A computer simulation of hydrodynamics and heat transfer at immersed surfaces in a fluidized bed

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20006757

Kodikal, N J; Bhavnani, S H

A computer simulation of the hydrodynamics and heat transfer processes in a fluidized bed with bubbles propagating from a single jet has been developed. The velocity, volume fraction, and temperature distributions of both phases predicted by the model show satisfactory agreement with the experimental models of Kuipers (1990). An Eulerian-Eulerian approach that incorporates a two-fluid model was utilized. The simulation was developed using a general purpose Computational Fluid Dynamics (CFD) solver; PHOENICS{reg{underscore}sign}. The conservation equations describing the physics of the two-phase nature of the fluidized bed are solved using the finite volume approach. The Interphase-Slip-Algorithm, which is a part of the PHOENICS package, was utilized to ensure numerical stability and convergence of the problem. The unsteady state simulation predicts the hydrodynamics and heat transfer in the fluidized bed. Also predicted, is the formation and propagation of a bubble from a single jet near the immersed surface, as a function of time. The heat transfer coefficients prevailing at the immersed heated wall are calculated. The calculated values of the heat transfer coefficients and simulated hydrodynamics compare well with experimental and numerical data present in literature. Such a simulation technique allows performance evaluation for different bed input parameters, and can evolve into a tool that would help in the optimum design of a fluidized combustion chamber.

• Research Organization: Auburn Univ., AL (US)
• OSTI ID: 20006757
• Report Number(s): CONF-990534--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COMPUTER-AIDED DESIGN
COMPUTERIZED SIMULATION
FLUIDIZED-BED COMBUSTORS
HEAT TRANSFER
HYDRODYNAMICS
PERFORMANCE
TWO-PHASE FLOW