Table of Contents
Journal of Powder Technology
Volume 2014, Article ID 163469, 8 pages
http://dx.doi.org/10.1155/2014/163469
Research Article

Wall-to-Bed Heat Transfer at Minimum Gas-Solid Fluidization

1Department of Chemical Engineering, KU Leuven, Chemical and Biochemical Process Technology and Control Section, de Croylaan 46, 3001 Heverlee, Belgium
2School of Engineering, University of Warwick, Coventry, UK
3Department of Chemical Engineering, KU Leuven, Process and Environmental Technology Lab, J.P. De Nayerlaan 5, 2860 Sint-Katelijne-Waver, Belgium

Received 7 May 2014; Accepted 3 September 2014; Published 17 September 2014

Academic Editor: Clive E. Davies

Copyright © 2014 Huili Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The heat transfer from a fluidized bed to the cooling jacket of the vessel has been studied for various powders at minimum fluidization conditions, by both convection and conduction approaches. These heat transfer characteristics are important as the point of transition between packed and fluidized bed operations and are needed in designing heat transfer operations where bubble-flow is not permitted. The effective thermal conductivity of the emulsion moreover determines the contact resistance at the heating or cooling surface, as used in packet renewal models to predict the wall-to-bed heat transfer. In expressing the overall heat transfer phenomenon as a convective heat transfer coefficient, it was found that the results could be fitted by .