Improved modeling of heat transfer in dropwise condensation
Improved modeling of heat transfer in dropwise condensation
复制标题
改进了滴状冷凝传热模型
DOI：
10.1016/j.ijheatmasstransfer.2020.119719
复制
发表时间：
2020-07
影响因子：
5.2
通讯作者：
Yan Junjie
中科院分区：
文献类型：
--
作者：
Wang Jinshi;Ma Ziqiang;Li Gen;Sunden Bengt;Yan Junjie
与膜状冷凝相比，滴状冷凝由于其高效的传热性能而引起了人们的广泛关注。本文收集了光滑疏水表面滴状冷凝的典型实验数据，并对现有的典型传热模型进行了分析。预测结果与实验数据的对比表明，现有的模型并不能普遍适用于各种工况。建立了一个新的垂直光滑表面滴状冷凝传热模型。新模型基于核化冷凝机理，表面总传热包括通过所有液滴的热量和液滴之间通过表面的热量。对于通过液滴的潜热，在成核冷凝机理的基础上考虑了接触角的影响。表面上液滴之间的表面积被认为是裸露的表面，显热在裸露的表面和液滴表面上传递被视为强制对流换热。模型计算结果表明，虽然强制对流换热对实验参数有很大的依赖性，但它比通过液滴的潜热小3个数量级。结果表明，该模型具有较好的预测精度，对87.39%的数据预测误差在-35-20%之间，对90.37%的数据预测误差在-35-25%之间。结果表明，接触角对液滴的传热速率、临界成核半径和液滴尺寸分布有显著影响。事实上，较小的接触角增强了冷凝传热并增加了成核密度。此外，促进剂层的厚度减弱了冷凝传热，降低了形核密度。
Dropwise condensation has drawn significant attention due to its efficient heat transfer performance compared to filmwise condensation. In this paper, typical experimental data for dropwise condensation on smooth hydrophobic surfaces were collected as well as the typical available heat transfer models. The comparisons between the prediction results and the experimental data indicated that the existing models were not generally applicable to various conditions. A new model for a vertical smooth surface was developed to predict the heat transfer characteristics of dropwise condensation. The new model was based on the nucleation condensation mechanism, and the total heat transfer on the surface includes the heat through all the droplets and the heat through the surface between the droplets. For the latent heat through the droplets the effect of the contact angle was taken into consideration on the basis of the nucleation condensation mechanism. The surface area between the droplets on the surface was thought to be the bare surface, and sensible heat transferred on the bare surface and the droplets surface was viewed as forced convection heat transfer. The calculation results from the model show that, although the heat transferred by forced convection is greatly dependent on the experimental parameters, it is three orders of magnitude smaller than the latent heat through the droplets. Comparisons show that the present model has better prediction precision, with an error range of -35–20% for 87.39% of the data and an error range of -35–25% for 90.37% of the data. The findings obtained from the model suggest that the heat transfer rate and the critical nucleation radius for a single droplet and the droplet size distribution are remarkably affected by the contact angle. In fact, a smaller contact angle enhances the condensation heat transfer and increases the nucleation density. In addition, the thickness of the promoter layer weakens the condensation heat transfer and decreases the nucleation density.
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影响因子：
5.2
作者：
D. W. Tanner;D. Pope;C. J. Potter;D. West
通讯作者：
D. W. Tanner;D. Pope;C. J. Potter;D. West
影响因子：
5.2
作者：
Song Yongji;Xu Dunqi;L. Jifang;Tsian Siexong
通讯作者：
Song Yongji;Xu Dunqi;L. Jifang;Tsian Siexong
影响因子：
2.3
作者：
Manjinder Singh;Nilesh D. Pawar;S. Kondaraju;S. Bahga
通讯作者：
Manjinder Singh;Nilesh D. Pawar;S. Kondaraju;S. Bahga
DOI：
10.1016/j.ijheatmasstransfer.2005.08.016
发表时间：
2006-02
影响因子：
5.2
作者：
S. Vemuri;K. Kim
通讯作者：
S. Vemuri;K. Kim
影响因子：
15.1
作者：
Lan Zhong;Ma Xuehu;Li Xiaonan
通讯作者：
Li Xiaonan