Nomura T, Alonso M, Kousaka Y, Tenjiku E
Chemical Engineering Department, Osaka Prefecture University, 1-1 Gakuencho, Sakai, 599-8531, Japan
J Colloid Interface Sci. 2000 Nov 1;231(1):107-113. doi: 10.1006/jcis.2000.7127.
From an engineering point of view the present authors have proposed the simple model of a homogeneous nucleation relationship in the liquid phase that can predict the number concentration of nucleated particles in various operating conditions. Experiments of liquid-phase nucleation in which the precursor monomers were generated by several methods have successfully confirmed the predictions of the model. In the present paper, our previous model of homogeneous nucleation is extended to the case in which the precursor monomers are generated in a gas-phase system. First, a relationship between number concentration and mean volume diameter of nucleated aerosol particles and operating conditions is obtained considering the free molecular regime around the critical nuclei, which is the main difference with the liquid phase. Second, the validity of the relation lies in experimental use of dioctyl sebacate particles generated by evaporation-condensation. As a result, the predictions are in excellent agreement with the experimental results after considering substantial losses of monomers and particles to the walls of the experimental system because in the gasphase the diffusion velocity and the critical supersaturation ratio of monomer are higher than those in the liquid phase. Copyright 2000 Academic Press.
从工程学角度来看，本文作者提出了一个液相中均匀成核关系的简单模型，该模型能够预测在各种操作条件下成核粒子的数浓度。通过几种方法生成前驱体单体的液相成核实验已成功证实了该模型的预测结果。在本文中，我们先前的均匀成核模型扩展到了前驱体单体在气相系统中生成的情况。首先，考虑到临界核周围的自由分子状态（这是与液相的主要区别），得出了成核气溶胶粒子的数浓度与平均体积直径以及操作条件之间的关系。其次，该关系的有效性在于对通过蒸发 - 冷凝产生的癸二酸二辛酯颗粒进行的实验应用。结果，在考虑到单体和粒子大量损失到实验系统壁上之后，预测结果与实验结果非常吻合，因为在气相中单体的扩散速度和临界过饱和比高于液相中的。版权所有2000，学术出版社。
