Modeling the breakup of fluid particles in turbulent flows
Modeling the breakup of fluid particles in turbulent flows
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DOI：
10.1002/aic.10832
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发表时间：
2006-06
期刊：
影响因子：
3.7
通讯作者：
Ronnie Andersson;B. Andersson
中科院分区：
文献类型：
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作者：
Ronnie Andersson;B. Andersson
本文提出了一个湍流中流体颗粒破碎的模型。在新的模型中，两个标准，一个应力和一个能量标准，需要满足破碎发生。本文还介绍了一种新的计算流体颗粒与湍流涡旋相互作用频率的模型。模型的分析表明，漩涡的大小接近，最多三倍大于流体颗粒的整体破碎率的贡献。这就解释了作者和其他研究人员最近在文献中提出的实验结果，即流体颗粒在破碎发生之前通常会显著变形。一个高速成像技术，4000赫兹，被用来直接测量破碎率，而不引入假设的女儿的大小分布和破碎后形成的碎片的数量。这些测量的验证表明，新模型给出了很好的预测。© 2006美国化学工程师学会。
A model for breakup of fluid particles in turbulent flows is presented in this article. In the new model two criteria, one stress and one energy criteria, are required to be fulfilled for breakup to occur. A new model for interaction frequency between fluid particles and turbulent eddies is also introduced. Analysis of the model reveals that eddies close in size and up to three times larger than the fluid particle contribute most to the overall breakup rate. This explains the experimental findings by the authors and by other researchers presented recently in the literature that fluid particles often deform significantly before breakup occurs. A high-speed imaging technique, 4000 Hz, was used to measure the breakup rate directly without introducing assumptions regarding the daughter size distributions and the number of fragments formed upon breakup. Validation with these measurements shows that the new model gives excellent predictions. © 2006 American Institute of Chemical Engineers.