New model for frost growth rate
New model for frost growth rate
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DOI：
10.1016/j.ijheatmasstransfer.2003.09.001
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发表时间：
2004-02-01
影响因子：
5.2
通讯作者：
Webb, RL
中科院分区：
文献类型：
--
作者：
Na, BC;Webb, RL
已经发表了许多预测霜冻生长的模型。这些模型可以分为经验模型和理论模型。所有以前的理论模型都假定水汽在气流和霜层之间的交界处是饱和的。本文提出了一种新的基于理论基础的霜层沉积与生长数值模型。本模型：(1)在霜面使用过饱和水汽，这是基本正确的；(2)改进了霜的导热系数关联式；(3)采用了合理的曲折因子；(4)计算了局部霜密度的变化。对于霜层生长速率的数值模拟，使用了测量的导热系数。测量了冷面上的结霜速率，并将实验数据与数值模型进行了比较，吻合程度在15%以内。将所提出的过饱和模型与前人的实验数据进行了比较，发现过饱和模型优于假设霜面水汽为饱和的解析或数值模型。(C)2003爱思唯尔有限公司。保留所有权利。
Many models have been published to predict frost growth. These may be divided into empirical and theoretical models. All prior theoretical models assume the water vapor is saturated at the interface between the air stream and frost layer. This paper provides a new theoretically based numerical model of frost deposition and growth. The present model: (1) uses supersaturated water vapor at the frost surface, which is fundamentally correct; (2) improved correlations for frost thermal conductivity; (3) uses a rationally based tortuosity factor; and (4) calculates the local frost density variation. For numerical simulation of the frost growth rate, the, measured thermal conductivity was used. Frost growth rate on a cold surface was measured, and the experimental data were compared to the numerical model and agreed within 15%. The proposed supersaturation model was also compared to previous investigators' experimental data, and it was found that the supersaturation model is superior to analytical or numerical models that assume the water vapor at the frost surface to be saturated. (C) 2003 Elsevier Ltd. All rights reserved.