Droplet-wall interaction upon impingement of heavy hydrocarbon droplets on a heated wall
Droplet-wall interaction upon impingement of heavy hydrocarbon droplets on a heated wall
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DOI：
10.1016/j.ces.2015.03.012
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发表时间：
2015-07-07
影响因子：
4.7
通讯作者：
Heynderickx, Geraldine J.
中科院分区：
文献类型：
--
作者：
Mahulkar, Amit V.;Marin, Guy B.;Heynderickx, Geraldine J.
采用流体体积模型和地质重构方案，在CM模拟的基础上，构建了预测重烃液滴撞击加热壁面行为的状态图（撞击液滴的韦伯数v/s壁面温度）。基于模拟结果，构建了直径为50 pm和100 pm的单组分液滴分布图。通过将所应用的CFD模型与文献中基于模型液体和液体混合物实验数据构建的状态图进行比较，验证了所应用的CFD模型。溅射、棍击、反弹和破碎的撞击方式都得到了很好的预测。两种不同类型的飞溅（飞溅韧带形成和飞溅环脱离）首次报道。利用经过验证的CFD模型，构建了直径为50 μ m和100 μ m的多组分重烃液滴的状态图，观察到单组分和多组分液滴撞击行为的显著差异。在能量平衡的基础上，对状态转换、液滴在壁上的拉伸、液滴的反弹速度和溅射液滴的数量进行了改进和新的关联。它们被发现与CFD预测有很好的相关性。(C) 2015 Elsevier Ltd.版权所有。
Regime maps that predict the heavy hydrocarbon droplet impingement behavior on a heated wall (Weber number of the impinging droplet v/s wall temperature) are constructed based on CM simulations using the Volume of Fluid model with the geo-reconstruct scheme. Based on the simulation results, maps are constructed for single-component droplets with a diameter of 50 and of 100 pm. The applied CFD model is validated by comparing these with regime maps available in literature, constructed based on experimental data for model liquids and liquid mixtures. The impingement regimes of Splash, Stick, Rebound and Breakup are well-predicted. Two distinct types of Splash (Splash with ligament formation and Splash with ring detachment) are reported for the first time. Using the validated CFD model, regime maps are constructed for multi-component heavy hydrocarbon droplets with a diameter of 50 and of 100 mu m. Significant differences between the single-component and the multi-component droplet impact behavior are observed. Improved and new correlations for regime transitions, droplet stretching on the wall, droplet rebounding velocity and number of splashed droplets are derived based on energy balances. They are found to correlate well with CFD predictions. (C) 2015 Elsevier Ltd. All rights reserved.