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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat and mass transfer on rectangular and annular finned surfaces of heat exchangers operating under frosting conditions
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Heat and mass transfer on rectangular and annular finned surfaces of heat exchangers operating under frosting conditions

机译：在结霜条件下运行的热交换器的矩形和环形翅片表面上的传热和传质

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摘要

The analysis of the process of frost formation on a cold surface exposed to humid air yields a system of differential equations. In this study, the orthogonal collocation method is used to help solve the system of equations resulting from the flow of humid air over heat exchanger fins maintained at a temperature below both the dew-point temperature of water vapor in air and the freezing point. The temporal dependence of the frost growth creates a moving boundary that is addressed using a front-fixing method. This proposed method allows solving for important variables such as frost thickness, temperature distribution, and heat flux through the frost layer. Model results were found to agree closely with available experimental data. In all data sets modeled, it was found that super saturation at the frost-air interface must be included in the model to accurately predict frost growth. (C) 2019 Elsevier Ltd. All rights reserved.
机译：对暴露于潮湿空气的寒冷表面上的霜形成过程的分析得出了一个微分方程组。在这项研究中，使用正交配置方法来帮助求解方程组，该方程组是由湿空气在热交换器翅片上的流动所保持的温度保持在空气中水蒸气的露点温度和冰点以下的温度。霜冻生长的时间依赖性产生了一个移动边界，该边界可以通过前端固定方法解决。提出的方法可以解决重要的变量，例如霜厚度，温度分布和穿过霜层的热通量。发现模型结果与可用的实验数据非常吻合。在所有建模数据集中，发现霜冻空气界面处的超饱和度必须包括在模型中以准确预测霜冻的增长。 （C）2019 Elsevier Ltd.保留所有权利。

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