Intermittent dewetting and dryout of annular flows
Intermittent dewetting and dryout of annular flows
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DOI：
10.1016/j.ijmultiphaseflow.2014.04.009
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发表时间：
2014-12-01
影响因子：
3.8
通讯作者：
Thome, John Richard
中科院分区：
文献类型：
--
作者：
Borhani, Navid;Thome, John Richard
利用高速数码相机对R245fa制冷剂在低质量通量和中等均匀热流密度条件下，在硅并联多微通道蒸发器内的饱和流动沸腾过程进行了可视化研究。利用时间条技术对所记录的图像序列进行后处理，揭示了环空流动间歇干燥机理的深刻细节。这些观察到的现象的特征已经成功地与剪切作用下破裂的亚稳液膜的动力学相关联。这些观测结果可以作为发展新的机械临界热流密度预测模型和设计未来高热流密度装置的基础。该研究还揭示了液滴夹带沉积过程和极薄环状液体膜中核沸腾的性质。(C) 2014 Elsevier Ltd.版权所有。
Flow visualisation of saturated flow boiling of refrigerant R245fa in a silicon parallel multi-microchannel evaporator, at low mass flux and moderate uniform heat flux, has been carried out with a high-speed digital camera. Using the time-strip technique to post-process the recorded image sequences has revealed profound details regarding the intermittent dryout mechanism of annular flows. Features of these observed phenomena have been successfully correlated with the dynamics expected from a ruptured metastable liquid film under shear. These observations can act as a basis for the development of new mechanistic critical heat flux prediction models and the design of future high heat flux devices. This study also reveals details concerning the nature of the droplet entrainment-deposition process and nucleate boiling in very thin annular liquid films. (C) 2014 Elsevier Ltd. All rights reserved.