Mass transfer coefficient for drying of moist particulate in a bubbling fluidized bed


Experiments on drying of moist particles by ambient air were carried out to measure the mass transfer coefficient in a bubbling fluidized bed. Fine glass beads of mean diameter 125?µm were used as the bed material. Throughout the drying process, the dynamic material distribution was recorded by electrical capacitance tomography (ECT) and the exit air condition was recorded by a temperature/humidity probe. The ECT data were used to obtain qualitative and quantitative information on the bubble characteristics. The exit air moisture content was used to determine the water content in the bed. The measured overall mass transfer coefficient was in the range of 0.0145–0.021?m/s. A simple model based on the available correlations for bubble-cloud and cloud-dense interchange (two-region model) was used to predict the overall mass transfer coefficient. Comparison between the measured and predicted mass transfer coefficient have shown reasonable agreement. The results were also used to determine the relative importance of the two transfer regions.

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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: This is the pre-peer reviewed version of the following article: Makkawi, Yassir and Ocone, Raffaella (2009). Mass transfer coefficient for drying of moist particulate in a bubbling fluidized bed. Chemical Engineering and Technology, 32 (1), pp. 64-72., which has been published in final form at
Uncontrolled Keywords: bubbles,drying,electrical capacitance tomography,fluidized beds,mass transfer,Chemical Engineering(all),Chemistry(all),Industrial and Manufacturing Engineering
Publication ISSN: 1521-4125
Last Modified: 17 May 2024 07:07
Date Deposited: 26 Jan 2011 11:49
Full Text Link: http://onlineli ... 800483/abstract
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2009-01
Authors: Makkawi, Yassir (ORCID Profile 0000-0003-4971-5878)
Ocone, Raffaella


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