CFD Model of Apple Atmospheric Freeze Drying at Low Temperature
- 30 July 2007
- journal article
- research article
- Published by Informa UK Limited in Drying Technology
- Vol. 25 (7-8), 1331-1339
- https://doi.org/10.1080/07373930701438907
Abstract
An Internet-controlled atmospheric freeze dryer was designed, built, and tested in the Department of Heat and Mass Transfer, Technical University of Łódź. A film sublimation-based CFD model was developed and verified using Fluent 6.1 commercial CFD software. The model enables the simulation of phase change and water vapor diffusion process within porous media. Transport of non-condensable species can be calculated with species transport inbuilt model of Fluent 6.1 and used to predict sublimation rate under given conditions. Results were compared with AFD experimental data of 10-mm Idared apple cubes. The viability of applying the film sublimation model to atmospheric freeze-drying process was demonstrated. Higher mass flux was found on the leading edge, relatively uniform mass flux within the porous zone illustrates that vapor diffusion dominates atmospheric freeze drying process at low temperature (below 0°C). CFD results for apple cubes show a predomination of diffusional resistance of porous tissue.Keywords
This publication has 6 references indexed in Scilit:
- TRANSPORT PROPERTIES OF CELLULAR FOOD MATERIALS UNDERGOING FREEZE-DRYINGDrying Technology, 2001
- A Volume of Fluid Based Method for Fluid Flows with Phase ChangeJournal of Computational Physics, 2000
- Effective diffusivities in catalyst pellets: new model porous structures and transport simulation techniquesJournal of Catalysis, 1991
- ATMOSPHERIC FREEZE-DRYING PART 1 : DESIGN, EXPERIMENTAL INVESTIGATION AND ENERGY-SAVING ADVANTAGESDrying Technology, 1990
- AN ANALYSIS OF ATMOSPHERIC FREEZE DRYINGJournal of Food Science, 1974
- Forced convection condensation in the presence of noncondensables and interfacial resistanceInternational Journal of Heat and Mass Transfer, 1967