Influence of energy spectrum distribution on drop breakage in turbulent flows
Influence of energy spectrum distribution on drop breakage in turbulent flows
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DOI：
10.1016/j.ces.2014.06.018
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发表时间：
2014-09
影响因子：
4.7
通讯作者：
Luchang Han;Shenggao Gong;Yongqiang Li;Ningning Gao;Jin Fu;He’an Luo;Zhifen Liu
中科院分区：
文献类型：
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作者：
Luchang Han;Shenggao Gong;Yongqiang Li;Ningning Gao;Jin Fu;He’an Luo;Zhifen Liu
本文主要研究了湍流中能谱分布对水滴破碎的影响。提出了一种基于广义能谱函数的改进断裂模型。它可以与可用的能谱形式相结合，并且可以应用于更广泛的操作条件，例如更大的液滴尺寸范围。与以往只考虑惯性子范围谱的工作不同，本文在宽能谱的框架下模拟了断裂，说明了考虑宽能谱分布的必要性。与宽能谱函数相结合的改进模型可以从理论上解释maasß和Kraume（2012）最近观察到的实验现象。用单滴试验测定破损率。化学。Eng。科学通报，30(4):444 - 444。即随着母粒尺寸的增大，破碎频率先增大到最大值，然后减小。这是因为非单调能谱函数可以区分三个谱范围，即含能范围、惯性子范围和耗散范围，在本工作中不再需要母滴尺寸始终落在惯性子范围内的处理。当仅将惯性子范围的能谱应用于整个涡流尺寸范围时，预测的破碎频率随母滴直径单调增加。因此，能谱分布对破碎频率随母粒尺寸的变化有至关重要的影响。
This work focused on the influence of energy spectrum distribution on drop breakage in turbulent flows. An improved breakage model in terms of general energy spectrum function was presented. It can be coupled with available forms of energy spectrum and can be applied to the wider operating conditions such as the wider size range of drops. Unlike previous work that only considered the inertia subrange spectrum, this work simulated the breakage in the framework of wide energy spectrum and accounted for the necessity of considering the wide energy spectrum distribution. The improved model coupled with wide energy spectrum function can theoretically explain the recent experimental phenomena observed by Maaß and Kraume, 2012. Determination of breakage rates using single drop experiments. Chem. Eng. Sci. 70, 146–164. That is, breakage frequency increases to a maximum and then decreases with increasing parent drop size. This is because the non-monotone energy spectrum function can distinguish three spectrum ranges, i.e., containing-energy range, inertia subrange and dissipation range, and the treatment that parent drop size always falls in the inertia subrange is no longer required in this work. While when only the energy spectrum of inertia subrange is applied to the whole size range of eddies, the predicted breakage frequency monotonously increases with parent drop diameter. Therefore, the energy spectrum distribution has a crucial influence on the evolution of the breakage frequency with parent drop size.