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

Mohideen Batcha, Mohd Faizal and Sreenivasan, Binod and Anwar Sulaiman, Shaharin and Raghavan, Vijay Raj (2012) Heat transfer in a swirling fluidized bed with Geldart type-D particles. Korean Journal Chemical Engineering, 29 (7). pp. 862-867. ISSN 0256-1115

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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 constant 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 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.

Item Type: Article
Uncontrolled Keywords: swirling fluidized bed (SFB); Geldart type D particles; heat transfer coefficient; superficial velocity
Subjects: Q Science > QC Physics
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 11 Mar 2014 04:43
Last Modified: 22 Jan 2015 00:31
URI: http://eprints.uthm.edu.my/id/eprint/3892
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