Prediction of dryout and post-dryout heat transfer using a two-phase CFD model
Prediction of dryout and post-dryout heat transfer using a two-phase CFD model
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DOI：
10.1016/j.ijheatmasstransfer.2016.04.021
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发表时间：
2016-08
影响因子：
5.2
通讯作者：
Haipeng Li;H. Anglart
中科院分区：
文献类型：
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作者：
Haipeng Li;H. Anglart
本研究的重点是建立一个包括从环雾状态到雾状态的干燥区在内的非绝热高质量两相流的集成CFD模型。建立了一个统一的三场CFD模型，考虑液滴、气体和液膜，用于模拟干燥前后区域，并使用局部模型来确定干燥发生情况。将液膜模型与气芯流动模型耦合，采用欧拉-欧拉方法进行描述。对于干后区域，确定壁面、气相和液滴之间的各种传热传质机制，包括壁面-气对流换热、液滴蒸发换热、液滴-壁面直接接触换热和热辐射换热，计算壁面和流体的温度。最令人感兴趣的是，干燥后传热实验的干燥位置和壁温测量已用于验证。仿真结果表明，使用现有模型可以很好地捕捉到剧烈的温度偏移。然而，将继续进行更多的工作来提高结果的准确性。
This study focuses on development of an integrated CFD model for diabatic high quality two-phase flow including tarns-dryout regions from annular-mist regime to mist regime. One unified three-field CFD model accounting for droplets, gas, and liquid film was developed to simulate both pre and post dryout regions, with local models to determine the dryout occurrence. The thin liquid film model was coupled to the gas core flow model, which is described using the Eulerian–Eulerian approach. For the post-dryout region, the various heat and mass transfer mechanisms between the wall, the gas phase, and the droplets were identified, including the wall-gas convective heat transfer, the droplet evaporation, the droplet-wall direct contact heat transfer and the thermal radiation, to calculate the temperature of the wall and the fluid. Of the most interests, dryout location and wall temperature measurements from a post-dryout heat transfer experiment have been used for the validation. Simulation results show that the dramatic temperature excursion could be well captured using current models. Nevertheless, more work will be continued to improve the accuracy of the results.