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首页> 外文会议>American Society of Agricultural and Biological Engineers Annual International Meeting >Evaluation of heat transfer inside the phloem of a tree during heat treatment of HLB-affected citrus tree by CFD
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Evaluation of heat transfer inside the phloem of a tree during heat treatment of HLB-affected citrus tree by CFD

机译：CFD在热处理HLB影响柑橘树的热处理中的热传递热传递评估

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Thermotherapy, as a non-chemical method has been applied to treat infected plants/trees with heat sensitive pathogen. Huanglongbing (HLB) is one of these heat sensitive pathogens and the required temperature for killing HLB was estimated at 54°C for60 to 120 s during indoor experimental studies. However, utilizing this method in the field is difficult due to technical difficulties with regards covering a large tree. Recently, we developed a mobile heat treatment machine to treat in-field HLB-infected trees. This device includes a mobile tent that cover the infected tree, and steam is injected into the tent to treat a tree. Although the temperature inside the tent is raising up, the heat should penetrate inside the phloem where the bacteria lives.Therefore, measuring the heat penetration inside the tree is very critical to evaluate the performance of the mobile thermotherapy system. In this study, this mobile thermotherapy system was utilized to in-field treat HLB-affected trees and raise temperature inside the tent to 54°C. To measure the temperature in the phloem, holes were drilled in tree branches, with different diameters, and tree trunks. K-type thermocouples were installed inside and outside of the holes. Furthermore, a thermodynamic model was developed to simulate the heat distribution inside the phloem. Initial experiments showed that the temperature in the phloem was 10-40% lower than the temperature on the bark (near branch's surface). The heat transfer model was developed by comparative analysis of the experimental data. ANSYS software was used to simulate heat transfer; simulation results were consistent with experimental results, with an average relative error less than 5%.
机译：作为一种非化学方法，热疗法已被应用于用热敏病原体治疗感染的植物/树木。黄龙堡（HLB）是这些热敏病原体之一，在室内实验研究期间，在54℃变化60℃下估计杀灭HLB所需的温度。然而，利用该方法在该领域是由于关于覆盖大树的技术困难而困难。最近，我们开发了一种移动热处理机，以治疗现场HLB感染的树木。该装置包括覆盖受感染树的移动帐篷，并且蒸汽注入帐篷以处理树。虽然帐篷内的温度升高，但热量应渗透细菌生活的韧皮疙瘩内。因此，测量树内的热渗透对于评估移动热疗系统的性能非常重要。在本研究中，这种移动热疗系统用于现场治疗HLB受影响的树木，并在帐篷内升温至54°C。为了测量Phloem中的温度，在树枝上钻孔，具有不同的直径和树干。 K型热电偶安装在孔的内部和外部。此外，开发了一种热力学模型来模拟韧皮内部的热分布。初步实验表明，韧皮柱的温度低于树皮上的温度（在临近分支表面）的温度下为10-40％。通过对实验数据的比较分析开发了传热模型。 ANSYS软件用于模拟传热;仿真结果与实验结果一致，平均相对误差小于5％。

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