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Numerical modelling of thermal processes in Chinese cabbage cold storage chamber using variable turbulence models

机译:可变湍流模型中大白菜冷藏室热处理的数值模拟

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Losses of stored fruits and vegetables may occur mainly due to non-uniformity of theenvironmental conditions. Cooling air flow pattern in the cold storage chamber strongly depends onthe turbulence model applied. In modelling of mechanical ventilation standard k-ε model turbulencemodels is used routinely because of good convergence. However, this model is not able to predictthe flow rate of the air stream and is unable to reproduce the Coanda effect. In the paper theresults of numerical modelling of processes in cold storage chamber for vegetables are presented.The RANS turbulence models have been tested to determine the most appropriate ones for thestudied configuration. The highest difference of measured and computed temperature in the bulk ofvegetables is 0.40 K regardless of the turbulence model. Relative humidity difference variesbetween 4 and 13%. Tested turbulence models led to overprediction of air temperature andvelocity, however the SST k-ω model gives the best results.
机译:储存水果和蔬菜的损失可能主要由于不均匀的原因环境条件。冷藏室中的冷却空气流动模式强烈取决于湍流模型应用。机械通风标准K-γ模型湍流建模模型是由于良好的收敛而定期使用。但是,该模型无法预测空气流的流速,不能再现碳轭效应。在论文中介绍了蔬菜冷藏室中工艺数值建模的结果。已经测试了RAN湍流模型以确定最合适的模型学习配置。在大部分中测量和计算温度的最高差异无论湍流模型如何,蔬菜都是0.40克。相对湿度差异变化在4到13%之间。测试的湍流模型导致了空气温度的过度估计速度,但SST K-ï‰模型提供了最佳结果。

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