Kinetics and mathematical models of date paste dried using a convective infrared dryer

Mahmoud Younis, Khaled Abdel Wahed Ahmed, Isam Ali Mohamed Ahmed, Hany Mohamed Yehia, Diaeldin Omer Abdelkarim and Ahmed Elfeky
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Mahmoud Younis: Chair of Dates Industry and Technology, Department of Agricultural Engineering, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia
Khaled Abdel Wahed Ahmed: Chair of Dates Industry and Technology, Department of Agricultural Engineering, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia
Isam Ali Mohamed Ahmed: Food Science and Nutrition Department, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia
Hany Mohamed Yehia: Food Science and Nutrition Department, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia
Diaeldin Omer Abdelkarim: Chair of Dates Industry and Technology, Department of Agricultural Engineering, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia
Ahmed Elfeky: Department of Agricultural Engineering, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia

Czech Journal of Food Sciences, 2024, vol. 42, issue 6, 465-475

Abstract: Achieving the desired level of caramelisation in a date powder requires considerable effort. Consequently, an assessment was conducted on efficacy of thin-layer infrared dehydration for date paste. Various parameters were considered, including airflow velocities of 0.5, 1.0, and 1.5 m.s-1, radiation intensities of 0.076, 0.1528, and 0.228 W.cm-2, and date paste layer thicknesses of 3 mm and 5 mm. The study's findings indicated a positive correlation between drying rate and lowering airflow velocity and a negative correlation between drying time and decreasing airflow velocity, the thickness of date paste, and rising intensity of infrared. The effective moisture diffusivity (Deff) was caculated by employing Fick's diffusion equation. For all situations under investigation, the mean values were within the range of 3.94 × 10-11 m2.s-1 to 6.01 × 10-10 m2.s-1. A relationship has been established between Deff and moisture content. Seven distinct mathematical models were subjected to rigorous validation by applying non-linear regression analysis, aiming to accurately characterise the drying process of date paste. The modified two-term model provided the most accurate forecast of the drying process for date paste layers.

Keywords: drying rate; convection-infrared dryer; mathematical modeling; effective moisture diffusivity (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:42:y:2024:i:6:id:66-2024-cjfs

DOI: 10.17221/66/2024-CJFS

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