Entropy production during the drying process of milk droplets in an industrial spray dryer

Publikationstyp
Journal Article
Publikationsdatum
2011
Sprache
English
Author
Jin, Yan 
Technische Thermodynamik M-21 
Chen, Xiao Dong
TORE-URI
https://hdl.handle.net/11420/43957
Enthalten in
International journal of thermal sciences 
Volume
50
Issue
4
Start Page
615
End Page
625
Citation
International Journal of Thermal Sciences 50 (4): 615-625 (2011)
Publisher DOI
10.1016/j.ijthermalsci.2010.10.013
Scopus ID
2-s2.0-79151483157
Publisher
Elsevier
Development of high energy efficiency spray dryers is of great importance for the future of the dairy powder industry. The present research studied energy efficiency in an industrial scale spray dryer with the second law of thermodynamics. The entropy production rate is computed from the CFD modeling results of the transient multi-phase flow in the spray dryer. Influences of particle size, inlet air flowrate and inlet air temperature on the entropy production rate are analyzed. The results show that large particles produce more entropy per unit mass on dry basis. To decrease the moisture content of product powders, it will produce more entropy by increasing inlet mass flowrate than by increasing the air temperature. The study shows that the second law of thermodynamics is a potential tool for optimizing dryer operation and design.
Schlagworte
CFD
Entropy production
FLUENT
Milk droplets
Second law of thermodynamics
Spray dryer
DDC Class
530: Physics
620: Engineering