Osmotic dehydration and convective drying of coconut slices: Experimental determination and description using one-dimensional diffusion model

Silva, Wilton Pereira da; Silva, Cleide Maria Diniz Pereira da Silva e; Aires, Juarez Everton de Farias; Silva, Aluízio Freire da

doi:10.1016/j.jssas.2013.05.002

Cited by 17 publications

(13 citation statements)

References 27 publications

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“…Thus, it is known that shelf life increases with water removal. As reported by DA SILVA et al (2014) and many other authors, the use of hot air to remove water from plant tissues consists of an expensive process owning to liquid-vapor phase change phenomenon, once latent heat of vaporization is high. As a result, pretreatments are generally applied before convective drying.…”

Section: Introductionmentioning

confidence: 98%

Comparison of diffusion models for description of osmotic dehydration of radish slices dipped in brine

Silva

Gomes

2015

Eng. Agríc.

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This paper aims at describing the osmotic dehydration of radish cut into cylindrical pieces, using one-and two-dimensional analytical solutions of diffusion equation with boundary conditions of the first and third kind. These solutions were coupled with an optimizer to determine the process parameters, using experimental data. Three models were proposed to describe the osmotic dehydration of radish slices in brine at low temperature. The two-dimensional model with boundary condition of the third kind well described the kinetics of mass transfers, and it enabled prediction of moisture and solid distributions at any given time.KEYWORDS: inverse method; analytical models; cylindrical geometry COMPARAÇÃO DE MODELOS DE DIFUSÃO NA DESCRIÇÃO DA DESIDRATAÇÃOOSMÓTICA DE FATIAS DE RABANETE EM SALMOURA RESUMO: Este artigo descreve a desidratação osmótica de rabanete cortado em pedaços cilíndricos, usando soluções analíticas uni e bidimensionais da equação de difusão com condições de contorno do primeiro e terceiro tipos. Para determinar os parâmetros de processo, tais soluções foram acopladas a um otimizador que usa dados experimentais e o método inverso. Três modelos foram analisados na descrição de um experimento de desidratação osmótica de fatias de rabanete mergulhadas em salmoura, em baixa temperatura. Um modelo bidimensional com condição de contorno do terceiro tipo descreveu bem os processos de migração de massa e possibilitou prever as distribuições de umidade e de sólidos em um instante qualquer. PALAVRAS-CHAVE:Método inverso, modelos analíticos, geometria cilíndrica.

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Section: Introductionmentioning

confidence: 98%

Comparison of diffusion models for description of osmotic dehydration of radish slices dipped in brine

Silva

Gomes

2015

Eng. Agríc.

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“…Souraki et al (2012) studied the process of osmotic dehydration of green beans in solutions of NaCl, and used the standard model suggested by Azuara et al (1992) in order to describe the kinetics of the A common approach to problems of dehydration is the use of analytical solutions in diffusion models in order to describe the two mass transfers found in the process (Falade et al, 2007, Ruiz-Lopez et al, 2010Uribe et al, 2011). Silva et al (2013b) employed an analytical solution from the diffusion equation with infinite slab geometry to describe mass migration in coconut slices during the process of convective drying and osmotic dehydration. However, analytical solutions have some limitations.…”

Section: Introductionmentioning

confidence: 99%

Effects of Salt Concentration on Osmotic Dehydration of Green Bean

Silva

Júnior

Aires

et al. 2015

JAS

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In this study, mass transfer simulations were performed during the process of osmotic dehydration of green beans in NaCl solutions of 20 and 26.5% at 50 °C. Additionally, the effect of solute concentration on boundary conditions was investigated. For such, a diffusion modelassuming constant diffusivity -and the geometry of an infinite cylinder was considered. A numerical solution was also developed and coupled with an optimizer in order to obtain the process parameters using experimental data. The results were consistent with those mentioned in the literature, for which analytical tools were utilized to describe the process.

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“…Moreover, models involving convective boundary condition is better to describe the drying process of tiles, since there is always resistance to mass flow on the surface of the product [19]. Various studies adopt the convective boundary condition for the description of drying processes [3,20,14].…”

Section: Introductionmentioning

confidence: 99%

“…According to the experiments, specific conditions and product geometry, one-dimensional models, two-dimensional models, and three-dimensional models were used to describe the drying process [3,10,12,14,15,17].…”

Section: Introductionmentioning

confidence: 99%

“…Such methods are useful to describe much of the process; however, they do present some limitations [25]. As a result, some researchers adopt analytical or numerical solutions coupled with optimizers for estimating the process parameters based on experimental data by using the inverse method [9,14,16]. In this context, the computer processing time required by the optimizer to estimate the parameters will depend on the type of solution, on the geometry and on the boundary condition in the adopted diffusion model, which, in some cases, may be considerably long.…”

Section: Introductionmentioning

confidence: 99%

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Drying of clay slabs: prediction by means of one-dimensional diffusion models

Aires

Júnior

Aires

et al. 2015

Mat.-wiss. u. Werkstofftech

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The main purpose of this article is to describe convective drying of clay slabs with initial moisture content of 0.11 (db) at temperatures of 50 and 90°C. To describe the water diffusion process, was considered: a) constant effective mass diffusivity (Model 1); b) variable effective mass diffusivity (Model 2). A numerical solution of the onedimensional diffusion equation with boundary condition of the third kind was proposed in order to describe the drying process. The solution was coupled with an optimizer in order to estimate the process parameters for each drying air temperature using experimental datasets and the inverse method. Comparative studies were performed between Models 1 and 2 in order to define the accuracy of description of the drying process. Comparative studies are also conducted on the proposed models and on diffusive models with two-and three-dimensional geometries. An analysis of statistical indicators shows that Model 2 is comparable to models with twoand three-dimensional geometries, being in perfect agreement with the experimental results. However, the computational processing time for the proposed model is much shorter than that obtained with the use of two-and three-dimensional geometries. However, it was observed that the one-dimensional model overestimates the process parameters.

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Osmotic dehydration and convective drying of coconut slices: Experimental determination and description using one-dimensional diffusion model

Cited by 17 publications

References 27 publications

Comparison of diffusion models for description of osmotic dehydration of radish slices dipped in brine

Comparison of diffusion models for description of osmotic dehydration of radish slices dipped in brine

Effects of Salt Concentration on Osmotic Dehydration of Green Bean

Drying of clay slabs: prediction by means of one-dimensional diffusion models

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