Aerosol nucleation and growth in a turbulent jet using the Stochastic Fields method
Aerosol nucleation and growth in a turbulent jet using the Stochastic Fields method
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DOI：
10.1016/j.ces.2008.05.012
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发表时间：
2008-08
影响因子：
4.7
通讯作者：
A. Garmory;E. Mastorakos
中科院分区：
文献类型：
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作者：
A. Garmory;E. Mastorakos
湍流反应流的随机场输运PDF方法已被用来模拟邻苯二甲酸酯颗粒的成核和生长的热，湍流射流在一个较冷的背景下，实验数据是可用的。气溶胶人口建模使用假设的对数正态分布。已经发现，忽略湍流波动的影响导致预测的峰值颗粒浓度太接近射流和下游浓度预测不足。然而，与调整模拟表面张力的效果相比，这种效果很小。只有通过调整这一点，才有可能正确地再现实验中发现的粒子数的下游演变。在射流中心，颗粒质量平均直径被显著低估，这可能是由于对数正态分布无法详细捕获分布。考虑到湍流波动导致羽流边缘的平均粒径增加。这种增加的程度在很大程度上取决于微观混合时间尺度的选择。
The Stochastic Fields transported PDF method for turbulent reacting flows has been used to model the nucleation and growth of dibutyl phthalate particles in a hot, turbulent jet in a colder background for which experimental data is available. The aerosol population is modelled using an assumed log-normal size distribution. It has been found that neglecting the effect of turbulent fluctuations leads to the peak particle concentration being predicted too close to the jet and the concentration downstream underpredicted. However, this effect was small compared to that of adjusting modelled surface tension. Only by adjusting this was it possible to reproduce correctly the downstream evolution of particle number found in experiment. Particle mass mean diameter was significantly underpredicted at the centre of the jet, which may be due to the inability of log-normal size distribution to capture the distribution in detail. Taking account of turbulent fluctuations leads to increased mean particle size at the edge of the plume. The extent of this increase is strongly dependent on the choice of micromixing timescale.