Experimental Validation of Thin‐layer Drying Models

Sander, Aleksandra; Kardum, Jasna Prlić

doi:10.1002/ceat.200800543

Cited by 15 publications

(14 citation statements)

References 16 publications

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“…The empirical parameter n makes Page's equation a two parameter model. This parameter could change with initial moisture content or drying conditions to carry out to a better fitting (Jayas et al, ; Sander & Kardum, ).…”

Section: Resultsmentioning

confidence: 99%

Microwave, convective, and intermittent microwave-convective drying of pulsed vacuum osmodehydrated pumpkin slices

Junqueira

Corrêa

Ernesto

2017

J Food Process Preserv

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The drying of pumpkin slices (Cucurbita moschata Duch.) by microwave, convective, and intermittent microwave–convective techniques was studied. The samples were pretreated by blanching followed by pulsed vacuum osmotic dehydration. The microwave output power was 780 W. Air temperatures were 30 °C and 60 °C and air velocities were 2.22 and 4.44 m s−1. The final moisture content was set at 0.08 kg [H2O] kg−1 [dry matter]. The drying kinetics were obtained and fitted with the Fick's model and the Page's empirical correlation. Color, water activity, shrinkage, and rehydration were evaluated. Shorter drying times, higher diffusivity and better color quality were obtained by employing microwave. Convective experiments carried out to higher water activity and lower shrinkage. For describing the drying behavior, the better adjustment was reached by the Page's empirical correlation. Practical applications The pumpkin (Cucurbita moschata Duch.) is well known as an important source of carotenoids, vitamins and minerals. After the harvest, techniques are required to assist the preservation of fruits, once they present high moisture contents. Microwave drying is an alternative method to preserve temperature‐sensitive compounds and to economize energy and time. Microwave energy combined with other drying methods can improve the drying efficiency as well as the quality of food products which is far better than that achievable by the application of each method alone. This study investigates the efficacy of convective, microwave and intermittent microwave–convective drying techniques for osmodehydrated pumpkin slices. The mathematical models provide information about the processes. It was also evaluated the changes on physical characteristics of the product after drying.

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Section: Resultsmentioning

confidence: 99%

Microwave, convective, and intermittent microwave-convective drying of pulsed vacuum osmodehydrated pumpkin slices

Junqueira

Corrêa

Ernesto

2017

J Food Process Preserv

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“…Many mathematical models, e.g. [5][6][7], are available in literature for simulating various categories of adsorbent and drying systems, each considered in isolation. Although both processes are well-understood, very few models are available that show systematically the interactions between them and how system energy efficiency is affected.…”

Section: Introductionmentioning

confidence: 99%

Model‐Based Energy Efficiency Optimization of a Low‐Temperature Adsorption Dryer

Atuonwu

Straten

Deventer³

et al. 2011

Chem Eng & Technol

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Low-temperature drying is important for heat-sensitive products, but at these temperatures conventional convective dryers have low energy efficiencies. To overcome this challenge, an energy efficiency optimization procedure is applied to a zeolite adsorption dryer subject to product quality. The procedure finds a trade-off between the improved drying capacity due to dehumidification and energy expenditure due to regeneration while incorporating product drying properties. By optimizing the regeneration air inlet temperature, drying air, adsorbent, and regeneration air flow rates as well as sensible and latent heat recovery from the regenerator exhausts, the energy efficiency is improved by up to 45 % compared to the state-of-the-art. The high mass transfer effect of high temperatures is utilized in the regenerator to boost dehumidification while isolating the heatsensitive dried product from the quality-degrading effect.

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“…[i.e. [40][41][42][43][44][45][46][47][48][49][50][51] Application of thin layer drying models to textile drying has only appeared in the studies of Akyol et al [52,53] where the drying behaviour of viscose and wool yarns was investigated, respectively. Thus, to the best of the authors' knowledge, thin layer drying modelling of textile materials in fabric form has been carried out for the first time in this study.…”

Section: Modelling Of Drying Curves At Standard Atmospheric Conditionsmentioning

confidence: 99%

Analysis and modeling of drying behavior of knitted textile materials

2016

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Drying properties of textiles in summer and/or after any kind of physical activity resulted in sweating is of great importance for garments with high clothing comfort. This study analyses the drying behaviour of knitted fabrics produced from various fibres at different ambient air conditions. Drying kinetics and modelling of fabrics dried in standard environmental conditions were investigated in the first part. Polyester and lyocell fabrics were found to be the fasted dried samples. A two-stage modelling that is a combination of linear approach and thin-layer equations were used, and the best fitted equation was found to be the logarithmic one. The two-stage model was also proved to predict the drying rate. The second part included the effects of ambient humidity on drying times and rates. Drying time of polyester and polyester blended fabrics was affected by the increase in the humidity to a great extent. Furthermore a quadratic function was found to be highly correlated with the computed data so it was proposed to define the drying behaviour by ambient air humidity and drying time.

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Experimental Validation of Thin‐layer Drying Models

Cited by 15 publications

References 16 publications

Microwave, convective, and intermittent microwave-convective drying of pulsed vacuum osmodehydrated pumpkin slices

Microwave, convective, and intermittent microwave-convective drying of pulsed vacuum osmodehydrated pumpkin slices

Model‐Based Energy Efficiency Optimization of a Low‐Temperature Adsorption Dryer

Analysis and modeling of drying behavior of knitted textile materials

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