Application of a drop breakage model using the full energy spectrum and a specific realisation of turbulence anisotropy
Application of a drop breakage model using the full energy spectrum and a specific realisation of turbulence anisotropy
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DOI：
10.1016/j.ces.2021.116702
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发表时间：
2021-04
影响因子：
4.7
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
将各向异性液滴破碎模型应用于高压均质器中湍流乳化的CFD-PBM模拟。我们比较指数的索特平均直径压降的相关性与发表的实验结果和指数使用现有的下降破碎模型。假设均匀各向同性湍流，其理论值为-0.6，而实验表明指数的幅度较小。使用各向同性湍流的全谱的破损频率模型被发现产生的指数值接近-0.6。我们新开发的各向异性破碎模型预测的指数较小的幅度，更接近实验。基于各向同性湍流的破碎频率表现出非单调行为（通过预测特定液滴尺寸的最大值）;湍流各向异性的影响是减少非单调性。结果表明，这种减少非单调性的驱动器的指数的幅度下降。
An anisotropic drop breakage model is applied to CFD–PBM simulations of turbulent emulsification in a high–pressure homogeniser. We compare the exponent of Sauter mean diameter–pressure drop correlations with published experimental results and with exponents obtained using existing drop breakage models. Its theoretical value assuming homogeneous isotropic turbulence is-0.6, while experiments have shown exponents of smaller magnitude. A breakage frequency model using the full spectrum of isotropic turbulence is found to produce a value of the exponent near-0.6. Our newly developed anisotropic breakage model predicts an exponent of smaller magnitude, closer to experiments. Breakage frequency based on isotropic turbulence exhibits non–monotonic behaviour (by predicting a maximum value for a certain drop size); the effect of turbulence anisotropy is to reduce non–monotonicity. It is shown that this reduction in non–monotonicity drives the decrease in the magnitude of the exponent.