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4th Thermal and Fluids Engineering Conference

ISSN: 2379-1748

CFD-DEM APPROACH TO CALCULATE THE FLOWAND HEAT TRANSFER BEHAVIORS IN FLUIDIZED BED WITH IMMERSED TUBE AT PARTICLE SCALE

Raj Nannamkeril Naveen
Dept Of Applied Mechanics, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India 600036

S. Vengadesan
Fluid Mechanics Laboratory, Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India 600036

Danesh K. Tafti
Mechanical Engineering Department, Virginia Tech, 213E Goodwin Hall, Blacksburg, VA 24061, USA

DOI: 10.1615/TFEC2019.nmf.027975
pages 1519-1524


KEY WORDS: fluidized bed, discrete element method (DEM), computational fluid dynamics (CFD), immersed tube soft-sphere approach, heat transfer

Abstract

A method to resolve particle-particle and particle-wall unsteady conduction heat transfer is developed within the framework of the soft sphere collision model. The unsteady heat transfer model is incorporated in an existing CFD-DEM framework. The model is derived from the analytical solution of one-dimensional unsteady heat conduction between two semi-infinite objects. The model considers the area and time of contact with appropriate scaling for compatibility with the soft sphere model. The model is validated against experimental data available from the literature for three cases. The cases considered are pairwise particle-particle collision, single particle-surface collision, and that of the decay of temperature of a heated particle in a fluidized bed, including convection and particle-particle-wall conduction heat transfer. The results obtained are in good agreement with the experimental data. Next, the model is applied to a fluidized bed with an immersed tube to characterize the heat transfer mechanisms and the effective heat transfer coefficient. The influences of fluidization parameters such as gas velocity and particle diameter on heat transfer mechanism is investigated.

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