Local porosity in conical spouted beds consisting of solids of varying density

José, María; Olazar, Martı́n; Álvarez, Sonia; Morales, Alberto Angulo; Bilbao, Javier

doi:10.1016/j.ces.2004.12.004

Cited by 33 publications

(27 citation statements)

References 29 publications

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“…This leads to a decrease in the interactions between particles in the annulus, and therefore, to an increase of v an (see Figure ). Moreover, H 0 has an influence on the dimensions of the annulus (see Figure ) but, as it is well known that the porosity is relatively homogeneous in the annulus region, H 0 has therefore no significant influence on the interactions between the particles therein, and then no significant influence on v an (see Figure ).…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation of solid particles flow in a conical spouted bed using radioactive particle tracking

et al. 2015

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in Wiley Online Library (wileyonlinelibrary.com)Solid particles flow in a conical spouted bed is characterized by radioactive particle tracking. The influence of operating conditions on key parameters of this flow is evaluated and discussed: the morphology of the solid bed is not strongly influenced by the forces exerted by the gas on the solid particles, but rather by geometrical considerations; the particles spend approximately 8% of their time in the spout in all experiments; it is the force exerted on the solid particles by the gas that directly controls the volumetric flow rate between adjacent regions, and not the amount of particles in the bed; as U/U ms increases, the volume of solid particles in the annulus decreases, the volume of solid particles in the fountain increases and the volume of solid particles in the spout remains constant. Correlations to predict key flow parameters as functions of operating conditions are also established and discussed. V C 2015 American Institute of Chemical Engineers AIChE J, 62: 26-37, 2016 Figure 1. Specific parameters of a static conical bed and an operating conical spouted bed.Figure 3. Time evolution of the z coordinate of the tracer position during a typical experiment. Detection of the transition times when the tracer enters each region (H 0 5 20 cm and U/U ms 5 1.18).

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Section: Resultsmentioning

confidence: 99%

Experimental investigation of solid particles flow in a conical spouted bed using radioactive particle tracking

et al. 2015

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“…In the abovementioned systems the rate of the process is usually related to the heat-and mass-transfer rate between phases, which depends mainly on the hydrodynamics of bed-flow and the porosity of the bed. The hydrodynamic characteristics of ICFB systems have been investigated by a number of researchers, including Olazar et al (2001) andSan Jose et al (2005), who analyzed spouted bed hydrodynamics.…”

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confidence: 99%

Periodic Fluctuations of Flow and Porosity in Spouted Beds

Szafran

Kmieć

2006

Transp Porous Med

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The results of experimental investigations of bed flow hydrodynamics in spouted beds are compared with CFD simulations (Eulerian-Eulerian approach) for two different column geometries. The experimental results of bed porosity and fluctuation frequency of mass flow rate of grain in the fountain region are compared with the corresponding results of simulations. The simulation results confirmed the observations of Muir et al. (1990, Chem. Eng. Comm. 88: 153-171) and Yang and Keairns (1978, AlchE Symp. Ser. No. 176 74: 218) that fluctuations of bed flow in DTSB are caused by particle cluster formation in the loading region at the bottom of column.The solids cross into the jet and cover the column inlet and are carried upward periodically through a draft tube. Subsequent figures obtained from simulations, which show stages of particle cluster formation at the entrance of column, exactly match visual observations. The frequency of fluctuations of grain mass flow rate predicted in simulations (∼5-6 Hz) is in the range of that experimentally determined. The fluctuating inflow of solids results in slug formation and explains the vertical variations of height and porosity of the fountain. NotationGravity acceleration (m/s 2 ) h bed Initial height of bed (m) = I Identity tensor

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“…3,4,17,18,[38][39][40][41][42][43][44] The probe used for spout geometry measurement has been detailed in these previous papers. In Figure 2, a diagram of the equipment used and the arrangement of the optical fiber probe in the contactor are shown.…”

Section: Methodsmentioning

confidence: 99%

Spout Geometry in Shallow Spouted Beds with Solids of Different Density and Different Sphericity

José

Álvarez

Salazar

et al. 2005

Ind. Eng. Chem. Res.

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Spout diameter has been measured in shallow spouted beds by means of an optical fiber probe, for different geometric factors of the contactor (base angle and gas inlet diameter) and under different experimental conditions (stagnant bed height, gas velocity, particle density, particle size, and particle shape). The study has been performed with glass beads and low-density solids (high and low-density polyethylene, polypropylene, and extruded and expanded polystyrene). A correlation that is valid to predict the average spout diameter in cylindrical spouted beds for beds composed of solids of different density, size, and shape has been developed that is in agreement with the experimental data. This equation is interesting for the proposal of real models for gas-solid flow.

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Local porosity in conical spouted beds consisting of solids of varying density

Cited by 33 publications

References 29 publications

Experimental investigation of solid particles flow in a conical spouted bed using radioactive particle tracking

Experimental investigation of solid particles flow in a conical spouted bed using radioactive particle tracking

Periodic Fluctuations of Flow and Porosity in Spouted Beds

Spout Geometry in Shallow Spouted Beds with Solids of Different Density and Different Sphericity

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