Simulation of Turbulent Emulsification in a Sonolator Mixer: Interpretation of Drop Breakage Time
Simulation of Turbulent Emulsification in a Sonolator Mixer: Interpretation of Drop Breakage Time
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DOI：
10.1002/ceat.201800717
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发表时间：
2019-08
影响因子：
2.1
通讯作者：
Ioannis Bagkeris;V. Michael;R. Prosser;A. Kowalski
中科院分区：
文献类型：
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作者：
Ioannis Bagkeris;V. Michael;R. Prosser;A. Kowalski
采用计算流体力学和种群平衡方法研究了稀释乳剂在ACIP2型Sonolator中的模拟。采用了两种不同的破损频率模型来表达跌落破损时间。基于均匀各向同性湍流（HIT）的液滴破碎模型与实验结果吻合较差；用Alopaeus等人的经验模型进行模拟得到了更好的一致性。通过对经典HIT谱的扰动，表明经验模型中的断裂时间对应于一个非各向同性能谱。在a型Sonolator的非各向同性近场中观察到了这样的光谱，这为为什么经验模型比基于HIT的模型表现得更好提供了一个合理的解释。
The simulation of dilute emulsions in a model ACIP2 Sonolator is investigated using computational fluid dynamics and population balance methods. Two breakage frequency models are used that differ in the expression of the drop breakage time. Drop breakage modeling based on homogenous isotropic turbulence (HIT) shows poor agreement of the Sauter mean diameter when compared to the experiments; simulations with the empirical model from Alopaeus et al. yield better agreement. By perturbing the classical HIT spectrum, it is shown that the breakage time in the empirical model corresponds to a non‐isotropic energy spectrum. Such spectra have been observed in the non‐isotropic near field in a model A Sonolator, which provides a plausible explanation of why the empirical model performs better than the HIT‐based model.