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Agronomy
Volume 14
Issue 8
10.3390/agronomy14081728
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Article

The Analytical Theory of Water Activity in the Paddy Rice Drying Process

by
Han Wang
1,2,
Shengtao Li
1,
Ye Zhang
1,
Khaled Abdeen Mousa Ali
1,3,
Weihui Wu
2 and
Changyou Li
1,*
1
College of Engineering, South China Agricultural University, Guangzhou 510642, China
2
School of Intelligent Engineering, Shaoguan University, Shaoguan 512099, China
3
College of Agricultural Engineering, Al-Azhar University, Cairo 11751, Egypt
*
Author to whom correspondence should be addressed.
Agronomy 2024, 14(8), 1728; https://doi.org/10.3390/agronomy14081728
Submission received: 15 May 2024 / Revised: 12 July 2024 / Accepted: 5 August 2024 / Published: 6 August 2024
(This article belongs to the Section Agricultural Biosystem and Biological Engineering)
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Abstract

Drying involves the evaporation of moisture, accompanied by simultaneous heat transfer, mass transfer, and momentum transfer. While the diffusion law is considered an applicable model for explaining the drying phenomenon, the actual drying process cannot be accurately predicted using an analytical solution with a constant diffusion coefficient. Energy efficiency in the drying process is low due to an insufficient understanding of the mechanisms governing moisture migration from solids to air. The development of drying theory has stalled due to an unsolvable discrepancy between experimental results and analytical results. This study analyzes the effect of the binding energy of moisture in paddy rice on the diffusion coefficient. The theoretical relationship between water activity and drying rate in paddy rice was investigated, and the drying process was successfully explained by analyzing free energy transfer and transition theory. The mechanism of rice grain drying was described using a new theoretical solution for the drying process. These results provide new insights into the development of a scientific evaluation standard for assessing the efficiency of actual drying processes.
Keywords: paddy rice; free energy; drying technology; theoretical solution paddy rice; free energy; drying technology; theoretical solution

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MDPI and ACS Style

Wang, H.; Li, S.; Zhang, Y.; Ali, K.A.M.; Wu, W.; Li, C. The Analytical Theory of Water Activity in the Paddy Rice Drying Process. Agronomy 2024, 14, 1728. https://doi.org/10.3390/agronomy14081728

AMA Style

Wang H, Li S, Zhang Y, Ali KAM, Wu W, Li C. The Analytical Theory of Water Activity in the Paddy Rice Drying Process. Agronomy. 2024; 14(8):1728. https://doi.org/10.3390/agronomy14081728

Chicago/Turabian Style

Wang, Han, Shengtao Li, Ye Zhang, Khaled Abdeen Mousa Ali, Weihui Wu, and Changyou Li. 2024. "The Analytical Theory of Water Activity in the Paddy Rice Drying Process" Agronomy 14, no. 8: 1728. https://doi.org/10.3390/agronomy14081728

APA Style

Wang, H., Li, S., Zhang, Y., Ali, K. A. M., Wu, W., & Li, C. (2024). The Analytical Theory of Water Activity in the Paddy Rice Drying Process. Agronomy, 14(8), 1728. https://doi.org/10.3390/agronomy14081728

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