Numerical investigation of heterogeneous nucleation of water vapour on PM10 for particulate abatement
Numerical investigation of heterogeneous nucleation of water vapour on PM10 for particulate abatement
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水蒸气在 PM10 上异质成核以减少颗粒物的数值研究
DOI：
10.1002/cjce.23230
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发表时间：
2019-04
影响因子：
2.1
通讯作者：
Elham Doroodchi
中科院分区：
文献类型：
--
作者：
Fengxian Fan;Sihong Zhang;Zhengbiao Peng;Jun Chen;Mingxu Su;Behdad Moghtaderi;Elham Doroodchi
提出了一个考虑线张力效应、颗粒粗糙度效应和表面扩散机制的非均质形核模型。研究了颗粒粗糙度和润湿剂对异相成核行为的影响。对成核势垒进行了分析，并讨论了成核行为对蒸汽冷凝颗粒减排的影响。研究发现，线张力对颗粒粗糙度对成核行为的影响很大。存在一个最佳润湿剂浓度，在此浓度下，成核势垒和临界饱和比最低。对于直径Dp> 0.1 μm且胚胎尺寸小于临界尺寸的亲水性颗粒，表面扩散机制在控制胚胎生长方面起着至关重要的作用，否则直接气相沉积机制的贡献可能很大。基于缩放的成核势垒，已经确定了三种不同的成核机制，即非热非均质成核、热非均质主导成核和均质主导成核。当接触角较大时，可能需要添加润湿剂以减小接触角，从而达到非热非均质和热非均质主导的成核状态，从而以低成本实现有效的颗粒消除。预测结果与实验数据吻合较好。
A heterogeneous nucleation model with inclusions of the line tension effect, the particle roughness effect, and the surface diffusion mechanism was presented. Effects of the particle roughness and the wetting agent on the heterogeneous nucleation behaviour were examined. The scaled nucleation barrier was analyzed and subsequently implications of the nucleation behaviour in the particulate abatement by vapour condensation were discussed. It was found that the effect of particle roughness on the nucleation behaviour was greatly affected by the line tension. There existed an optimal concentration of wetting agent at which the lowest nucleation barrier and critical saturation ratio could be obtained. The surface diffusion mechanism played an overwhelmingly important role in governing the embryo growth for hydrophilic particles with a diameterDp> 0.1 µm and an embryo size smaller than the critical size, otherwise the contribution of direct vapour deposition mechanism could be significant. Based on the scaled nucleation barrier, three distinct nucleation regimes, i.e. athermal heterogeneous nucleation, thermal heterogeneous‐dominant nucleation, and homogeneous‐dominant nucleation, have been identified. When the contact angle was large, the wetting agent might need to be added to reduce the contact angle so as to reach the athermal heterogeneous and thermal heterogeneous‐dominant nucleation regimes, thus achieving efficient particulate abatement at low cost. The prediction results matched reasonably with the experimental data.
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影响因子：
5.2
作者：
Guangxue Zhang;Lili Zhang;Jie Wang;Eric Hu
通讯作者：
Eric Hu
影响因子：
4.4
作者：
FLETCHER, NH
通讯作者：
FLETCHER, NH
DOI：
10.1063/1.2358343
发表时间：
2006-10
期刊：
The Journal of chemical physics
影响因子：
--
作者：
A. Lauri;E. Zapadinsky;H. Vehkamäki;M. Kulmala
通讯作者：
A. Lauri;E. Zapadinsky;H. Vehkamäki;M. Kulmala
影响因子：
4.5
作者：
Yuchi Fan;F. Qin;Xisheng Luo;Zhang Jiaoshi;Jie Wang;Huaqiao Gui;Jianguo Liu
通讯作者：
Yuchi Fan;F. Qin;Xisheng Luo;Zhang Jiaoshi;Jie Wang;Huaqiao Gui;Jianguo Liu
影响因子：
5.5
作者：
B. Gorbunov;R. Hamilton;Nicola A. Clegg;R. Toumi
通讯作者：
B. Gorbunov;R. Hamilton;Nicola A. Clegg;R. Toumi