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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 10, 2011
Accepted October 2, 2011

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Heat transfer in a swirling fluidized bed with geldart type-D particles

Mohd Faizal Mohideen^{1 2†} Binod Sreenivasan³ Shaharin Anwar Sulaiman² Vijay Raj Raghavan²

¹Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Batu Pahat, Johor, Malaysia ²Department of Mechanical Engineering, Universiti Teknologi Petronas, 31750 Tronoh, Perak, Malaysia ³Department of Mechanical Engineering, Indian Institute of Technology Kanpur, 208016, India

Korean Journal of Chemical Engineering, July 2012, 29(7), 862-867(6), 10.1007/s11814-011-0255-6

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Abstract

A relatively new variant in fluidized bed technology, designated as the swirling fluidized bed (SFB), was investigated for its heat transfer characteristics when operating with Geldart type D particles. Unlike conventional fluidized beds, the SFB imparts secondary swirling motion to the bed to enhance lateral mixing. Despite its excellent hydrodynamics, its heat transfer characteristics have not been reported in the published literature. Hence, two different sizes of spherical PVC particles (2.61mm and 3.65mm) with the presence of a center body in the bed have been studied at different velocities of the fluidizing gas. The wall-to-bed heat transfer coefficients were measured by affixing a thin constantan foil heater on the bed wall. Thermocouples located at different heights on the foil show a decrease in the wall heat transfer coefficient with bed height. It was seen that only a discrete particle model which accounts for the_x000D_ conduction between the particle and the heat transfer surface and the gas-convective augmentation can adequately represent the mechanism of heat transfer in the swirling fluidized bed.

Keywords

Swirling Fluidized Bed (SFB) Geldart Type D Particles Heat Transfer Coefficient Superficial Velocity

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