...
Josep Arnaldos
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The hydrodynamical behaviour of fluidized beds at reduced pressures is studied. The minimum fluidization velocity is strongly influenced by pressure, decreasing as pressure increases. The well-known equation of Wen and Yu and two equations proposed for the calculation of umf at reduced pressures are tested; the comparison with experimental data shows ...
Josep Arnaldos
exaly +2 more sources
Prediction of the minimum fluidization velocity
Powder Technology, 1993Abstract Relations to determine the minimum fluidization velocity (umf) are tested statistically with 80 measurements reported in the literature on 20 different substances. All relevant relations (33 equations) can be reformulated as dimensions correlations in which the state of the fluidized bed is determined by the parameter Ar/Remf.
Bernard C. Lippens, Jan Mulder
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Minimum fluidization velocity and bed expansion of the inverse fluidized bed
Particulate Science and Technology, 2023To define the fluid-dynamic properties of inverse fluidized beds, studies of the minimum fluidization velocity and bed expansion were performed in this work. The experiments were performed in an inverse fluidized bed of polypropylene and polystyrene particles in a cylindrical column using water and an aqueous glycerol solution of different ...
Šućurović, Katarina +4 more
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An Experimental Study on the Determination of Minimum Fluidization Velocity
Bayburt Üniversitesi Fen Bilimleri Dergisi, 2023Pneumatic conveying systems are widely used in a variety of industrial settings since different types of materials can be conveyed. There are some classifications of flow modes for conveying of powders and bulk solid particles based on mean particle size, density, and inter particle cohesion forces.
Alperen TOZLU +2 more
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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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Minimum Fluidization Velocity of Fine Particles
Materials Science Forum, 2008The minimum fluidization velocity is an important parameter in the design and operation of an industrial unit of fluidization. In the present work the minimum fluidization velocities of fine particles were obtained through two experimental methodologies.
Cássia Regina Cardoso +2 more
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Influence of pressure on the minimum fluidization velocity
Chemical Engineering Science, 1991The influence of pressure on minimum fluidization velocity has been measured in a pressurized fluidized bed. Three different bed materials, corresponding to Geldart's group B or group D particles, were investigated at pressures between 0.1 and 1.6 MPa. The onset of fluidization was determined both visually and by pressure drop measurements. The results
P.A. Olowson, A.E. Almstedt
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Minimum fluidization velocity of binary mixtures
The Canadian Journal of Chemical Engineering, 1989AbstractThe fast defluidization method was used to measure the minimum fluidization velocities of binary systems. Based on the experimental data obtained from the published literature and from this work, different correlations used for predicting the minimum fluidization velocities of binary systems were evaluated and compared.
Chien‐Song Chyang +2 more
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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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