平面射流场中纳米颗粒的成核与凝并

刘演华; 干富军; 张凯

doi:10.7498/aps.59.4084

摘要

采用大涡模拟和直接积分矩方法，数值模拟了在Reynolds数为8300的平面射流中，水蒸气（相对湿度φ=70%）和硫酸蒸气（质量分数为5×10-6）二元体系中纳米颗粒的成核与凝并，详细分析了颗粒数密度、体积密度和平均粒径的分布.计算结果表明.射流场混合动量厚度的增长和实验结果一致；射流场的拟序结构导致了涡核中心处硫酸蒸气浓度的明显减小，而纳米颗粒数密度则明显增加；拟序结构的出现导致颗粒碰撞概率增大，提高了颗粒凝并效率；在颗粒数密度较大的涡核中心，颗粒成核作用增强，从而加

关键词:

纳米颗粒 /
成核 /
凝并 /
平面射流

Abstract

The nucleation and coagulation of nanoparticles in the binary system of water vapor (relative humidity 70%) and sulfuric acid vapor (5×10-6) were detailedly studied by performing numerical simulation in a planar jet (Re=8300). The large eddy simulation was utilized to calculate the flow field, and the particle field is obtained by using the direct quadrature method of moment to solve the particle general dynamic equation. The distributions of particle number concentration, volume concentration and average diameter were discussed. The result shows that the growth of the calculated momentum thickness is consistent with the previous experimental data. The interface of the jet will roll up and generate the coherent vortices which will lead to an obvious decrease of the specie concentration of sulfuric acid vapor and increase of number concentration of nanoparticles in the vortex core. The appearance of the coherent vortices increases the possibility of particle collision and enhances the particle coagulation. The nanoparticle nucleation is enhanced in the vortex core where high particle number concentration will accelerate the particle coagulation.

Keywords:

作者及机构信息

(1)澳大利亚皇家墨尔本理工大学航空学院，墨尔本 3083; (2)浙江大学力学系，杭州 310027

基金项目: 国家自然科学基金重点项目(批准号：　10802083）资助的课题.

Authors and contacts

(1)澳大利亚皇家墨尔本理工大学航空学院，墨尔本 3083; (2)浙江大学力学系，杭州 310027

参考文献

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[15]	］Yu M Z, Lin J Z, Chan T L 2008 Powder Technol. 181 9
[16]	］Yin Z Q, Lin J Z, Zhou K 2008 J. Appl. Math. Mech. 29 153
[17]	］Yu M Z, Lin J Z, Chan T L 2008 Chem. Eng. Sci. 63 2317
[18]	］Feng Y, Lin J Z 2008 Chin. Phys. 17 4547
[19]	］Lin J Z, Shi X, Yu Z S 2003 Int. J. Multiphase Flow 29 1355
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[21]	］Fox R O 2003 Computational Models for Turbulent Reacting Flow (Oxford: Oxford University Press)
[22]	］Marchisio D L, Fox R O 2005 J. Aerosol Sci. 36 43
[23]	］Vanni M 2000 J. Colloid Interf. Sci. 221 143
[24]	］Diemer R B, Olson J H 2002 Chem. Eng. Sci. 57 2211
[25]	］Park S H, Lee K W, Otto E, Fissan H 1999 J. Aerosol Sci. 30 3
[26]	］Otto E, Fissan H 1999 Adv. Powder Technol. 10 1
[27]	］McGraw R, Nemesure S, Schwartz S E 1998 J. Aerosol Sci. 29 761
[28]	］Holmes N S 2007 Atmos. Environ. 41 2183
[29]	］Vehkamaki H, Kulmala M, Lehtinen K E J, Noppel M 2003 Environ. Sci. Technol. 37 3392
[30]	］Upadhyay R R, Ezekoye O A 2006 J. Aerosol Sci. 37 799
[31]	］Otto E, Fissan H, Park S H, Lee K W, Otto E 1999 J. Aerosol 2 Sci. 30 17
[32]	］Pratsinis S E, Kim K S 1989 J. Aerosol Sci. 20 101
[33]	］Le Ribault C, Sarkar S, Stanley S A 1999 Phys. Fluids 11 3069
[34]	］Thomas F O, Chu H C 1989 Phys. Fluids 1 1566
[35]	］Vehkamaki H, Kulmala M, Napari I, Lehtinen K E J, Timmreck C, Noppel M, Laaksonen A 2002 J. Geophys. Res. 107 4622

施引文献

[1]	［1］Penttinen P, Timonen K L, Tiittanen P, Mirme A, Ruuskanen J, Pekkanen L 2001 Environ. Health Perspect. 109 319
[2]	［2］Meng L J, Zhang K W, Zhong J X 2007 Acta Phys. Sin. 56 1009 　(in Chinese)　［孟利军、张凯旺、钟建新 2007 56 1009］
[3]	［3］Li J, Liu W L, Meng L J, Zhang K W, Zhong J X 2008 Acta Phys. Sin. 57 382 （in Chinese）［李俊、刘文亮、孟利军、张凯旺、钟建新 2008 　 57 382］
[4]	［4］Friedlander S K 2000 Smoke, Dust, and Haze : Fundamentals of Aerosol Dynamics (Oxford: Oxford University Press )
[5]	［5］Talukdar S S, Swihart M T 2004 J. Aerosol Sci. 35 889
[6]	［6］Wang L, Marchisio1 D L, Vigil R D, Fox R O 2005 J. Colloid Interf. Sci. 282 380
[7]	［7］Liu S, Lin J Z 2008 J. Hydrodyn. 20 1
[8]	［8］Lemmetty M, Ronkko T, Virtanen A, Keskinen J, Pirjola L 2008 Aerosol Sci. Technol. 42 916
[9]	［9］Miller S E, Garrick S C 2004 Aerosol Sci. Technol. 38 79
[10]	］Lin J Z, Chan T L, Liu S, Zhou K, Zhou Y, Lee S C 2007 Int. J. Nonlin. Sci. Num. 81 45
[11]	］Yu M Z, Lin J Z, Chen L H 2007 J. Appl. Math. Mech. 28 1445
[12]	］Yu M Z, Lin J Z, Chen L H 2006 Acta Mech. Sin. 22 29
[13]	］Yin Z Q, Lin J Z, Zhou K, Chan T L 2007 Int. J. Nonlin. Sci. Num. 81 535
[14]	］Yu M Z, Lin J Z, Xiong H B 2007 Chin. J. Chem. Eng. 15 828
[15]	］Yu M Z, Lin J Z, Chan T L 2008 Powder Technol. 181 9
[16]	］Yin Z Q, Lin J Z, Zhou K 2008 J. Appl. Math. Mech. 29 153
[17]	］Yu M Z, Lin J Z, Chan T L 2008 Chem. Eng. Sci. 63 2317
[18]	］Feng Y, Lin J Z 2008 Chin. Phys. 17 4547
[19]	］Lin J Z, Shi X, Yu Z S 2003 Int. J. Multiphase Flow 29 1355
[20]	］Smagorinsky J 1963 Month. Wea. Rev. 91 99
[21]	］Fox R O 2003 Computational Models for Turbulent Reacting Flow (Oxford: Oxford University Press)
[22]	］Marchisio D L, Fox R O 2005 J. Aerosol Sci. 36 43
[23]	］Vanni M 2000 J. Colloid Interf. Sci. 221 143
[24]	］Diemer R B, Olson J H 2002 Chem. Eng. Sci. 57 2211
[25]	］Park S H, Lee K W, Otto E, Fissan H 1999 J. Aerosol Sci. 30 3
[26]	］Otto E, Fissan H 1999 Adv. Powder Technol. 10 1
[27]	］McGraw R, Nemesure S, Schwartz S E 1998 J. Aerosol Sci. 29 761
[28]	］Holmes N S 2007 Atmos. Environ. 41 2183
[29]	］Vehkamaki H, Kulmala M, Lehtinen K E J, Noppel M 2003 Environ. Sci. Technol. 37 3392
[30]	］Upadhyay R R, Ezekoye O A 2006 J. Aerosol Sci. 37 799
[31]	］Otto E, Fissan H, Park S H, Lee K W, Otto E 1999 J. Aerosol 2 Sci. 30 17
[32]	］Pratsinis S E, Kim K S 1989 J. Aerosol Sci. 20 101
[33]	］Le Ribault C, Sarkar S, Stanley S A 1999 Phys. Fluids 11 3069
[34]	］Thomas F O, Chu H C 1989 Phys. Fluids 1 1566
[35]	］Vehkamaki H, Kulmala M, Napari I, Lehtinen K E J, Timmreck C, Noppel M, Laaksonen A 2002 J. Geophys. Res. 107 4622

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