Moisture transport and stress development in rice during drying, a Hybrid Mixture Theory-based model

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
Fidèle Abédi, Sunil Kumar, N. Kumar, Deepak Kumar, P. Takhar
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引用次数: 0

Abstract

Abstract Internal fluid flow during rice drying generates a stress gradient inside the material. If the stress gradient becomes too large or certain rice layers undergo glass transition under a significant stress gradient, stress cracks can form. In this study, modeling equations based on the Hybrid Mixture Theory were solved to simulate moisture transport and the viscoelastic stress that occurs during rice drying. The model’s accuracy was evaluated using experimental moisture content data for two rice varieties: Pusa Basmati 1121 (MAEs: 0.0079–0.0162 g/g solids) and California M206 (MAEs: 0.0022–0.0061 g/g solids). Simulations were then conducted under continuous and time-varying drying conditions to determine the best drying strategy for minimizing stress crack formation. The results showed that gradually increasing the inlet air temperature by 5 °C every 5 min after an initial 28.5 min at 40 °C could reduce stress crack formation effectively while drying rice in only 38.5 min.
水稻干燥过程中水分运移与胁迫发展——基于杂交理论的模型
大米干燥过程中内部流体的流动会在物料内部产生应力梯度。如果应力梯度过大或某些米层在较大的应力梯度下发生玻璃化转变,就会形成应力裂纹。本文基于杂化理论求解了水稻干燥过程中水分运移和粘弹性应力的模型方程。利用两个水稻品种:Pusa Basmati 1121 (MAEs: 0.0079-0.0162 g/g固体)和California M206 (MAEs: 0.0022-0.0061 g/g固体)的实验水分含量数据,对模型的准确性进行了评估。然后在连续和时变干燥条件下进行了模拟,以确定最小应力裂纹形成的最佳干燥策略。结果表明,在40℃条件下,在初始28.5 min后,每5 min逐步提高5℃,可以有效减少应力裂纹的形成,而干燥时间仅为38.5 min。
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来源期刊
Drying Technology
Drying Technology 工程技术-工程:化工
CiteScore
7.40
自引率
15.20%
发文量
133
审稿时长
2 months
期刊介绍: Drying Technology explores the science and technology, and the engineering aspects of drying, dewatering, and related topics. Articles in this multi-disciplinary journal cover the following themes: -Fundamental and applied aspects of dryers in diverse industrial sectors- Mathematical modeling of drying and dryers- Computer modeling of transport processes in multi-phase systems- Material science aspects of drying- Transport phenomena in porous media- Design, scale-up, control and off-design analysis of dryers- Energy, environmental, safety and techno-economic aspects- Quality parameters in drying operations- Pre- and post-drying operations- Novel drying technologies. This peer-reviewed journal provides an archival reference for scientists, engineers, and technologists in all industrial sectors and academia concerned with any aspect of thermal or nonthermal dehydration and allied operations.
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