Mass transfer in fluidized bed drying of moist particulate


Bubbling fluidized bed technology is one of the most effective mean for interaction between solid and gas flow, mainly due to its good mixing and high heat and mass transfer rate. It has been widely used at a commercial scale for drying of grains such as in pharmaceutical, fertilizers and food industries. When applied to drying of non-pours moist solid particles, the water is drawn-off driven by the difference in water concentration between the solid phase and the fluidizing gas. In most cases, the fluidizing gas or drying agent is air. Despite of the simplicity of its operation, the design of a bubbling fluidized bed dryer requires an understanding of the combined complexity in hydrodynamics and the mass transfer mechanism. On the other hand, reliable mass transfer coefficient equations are also required to satisfy the growing interest in mathematical modelling and simulation, for accurate prediction of the process kinetics. This chapter presents an overview of the various mechanisms contributing to particulate drying in a bubbling fluidized bed and the mass transfer coefficient corresponding to each mechanism. In addition, a case study on measuring the overall mass transfer coefficient is discussed. These measurements are then used for the validation of mass transfer coefficient correlations and for assessing the various assumptions used in developing these correlations.

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Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
Additional Information: ?C?r?e?a?t?i?v?e ?C?o?m?m?o?n?s?: ?A?t?t?r?i?b?u?t?i?o?n?-?N?o?n?C?o?m?m?e?r?c?i?a?l?-?S?h?a?r?e?A?l?i?k?e
ISBN: 978-953-307-215-9
Last Modified: 27 Jun 2024 12:10
Date Deposited: 04 Jan 2013 09:06
Full Text Link: http://www.inte ... ist-particulate
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PURE Output Type: Chapter
Published Date: 2011-02-11
Authors: Makkawi, Yassir (ORCID Profile 0000-0003-4971-5878)
Ocone, Raffaella


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