Lattice Boltzmann modeling of boiling heat transfer: The boiling curve and the effects of wettability
Lattice Boltzmann modeling of boiling heat transfer: The boiling curve and the effects of wettability
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DOI：
10.1016/j.ijheatmasstransfer.2015.01.136
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发表时间：
2015-06-01
影响因子：
5.2
通讯作者：
Luo, K. H.
中科院分区：
文献类型：
--
作者：
Li, Q.;Kang, Q. J.;Luo, K. H.
提出了一种混合热晶格玻尔兹曼（LB）模型，以基于改进的赝势LB方法来模拟具有相变的热多相流（Li等人，2013年）。本模型不受杂散项所造成的强迫项的影响，这是遇到了一些以前的热LB模型的液-汽相变。利用该模型对汽液沸腾过程进行了模拟。沸腾曲线连同三个沸腾阶段（核态沸腾，过渡沸腾，和膜沸腾）的数值再现在LB社区的第一次。数值结果表明，该模型较好地反映了沸腾传热的基本特征和基本特性，如过渡沸腾过程中瞬态热流密度的剧烈波动和最大传热系数位于比最大热流密度更低的壁面处等。此外，还研究了加热表面润湿性对沸腾传热的影响。结果表明，接触角的增大促进了沸腾的发生，但降低了临界热流密度，使沸腾过程在较低的壁面高度处进入膜态沸腾，这与实验结果一致。(C)2015爱思唯尔有限公司版权所有。
A hybrid thermal lattice Boltzmann (LB) model is presented to simulate thermal multiphase flows with phase change based on an improved pseudopotential LB approach (Li et al., 2013). The present model does not suffer from the spurious term caused by the forcing-term effect, which was encountered in some previous thermal LB models for liquid-vapor phase change. Using the model, the liquid-vapor boiling process is simulated. The boiling curve together with the three boiling stages (nucleate boiling, transition boiling, and film boiling) is numerically reproduced in the LB community for the first time. The numerical results show that the basic features and the fundamental characteristics of boiling heat transfer are well captured, such as the severe fluctuation of transient heat flux in the transition boiling and the feature that the maximum heat transfer coefficient lies at a lower wall superheat than that of the maximum heat flux. Furthermore, the effects of the heating surface wettability on boiling heat transfer are investigated. It is found that an increase in contact angle promotes the onset of boiling but reduces the critical heat flux, and makes the boiling process enter into the film boiling regime at a lower wall superheat, which is consistent with the findings from experimental studies. (C) 2015 Elsevier Ltd. All rights reserved.