火焰场纳米颗粒间长程相互作用对碰撞率增强效应的研究

Effect of Long-range Interactions on the Enhancement of Nanoparticle Collision Rate in Flames

针对纳米氧化物颗粒间偶极相互作用力和范德华力对碰撞率的增强作用,我们通过两体动力学建模和量纲分析的方法,分别给出了仅有偶极相互作用力,仅有范德华力,和偶极相互作用力与范德华力同时存在情况下,碰撞率增强因子的拟合公式。探究了两种力同时存在的情况下,两种力对增强因子的贡献占比,发现随着无量纲数D_(vdw)和D_(dipole)相对大小的变化,增强因子出现了由范德华力决定,由两种力共同决定和由偶极相互作用力决定三种情况。

To investigate the enhancement effect of dipole-dipole interaction force and van der Waals force on nano-oxide particles collision rate, we apply two-body dynamics modeling and dimensional analysis to obtain the fitted formulas for the enhancement factor of collision rate in the presence of dipole-dipole interaction forces only, van der Waals forces only, and both dipole-dipole interaction forces and van der Waals forces respectively. When the two forces exist at the same time,the contribution ratio of the two forces to the enhancement factor is explored, and it is found that the fitting formula of the enhancement factor can be divided into three stages: dominated by van der Waals forces, dominated by both forces together and dominated by dipole-dipole interactions with the change of the relative magnitudes of the dimensionless number D_(vd)wand D_(dipole).