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Title: | A study of particle histories during spray drying using computational fluid dynamic simulations |
Authors: | Anandharamakrishnan, C. Gimbun, Jolius Stapley, A.G.F. Rielly, Chris D. |
Keywords: | Impact positions Particle velocity and temperature Residence time Spray drying |
Issue Date: | 2010 |
Publisher: | © Taylor and Francis |
Citation: | ANANDHARAMAKRISHNAN, C. ... et al, 2010. A study of particle histories during spray drying using computational fluid dynamic simulations. Drying Technology, 28 (5), pp. 566-576. |
Abstract: | Computational fluid dynamics (CFD) models for short-form and
tall-form spray dryers have been developed, assuming constant rate
drying and including particle tracking using the source-in-cell
method. The predictions from these models have been validated
against published experimental data and other simulations. This
study differs from previous work in that particle time histories for
velocity, temperature, and residence time and their impact positions
on walls during spray drying have been extracted from the simulations.
Due to wet-bulb protection effects, particle temperatures
are often substantially different from gas temperatures, which is
important, because the particle temperature–time history has the
most direct impact on product quality. The CFD simulation of an
existing tall-form spray dryer indicated that more than 60% of
the particles impacted on the cylindrical wall and this may adversely
affect product quality, because solids may adhere to the wall for
appreciable times, dry out, and lose their wet-bulb protection. The
model also predicts differences between the particle primary
residence time distributions (RTD) and the gas phase RTD. This
study indicates that a short-form dryer with a bottom outlet is more
suitable for drying of heat-sensitive products, such as proteins, due
to the low amounts of recirculated gas and hence shorter residence
time of the particles. |
Description: | This is an electronic version of an article that was accepted for publication in the journal, Drying Technology [© Taylor & Francis] and the definitive version is available at:
http://dx.doi.org/10.1080/07373931003787918 |
Version: | Accepted for publication |
DOI: | 10.1080/07373931003787918 |
URI: | https://dspace.lboro.ac.uk/2134/7046 |
Publisher Link: | http://dx.doi.org/10.1080/07373931003787918 |
ISSN: | 1532-2300 0737-3937 |
Appears in Collections: | Published Articles (Chemical Engineering)
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