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Application of computational fluid dynamic simulations to spray-freezing operations
conference contribution
posted on 2009-08-11, 13:26 authored by C. Anandharamakrishnan, Jolius Gimbun, Andy StapleyAndy Stapley, Chris RiellyChris RiellySpray-freezing is an important precursor to spray-freeze-drying operations. A
3-D CFD simulation for spray-freezing was developed and was used to identify design
improvements to avoid problems such as high particle temperatures and low particle
collection efficiencies. This model included the latent heat of fusion by increasing the
effective specific heat capacity of the particles over the temperature range -10 to 0 ºC. The
model was also able to track particles to calculate particle residence time distributions and
outlet particle collection efficiencies. The simulation predictions agreed reasonably well
with experimentally measured gas temperatures (obtained by thermocouple
measurements) and droplet velocities (obtained by Phase Doppler Anemometry). Both
solid and hollow cone sprays were simulated, and the results suggested that a hollow cone
spray was more effective in cooling the particles uniformly, but yielded low particle
collection efficiency (13%). This could be partially overcome by increasing the diameter
of the product outlet to give particle collection efficiencies of 57%. The solid cone spray
appeared to show slightly better collection efficiencies for a narrow outlet spray-freezing
rig, although the freezing was less uniform.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Citation
ANANDHARAMAKRISHNAN, C. ... et al, 2008. Application of computational fluid dynamic simulations to spray-freezing operations. IN: 16th International Drying Symposium IDS 2008, 9-12th November 2008, Hyderabad, India. Vol A pp. 537-545Publisher
© University of MumbaiVersion
- AM (Accepted Manuscript)
Publication date
2008Notes
This article is Closed Access. It was published in International Drying Symposium IDS 2008 : vol A [© University of Mumbai].ISBN
819073718XLanguage
- en