Macroscopic properties of liquid–solid circulating fluidized bed with viscous liquid medium

Shilapuram, Vidyasagar; Krishnaiah, K.; Sai, P. S. T.

doi:10.1016/j.cep.2010.11.004

Cited by 23 publications

(35 citation statements)

References 29 publications

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“…Therefore, circulating fluidization starts earlier for the glass bead-glycerol system, as depicted in Figure 12. The effect of liquid viscosity studied by Vidyasagar et al (2011) for a glass beads-glycerol system shows a similar result. For the sand system of varying viscosity, as shown in Figure 13, the solid circulation velocity increases for viscous solutions of 1.08 and 1.36 cP.…”

Section: Effect Of Liquid Viscosity On Solid Circulation Ratesupporting

confidence: 65%

“…It was further observed that the circulating fluidized bed regime started before the superficial total liquid velocity reached the terminal velocity of the particles for glass beads due to the early equivalence of the interstitial liquid velocity to the terminal velocity of the particles. Vidyasagar et al (2011) studied dense phase expansion, fluidized bed and CFB pressure drop profiles corresponding to a state of transition from conventional to CFB regime for various viscous solutions in glass bead systems. …”

Section: Resultsmentioning

confidence: 99%

“…The effect of liquid viscosity on the fixed inventory mode was studied by Vidyasagar et al (2011) for different solid inventories and macroscopic flow properties such as pressure gradient, critical transitional liquid velocity to circulating fluidized bed regime, average solid holdup, axial solid hold up distribution and solid circulation rate.…”

Section: Introductionmentioning

confidence: 99%

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Solid Holdup and Circulation Rate in a Liquid-Solid Circulating Fluidized Bed With Viscous Liquid Medium

Gnanasundaram

Loganathan

Perumal

2015

Braz. J. Chem. Eng.

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-Experiments were conducted in a liquid-solid circulating fluidized bed with different viscous liquids and particles to study the hydrodynamics, average solid hold up and solid circulation rate. The effects of operating parameters, i.e., primary liquid flow rate in the riser, auxiliary liquid flow rate, total liquid flow rate and viscosity of the liquid were studied for solids of different density and particle size. Results show that the circulating fluidization regime starts earlier for more viscous solutions because of the decrease in critical transitional velocity. The onset of solid holdup increases with an increase in liquid viscosity for sand and for glass beads. The solid circulation rate increases with an increase in total velocity and auxiliary velocity, and also increases with increasing viscosity.

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Section: Effect Of Liquid Viscosity On Solid Circulation Ratesupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Solid Holdup and Circulation Rate in a Liquid-Solid Circulating Fluidized Bed With Viscous Liquid Medium

Gnanasundaram

Loganathan

Perumal

2015

Braz. J. Chem. Eng.

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“…Vidyasagar et al, (2011) andChan et al, (2003) has reported solid holdup for viscous fluids apart from water. Vidyasagar et al, (2011) proposed a correlation that includes primary and auxiliary velocities, both in dimensional and dimensionless form, to calculate average solid holdup in terms of solid inventory and liquid viscosity. The solid holdup for viscous solutions in an LSCFB is controlled by the operating variables, i.e.…”

Section: Empirical Equationmentioning

confidence: 99%

“…When the value of this parameter drops below 1, non-uniformity, with solids favoring the wall is seen. Vidyasagar et al, (2011) on the analysis of the results of his experimentation, obtained a regression model for solid holdup. It was noted that the model obtained was not dimensionless as is required to satisfy the dimensionless nature of the solid holdup.…”

Section: Nomenclaturementioning

confidence: 99%

Effect of Liquid Viscosity and Solid Inventory on Hydrodynamics in a Liquid - solid Circulating Fluidized Bed

Sundaram

Venugopal²,

Ullas

et al. 2017

JAFM

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A comprehensive hydrodynamic study of a Liquid -Solid Circulating Fluidized Bed (LSCFB) is conducted with changes in viscosity of the fluidizing medium and the inventory height of solids initially fed into the system. An LSCFB of height 2.95m and riser outer diameter 0.1m was chosen for experimentation. The three liquid media systems with varying viscosities that were chosen were water, glycerol 10% (v/v) and glycerol 20% (v/v). Effect of inventory on the hydrodynamics was also studied, by taking initial heights of inventory to be 15cm, 25cm and 35cm. The hydrodynamic studies concentrated on pressure gradients along the axial pressure tapings, axial solid holdup, average solid holdup, solid circulation rate and slip velocity. Uniformity in axial solid holdup and average solid holdup was validated for changes in viscosity and inventory. Solid flux was seen to follow an inverse relationship to holdup. The changes in slip velocity with varying viscosity and inventory were studied, and found to decrease with both variables. The distribution parameter, Co of the drift flux model was found to be in the range of 0.983-0.994, suggesting non-uniformity in radial solid distribution, with higher solid concentration by the walls compared to the core of the column.

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Liquid–Solid Processes

Wadnerkar

Gunjal

Mishra

2022

Multiphase Flows for Process Industries

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Macroscopic properties of liquid–solid circulating fluidized bed with viscous liquid medium

Cited by 23 publications

References 29 publications

Solid Holdup and Circulation Rate in a Liquid-Solid Circulating Fluidized Bed With Viscous Liquid Medium

Solid Holdup and Circulation Rate in a Liquid-Solid Circulating Fluidized Bed With Viscous Liquid Medium

Effect of Liquid Viscosity and Solid Inventory on Hydrodynamics in a Liquid - solid Circulating Fluidized Bed

Liquid–Solid Processes

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