Experimental study and numerical simulation of resistance to airflow in a storage bin of rough rice with three inlet duct configurations

Razavizadeh, Naser; Zare, Dariush; Nassiri, Seyed Mehdi; Karim, Azharul; Eslami, M. R.; Nematollahi, Mohammad Amin

doi:10.1016/j.biosystemseng.2022.12.003

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…Considering the impact of hot air duct configurations, our findings showed that the method involving perforated sub-pipe distribution required approximately 96 h to achieve the target moisture content. In contrast, the system utilizing the main duct at the entrance proved to be more efficient, completing the drying process in roughly 84 h. The extended drying period associated with the perforated sub-air ducts can be attributed to a larger pressure drop within the drying system, as opposed to using the primary air pipe [ 3 ]. This is because the presence of the sub-air duct system causes the hot air to disseminate more slowly across the different layers of the rice stack, resulting in a more prolonged drying process.…”

Section: Resultsmentioning

confidence: 99%

“…This is because the presence of the sub-air duct system causes the hot air to disseminate more slowly across the different layers of the rice stack, resulting in a more prolonged drying process. According to Razavizadeh et al [ 3 ], this larger pressure drop, especially noted in configurations such as the F-duct due to increased turbulence and swirling, leads to slower hot air dissemination across the rice stack layers, thereby extending the drying duration. The H-duct configuration is recommended to minimize blind zones and ensure more uniform air distribution during continuous aeration processes, aligning with our objective to enhance drying efficiency and uniformity [ 3 , 18 ].…”

Section: Resultsmentioning

confidence: 99%

“…The fascinating interplay between outdoor weather elements and the preservation of grains within is a subject of deep interest. As highlighted by researchers such as Razavizadeh et al [ 3 ] and Scariot et al [ 4 ], the effectiveness of these drying methods is pivotal in determining essential grain quality indicators. Notably, attributes like head rice yield and the visual appeal of whiteness, which often shape consumer preferences and market value, are influenced by these processes.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Paddy Rice Preservation in Small-Scale Barns: Comparative Analysis of Hot Air-Drying Techniques and Ventilation Impact on Quality and Energy Efficiency

Duangkhamchan,

Huangsaeng,

Kondo

et al. 2024

Foods

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This investigation explores the effectiveness of hot air-drying and ambient ventilation techniques in enhancing the storage quality of Khao Dok Mali 105 paddy rice within small-scale barns in Northeast Thailand. Through comprehensive analysis of moisture and temperature dynamics, the research revealed that an optimized main air pipe system significantly reduces moisture content from 25% db to a desirable 16% db, outperforming alternative systems. Spatial assessments within the barn highlighted the importance of placement, showing that front sections achieved lower moisture levels. This underscores the need for uniform moisture distribution and temperature management to prevent quality degradation. Notably, after 84 h of drying, variations in moisture content across different barn locations emphasized the critical role of environmental control. These insights pave the way for advancing grain storage practices, focusing on strategic ventilation and environmental monitoring to ensure rice quality over time. This study not only challenges traditional methods but also offers significant practical implications for optimizing small-scale rice storage, providing a pathway towards sustainable post-harvest processing in resource-constrained environments.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing Paddy Rice Preservation in Small-Scale Barns: Comparative Analysis of Hot Air-Drying Techniques and Ventilation Impact on Quality and Energy Efficiency

Duangkhamchan,

Huangsaeng,

Kondo

et al. 2024

Foods

View full text Add to dashboard Cite

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“…The FAO-developed metal silos have gained significant popularity in Kenya and Mozambique for their nearly complete elimination of insect-related losses [ 91 ]. These silos are suitable and cost-effective for small-scale storage [ 92 , 93 , 94 ].…”

Section: Postharvest System Elements Impacts Losses and Mitigation St...mentioning

confidence: 99%

Research and Technologies to Reduce Grain Postharvest Losses: A Review

Nath,

Chen,

O’Sullivan

et al. 2024

Foods

Self Cite

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Reducing postharvest losses offers a significant opportunity to enhance food availability without requiring extra production resources. A substantial portion of cereal grain goes to waste annually due to a lack of science-based knowledge, unconscious handling practices, suboptimal technical efficiency, and inadequate infrastructure. This article extensively reviews losses occurring during postharvest operations across various crops, examining diverse postharvest operations in different countries. Recent advancements in postharvest technology research are thoroughly discussed. The primary obstacles and challenges hindering the adoption and implementation of postharvest technologies are also explored. The appropriate postharvest technology relies on specific factors, including the kind of crops, production locales, seasons, and existing environmental and socioeconomic conditions.

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“…Grain aeration is a crucial method for preserving grain quality, but the uniformity of the airflow through the bulk grain during the aeration process can affect the temperature distribution and cause local hotspots and other issues (Binelo et al, 2019; Khatchatourian et al, 2009). In an aeration system with a duct configuration, lower airflow areas exist away from the ducts (Moses et al, 2014; Panigrahi et al, 2021; Razavizadeh et al, 2023). According to Olatunde et al's (2016) research, the airflow velocity range for aeration in grain storage is 1–2 L/(s·m 3 ), and stagnant zones are characterized by airflow velocities below this range, which may be caused by changes in the porosity of the grain pile, the depth of the pile, and the layout of the duct configuration.…”

Section: Introductionmentioning

confidence: 99%

An improved anisotropic continuum model for the flow and heat transfer in grain aeration system

Liu

Chen

Zheng

et al. 2023

J Food Process Engineering

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To investigate the influence of pore structure distribution on the flow and heat transfer during the aeration process of a grain pile, an anisotropic continuous model (ACM) was developed based on the homogeneous continuous model (HCM). The improved ACM includes spatial resistance factors and effective thermal conductivity correction coefficients. The experimental results were compared with the particle‐resolved computational fluid dynamics (PRCFD) and ACM simulation results to verify the accuracy. At higher inlet velocities, the HCM underestimated the pressure drop in the wheat fixed bed, with an average deviation of 21%. In contrast, the improved ACM incorporates the effect of resistance factors and had an average deviation of less than 10% from the experimental. By simulating the pilot‐scale bin aeration system, the accuracy of the improved ACM applied to the real bin was ensured, considering the change in the porosity of the grain pile along the center of the bin to the bin wall and the grain pile height direction. The range of variable porosity distribution was set at .35–.45, and the total average deviation between the ACM simulation static pressure and the experimental value was 9.7% when the inlet airflow velocity was .019 m/s. The simulated temperature of the ACM matches the measured temperature better compared to the temperature values of the grain pile at different heights in the HCM with a constant porosity of .45. Therefore, the impact of four central air collection duct forms on airflow and temperature was discussed, and it was determined that the pipe with a larger diameter at the top and a smaller diameter at the bottom air collection duct was more advantageous when used in a horizontal aeration system by applying the improved ACM to different scenarios.Practical ApplicationsThis study introduces the resistance factor and effective thermal conductivity in a laboratory‐scale fixed bed of wheat. An improved anisotropic continuous model was established for simulating the flow and heat transfer in the fixed bed during the aeration process. The improved anisotropic continuous model accurately reflected the non‐uniformity of fixed bed flow and temperature transfer in the fixed bed. This model can be employed for simulating flow and heat transfer in large‐scale actual storage systems characterized by heterogeneous pore distribution, while ensuring appropriate computational efficiency and precision.

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Experimental study and numerical simulation of resistance to airflow in a storage bin of rough rice with three inlet duct configurations

Cited by 12 publications

References 39 publications

Enhancing Paddy Rice Preservation in Small-Scale Barns: Comparative Analysis of Hot Air-Drying Techniques and Ventilation Impact on Quality and Energy Efficiency

Enhancing Paddy Rice Preservation in Small-Scale Barns: Comparative Analysis of Hot Air-Drying Techniques and Ventilation Impact on Quality and Energy Efficiency

Research and Technologies to Reduce Grain Postharvest Losses: A Review

An improved anisotropic continuum model for the flow and heat transfer in grain aeration system

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