Diffusion model for thin layer drying process of corn

Open sun drying experiments in thin layers of crain-crain (CC), fever (FV) and bitter (BT) leaves grown in Abeokuta, Nigeria were conducted. The drying process took place in the falling rate period and no constant rate period was observed from the drying curves. Eight thin layer mathematical drying models were compared using the multiple determination coefficients (R2), reduced chi-square (χ2) and root mean square error (RMSE) between the observed and predicted moisture ratios. Accordingly, Midilli et al. model satisfactorily described the drying curves of the three leaves with R2 of 0.9980, χ2 of 2.0×10-4 and RMSE of 1.09×10-2 for CC leaves; R2 of 0.9999, χ2 of 2×10-6 and RMSE of 1.11×10-3 for FV leaves; and R2 of 0.9998, χ2 of 1.9×10-5 and RMSE of 3.3×10-3 for BT leaves. The effective diffusivity was found to be 52.91×10-10, 48.72×10-10 and 43.42×10-10 m2/s for CC, BT and FV leaves, respectively.

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Drying Process Modelling for Heavy Clay Products Using a New Thin Layer Drying Model

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.371.323 ◽

2013 ◽

Vol 371 ◽

pp. 323-327

Author(s):

Miloš Vasić ◽

Zagorka Radojević

Keyword(s):

Thin Layer ◽

Mathematical Models ◽

Process Modelling ◽

Experimental Investigations ◽

Drying Process ◽

Thin Layer Drying ◽

Heavy Clay ◽

Drying Models ◽

Drying Model ◽

Thin Layer Drying Models

Drying results, determined on samples made of masonry clay from the locality "Banatski Karlovac", are presented in this study. Experimental investigations were carried out in a laboratory recirculation dryer in which drying parameters (humidity, temperature, and velocity) could be programmed, controlled and monitored during drying process. Several mathematical models were used for drying process modelling. New semi-theoretical thin layer drying model, for heavy clay products, was developed and presented in this study. It represents a modification of Page's and logarithm's thin layer drying models. Results presented in this study have shown that new thin layer drying model describes and correlates the best experimentally determined drying process.

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Modelling of thin layer drying kinetics of some fruits under open-air sun drying process

Journal of Food Engineering ◽

10.1016/j.jfoodeng.2004.02.001 ◽

2004 ◽

Vol 65 (3) ◽

pp. 413-425 ◽

Cited By ~ 170

Author(s):

İnci Türk Toğrul ◽

Dursun Pehlivan

Keyword(s):

Thin Layer ◽

Drying Kinetics ◽

Drying Process ◽

Sun Drying ◽

Thin Layer Drying ◽

Kinetics Of

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Modelling and characteristics of thin layer convective air-drying of thyme (Thymus vulgaris) leaves

Czech Journal of Food Sciences ◽

10.17221/243/2017-cjfs ◽

2019 ◽

Vol 37 (No. 2) ◽

pp. 128-134

Author(s):

Osman Yağız Turan ◽

Ebru Fıratlıgil

Keyword(s):

Thin Layer ◽

Goodness Of Fit ◽

Food Preservation ◽

Moisture Ratio ◽

Coefficient Of Determination ◽

Thymus Vulgaris ◽

Drying Process ◽

Thin Layer Drying ◽

Drying Models ◽

Kinetics Of

Fruit and vegetable dehydration has been extensively studied for the improvement of food preservation. Effects of drying temperature on the drying kinetics of thyme were investigated and a suitable drying model was obtained to describe the drying process. Drying behaviour of thyme leaves at temperatures of 50, 60, 70 and 80°C was determined by using a conventional drying oven, and moisture ratio and drying rates were calculated. Four different thin layer drying models, namely Lewis, Henderson and Pabis, Page, and logarithmic models, were used to fit the experimental moisture ratio data. Three statistical parameters: coefficient of determination (R<sup>2</sup>), chi-square (χ<sup>2</sup>) and root mean square error (RMSE) were used to compare the goodness of fit of the drying models. Logarithmic model and Page model give the best description of the drying process kinetics of thyme leaves by comparing the experimental values and predicted values.

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Investigation of Microwave-Induced Thin-Layer Drying for Municipal Sludge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.3227 ◽

2012 ◽

Vol 518-523 ◽

pp. 3227-3230 ◽

Cited By ~ 2

Author(s):

He Xun Huang ◽

Han Ping Chen ◽

Zhi Feng Hu ◽

Xiao Qian Ma

Keyword(s):

Diffusion Coefficient ◽

Reaction Time ◽

Thin Layer ◽

Microwave Radiation ◽

The Other ◽

Drying Rate ◽

Research Model ◽

Municipal Sludge ◽

Drying Process ◽

Thin Layer Drying

Since the adverse factors such as deficient penetration and long reaction time have restricted the complete microwave-used drying of municipal sludge, the microwave-induced drying was considered which has advantages in such aspects. The investigation of the microwave-induced drying to uncover the mechanism has great meaning for its development and usage. The experiments indicated that temperature was the decisive factor affecting the drying rate. The microwave-induced sludge reached the highest drying rate at the moisture rate of 40%, with a 20% grade promotion compared with that of the original one. The molecular fracture caused by microwave radiation had obviously accelerated the drying process and the drying rate was rising in proportion to the microwave radiation dose. The diffusion coefficient of microwave-induced sludge was obviously enlarged more than 2 times grade. In this research, model Weibull proved to fit the experiment of thin-layer drying for municipal sludge best compared with the other ones.

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