Abstract Ozone gas (O3) is a prominent alternative for the integrated pest management of stored products. The present study fitted a computational fluid dynamics (CFD) model to elucidate the ozone gas flow dynamics in an aeration system, at a lethal concentration for Sitophilus zeamais Mots in rice grains. First, an experiment was carried out to understand the flow of ozone gas (2.2 mg L−1; 2 L min−1) in a cylindrical PVC column filled with 4 kg of rice grains. The ozone gas concentration was monitored every 12 h, at a point immediately above the grains. The gas flow was modeled using the CFD technique. The parameters used to feed the model and adjust it to the experimental data were the mass transfer coefficient and ozone-rice grain reaction constant. Then, a simulation of ozone gas injection in a silo with a static capacity of 69.6 tons of rice was performed. In the ozone gas injection experiment, 100% of insect mortality was observed on the sixth day, when the O3 concentration reached 0.1 mg L−1. In this case, the mass transfer coefficient was 0.55 m s−1, and the reaction constant was 0.78 s−1. At the concentration of 0.8 mg L−1, it is possible to treat 69.6 tons of rice grains within 9 days.

中文翻译：

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控制水稻籽粒中玉米粒霉的臭氧气流CFD模拟

摘要 臭氧气体 (O3) 是存储产品有害生物综合治理的重要替代方案。本研究拟合了计算流体动力学 (CFD) 模型，以阐明曝气系统中的臭氧气流动力学，在稻谷中 Sitophilus zeamais Mots 的致死浓度下。首先，进行了一项实验以了解臭氧气体（2.2 mg L-1；2 L min-1）在装有 4 kg 米粒的圆柱形 PVC 柱中的流量。每 12 小时监测一次臭氧气体浓度，监测点位于颗粒正上方。气流是使用 CFD 技术模拟的。用于输入模型并将其调整为实验数据的参数是传质系数和臭氧-稻谷反应常数。然后，模拟静态容量为 69 的筒仓中的臭氧气体注入。进行了6吨大米。在臭氧气体注入实验中，当 O3 浓度达到 0.1 mg L−1 时，观察到第 6 天昆虫死亡率为 100%。在这种情况下，传质系数为 0.55 m s-1，反应常数为 0.78 s-1。在0.8 mg L-1的浓度下，9天内可处理69.6吨米粒。