An Observer Based Methodology for Estimating Concentration-Dependent Diffusion Coefficients in Drying Considering Shrinkage
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Carlos Martínez-Vera
,
Alexander Schaum
Abstract
In this work, we present a method for estimating the diffusion coefficient in isothermal drying processes in those cases in which the associated shrinkage cannot be neglected. We assume that the drying process is described by the diffusion equation and depart of a numerical solution of reduced order to the corresponding problem. The method chosen for identifying the parameter in question is based in a high gain filter. As an example for showing the proposed method we take a solid presented by Aguerre et al. (Latin American Applied Research 2008;38:345–9). First, we solve the direct problem for generating an average moisture content profile and the corresponding radius profile. Taking the radius evolution as known data and the average moisture evolution as the innovation term in the filter, we solve the inverse problem and as a result a moisture-dependent diffusion coefficient is obtained, which is refined in a posterior and final optimization step.
References
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©2013 by Walter de Gruyter Berlin / Boston
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- Microencapsulation of Banana Juice from Three Different Cultivars
- Sensory Qualities, Antioxidant Activities, and in vitro Inhibition of Enzymes Relevant to Type-2 Diabetes by Biscuits Produced from 5 Wheat-Bambara Groundnut Flour Blends
- Effect of Different Particle Sizes and Levels of Wheat Bran on the Physical and Nutritional Quality of Sponge Cake
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- Some Biochemical and Physical Changes during Manufacturing of Grey Sufu, a Traditional Chinese Fermented Soybean Curd
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