Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/3310
Título: Estimation of water diffusivity parameters on grape dynamic drying
Autor: Ramos, Inês N.
Miranda, João M.R.
Brandão, Teresa R.S.
Silva, Cristina L.M.
Palavras-chave: Dynamic convective drying
Water diffusivity
Numerical modelling
Data: 2010
Editora: Elsevier
Citação: RAMOS, Inês N...[et al.] - Estimation of water diffusivity parameters on grape dynamic drying. Journal of Food Engineering. ISSN 0260-8774. Vol. 97, n.º 4 (2010), p. 519–525
Resumo: A computer program was developed, aiming at estimating water diffusivity parameters in a dynamic drying process with grapes, assessing the predictability of corresponding non-isothermal drying curves. It numerically solves Fick’s second law for a sphere, by explicit finite differences, in a shrinking system, with anisotropic properties and changing boundary conditions. Experiments were performed in a pilot convective dryer, with simulated air conditions observed in a solar dryer, for modelling the process. The equivalent radius of grapes decreased 30% until the end of the process, stressing the need to include shrinkage in mass and heat transfer models. It was observed that macroscopic shrinkage reflects cellular shrinkage, if plotted versus the normalised water content. Diffusivity values ranged between 1 10 16 and 1 10 10 m2/s. The developed methodology yields very good prediction of dynamic drying curves.
URI: http://hdl.handle.net/10400.14/3310
Versão do Editor: http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235088%232010%23999029995%231578687%23FLA%23&_cdi=5088&_pubType=J&_auth=y&_acct=C000057417&_version=1&_urlVersion=0&_userid=2460358&md5=7e3d13187bb744a188af76da66a5b673
Aparece nas colecções:CBQF - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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