Estimation of hydrodynamic nonuniformities in fluidized bed reactors using the potential-flow model for incompressible fluids

Chernyakov, A. V.; Volynetz, A. Z.; Melamed, Leo; Tselikov, V. A.

doi:10.1134/s0040579508020048

Theor Found Chem Eng

2008

DOI: 10.1134/s0040579508020048

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Estimation of hydrodynamic nonuniformities in fluidized bed reactors using the potential-flow model for incompressible fluids

A. V. Chernyakov

A. Z. Volynetz

Leo Melamed

et al.

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Cited by 3 publications

(3 citation statements)

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“…The degree of irregularity in a velocity field where solid-phase particles are in motion within a vessel can be evaluated, however, proceeding from analysis of the velocity field of the potential flow of an incompressible liquid within a vessel [8,9]. To assess how one design would function "better" than another, therefore, it is possible to use a model of the potential flow of a non-viscous incompressible fluid.…”

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Scaling-up for construction of heat-and mass-exchange vessels

Chernyakov

2008

Chem Petrol Eng

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It is noted that the creation of a uniform hydrodynamic field within the space of a vessel in the making is a critical component in the solution of the scale-up problem. The method of comparing the configurations of vessel designs with respect to their effect on the uniformity of their internal hydrodynamic field is examined. The method is based on assessment of irregularities in the velocity field of the potential flow of an incompressible liquid in a vessel. The method is illustrated by comparing several gas distributors used in fluidization equipment.The term "scaling-up" has been known for approximately half a century, while currently, the subject also remains one of the most urgent in the field of the building of heat-and mass-exchange vessels.The transition from laboratory to experimental, and from experimental to industrial vessels is accompanied, as a rule, by degradation of indicators of chemical-engineering processes (the extent to which the raw material is transformed, the composition of the final products, specific output, energy outlays, etc.).The scale-up factor (SUF), which has often been more than ten, is used to assess characteristics of a newly constructed device as compared with characteristics of prototype devices. In the petroleum industry [1], for example, plate-type extraction towers with a diameter of 3 m and height of 30 m have had 5-6 theoretical stages of separation, i.e., their height, which is equivalent to the height of the theoretical degree of separation (HTDS), has amounted to 5-6 m, whereas on laboratory towers, the HTDS has been about 0.5 m (SUF of approximately 10).The scale-up problem also arises under conditions where there is no heat and mass exchange in a form characteristic of the majority of devices employed in the chemical industry. For rational sublimation drying of a thermally unstable material in the foodstuff branch of industry, the rate of the process is determined by the density of the radiation flux impinging on the material being dried. Moreover, the power of the emitter is regulated so that the temperature on the surface of the material does not exceed a certain allowable value. In the laboratory, the drying of a product 10 mm thick may have been completed in 45-50 min, but 10-12 h is required in an industrial unit [2]. In that case, the SUF has amounted to about 15.The modern definition of scale-up is the "development of vessels with dimensions and outputs exceeding those of previously investigated prototypes" [3]. If attention is turned to the fact that the laboratory device is the first prototype, building of the majority of new vessels is inevitably associated with scaling-up.

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“…Let us compare these four distributors with respect to the formation of slow-moving and stagnant zones. The procedure used for the comparison is based on results presented in [8,9].…”

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Scaling-up for construction of heat-and mass-exchange vessels

Chernyakov

2008

Chem Petrol Eng

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The approximated composition and decomposition of spatial flows

Chernyakov¹

2010

Theor Found Chem Eng

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Methods of localization in hydrodynamics of complex systems

Melamed¹,

Tropkina²

2013

Theor Found Chem Eng

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Estimation of hydrodynamic nonuniformities in fluidized bed reactors using the potential-flow model for incompressible fluids

Cited by 3 publications

References 1 publication

Scaling-up for construction of heat-and mass-exchange vessels

Scaling-up for construction of heat-and mass-exchange vessels

The approximated composition and decomposition of spatial flows

Methods of localization in hydrodynamics of complex systems

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