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首页> 外文期刊>International Journal of Heat and Mass Transfer >Frost behavior on a fin considering the heat conduction of heat exchanger fins
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Frost behavior on a fin considering the heat conduction of heat exchanger fins

机译：考虑热交换器翅片的导热性的翅片结霜行为

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摘要

A mathematical model is proposed for predicting frost behavior on a heat exchanger fin under frosting conditions, taking into account fin heat conduction. The change in the three-dimensional airside airflow caused by frost growth is reflected in this model. The numerical estimates of frost thickness are consistent with experimental data, with an error of less than 10%. Due to fin heat conduction, frost thickness decreases exponentially toward the fin tip, while considerable frost growth occurs near the fin base. When a constant fin surface temperature is assumed, the predicted frost thickness was larger by more than 200% at maximum, and the heat flux by more than 10% on average, compared to results obtained with fin heat conduction taken into account. Therefore, fin heat conduction could be an essential factor in accurately predicting frost behavior. To improve prediction accuracy under the assumption of constant fin surface temperature, the equivalent temperature (for predicting frost behavior) is defined to be the temperature at which the heat transfer rate neglecting fin heat conduction is the same as the heat transfer rate with fin heat conduction taken into consideration. Finally, a correlation for predicting the equivalent temperature is suggested.
机译：考虑到散热片的热传导，提出了一个数学模型来预测结霜条件下热交换器散热片的结霜行为。该模型反映了由霜冻生长引起的三维空气流的变化。霜冻厚度的数值估计与实验数据一致，误差小于10％。由于鳍片导热，霜厚度朝着鳍尖呈指数减小，而在鳍片基部附近出现相当大的霜冻增长。与翅片导热相比，当假定翅片表面温度恒定时，预计的霜冻厚度最大增加200％以上，平均热通量增加10％以上。因此，翅片导热可能是准确预测霜冻行为的重要因素。为了在翅片表面温度恒定的情况下提高预测精度，将等效温度（用于预测霜冻行为）定义为忽略翅片导热的传热速率与翅片导热的传热速率相同的温度。考虑到。最后，提出了用于预测等效温度的相关性。

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