Evaluation of Moisture Diffusion Coefficient of Cylindrical Bodies Considering Shrinkage During Natural Convection Drying
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Najmur Rahman
An analytical diffusion model which considers the influence of the external resistance to mass transfer, sample finite geometry and shrinkage is proposed to simulate drying kinetic curves of cylindrical bodies. The convective mass transfer coefficients, hm at air-solid interface obtained from natural convection drying experiments on potato cylinders of length 0.05m and diameter 0.01m at different air drying temperatures were used for the model evaluation. Using Levenberg-Marquardt algorithm for optimization, an empirical relation describing effective diffusion coefficient of potato as a function of air temperature and material moisture content is proposed for finite and infinite cylinders with and without considering shrinkage. The significance of material moisture content in the proposed diffusion coefficient relation is demonstrated through a comparison between the predicted and experimental moisture content ratios. The mean effective diffusion coefficient, Deff for finite shrinking cylindrical bodies is found to vary from 3.93 to 8.63 x 10-10 m2/s for the temperature range of 40 to 60°C. In addition, the assumption of infinite geometry instead of finite one in the model evaluation results in an overestimation of Deff. However, lower values of Deff are obtained when shrinkage effect is taken into account in the analysis, irrespective of the product size considered.
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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- Improving Anti-?-Glucosidase Activity of Douchi Koji Using a Newly Isolated Strain of Bacillus subtilis B2
- Different Approaches for Mass Transfer Studies on Potato Cylinders and Slices during Solar Drying
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- Evaluation of Moisture Diffusion Coefficient of Cylindrical Bodies Considering Shrinkage During Natural Convection Drying
- Effect of Raw Material and Processing Factors on the Production of Effervescent Artichoke (Cynara scolymus L.) Tea Tablets
- Optimization of Culture Conditions on Mycelial Grown in Submerged Culture of Cordyceps militaris
- Suitability of Feature Extraction Methods in Recognition and Classification of Grains, Fruits and Flowers
- Hydrodistillation of Essential Oil from Cymbopogon flexuosus
- A Survey on Packaging Materials and Technologies for Commercial Food Products
- Formulation, Drying and Nutritional Evaluation of Ready-to-Eat Sapota (Achras zapota) Extrudes
- High Hydrostatic Pressure Effect on Natural Microflora, Saccharomyces cerevisiae, Escherichia coli, and Listeria Innocua in Navel Orange Juice
- Effective Parameters Consideration in Ohmic Heating Process in Two Phase Static System of Bio-Particle-Liquid
- Proximate Composition of Dry Fermented Turkish Sausage (Sucuk) as Affected by Ripening Period, Nitrite Level and Heat Treatment
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