点击次数：

论文类型：期刊论文

发表时间：2011-03-01

发表刊物：APPLIED THERMAL ENGINEERING

收录刊物：SCIE、EI

卷号：31

期号：4

页面范围：447-457

ISSN号：1359-4311

关键字：Frost formation and growth; Nucleation theory; CFD; Numerical simulation

摘要：In this paper, a new CFD (Computational Fluid Dynamics) model is proposed to predict frost formation and growth with the benefit of the nucleation theory. This model can be applied to describe the initial and growth period of frost formation and also to reflect the influence of surface structure on frost development. Both spatial and temporal variation of the frost configuration and its properties can be predicted. The phenomena of frost formation on a cold surface placed in a stream of humid air are simulated using this model. The proposed model is validated in comparison with data arising from one experiment and two accepted numerical models. The results show that the frost grows faster in the upstream region. In the initial period, the mass transfer, from water vapor to frost layer, mainly contributes to the increase of frost thickness. In contrast, it mainly contributes to the increase of density in the fully developed period. The effects of inlet air velocity are discussed as well. (C) 2010 Elsevier Ltd. All rights reserved.