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Numerical Analysis on Heat Characteristics of the Ventilation Basket for Fresh Tea Leaves

文献类型： 外文期刊

作者： Zeng, Zhixiong 1 ; Jiang, Yihong 1 ; Ma, Chengying 3 ; Chen, Jin 1 ; Zhang, Xiaodan 1 ; Lin, Jicheng 1 ; Liu, Yanhua 1 ; Guo, Jiaming 1 ;

作者机构： 1.South China Agr Univ, Coll Engn, Guangzhou 510642, Peoples R China

2.Guangdong Lab Lingnan Modern Agr, Maoming Branch, Guangzhou 525000, Peoples R China

3.Guangdong Acad Agr Sci, Tea Res Inst, Guangzhou 510640, Peoples R China

关键词： numerical simulation; structure optimization; temperature characteristics; fresh keeping

期刊名称：FOODS （ 影响因子：5.561； 五年影响因子：5.94 ）

ISSN：

年卷期： 2022 年 11 卷 15 期

页码：

收录情况： SCI

摘要： Plastic baskets are commonly used as containers for fresh tea leaves during storage and transport after harvest. Nevertheless, there are significant challenges in controlling the core temperature of the basket since fresh tea leaves still maintain a certain degree of respiration after being harvested, with extremely high temperatures being the major factor for the color change of fresh tea leaves. A numerical model was developed to improve the temperature control of the plastic basket, by which the influence of different structural parameters on the core temperature in the plastic baskets with fresh tea leaves was analyzed. The accuracy of the model in predicting airflow and temperature distributions was validated against experimental data. The maximum RMSE was 1.158 degrees C and the maximum MRE was 5.410% between the simulated and test temperature value. The maximum deviation between the simulated velocity and test velocity was 0.11 m/s, the maximum RE was 29.05% and the maximum SD was 0.024. The results show that a plastic basket with a ventilation duct efficiently decreased the temperature of the fresh tea leaves and significantly affected the heat transfer between the fresh tea leaves and the ambient air compared to the plastic basket without a ventilation duct. Furthermore, the effect on the heat transfer was further expanded by the use of a plastic basket with a ventilation duct when the plastic baskets were stacked. The maximum temperature differences were 0.52 and 0.40 according to the stacked and single-layer products, respectively. The ambient temperature and the bulk density of the fresh tea leaves have a significant influence on the core temperature.

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