Abstract
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.
Highlights
Conventional liquid-solid fluidization has been studied intensively and almost all liquid-solid systems show particulate fluidization, resulting in uniform axial and radial solid holdup at liquid velocities below the particle terminal velocity (Richardson, 1954; Kunii and Levenspiel, 1991; Di Felice, 1995)
The present study demonstrated that, for the given auxiliary velocity, the solid holdup decreased with respect to the corresponding increase in primary and total velocity
The average solid holdup decreased with an increase in primary and total velocity and was found to increase with an increase in auxiliary velocity
Summary
Abstract - 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 increases with increasing viscosity.
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