HOMOGENEOUS NUCLEATION OF PARTICLES FROM THE VAPOR-PHASE IN THERMAL PLASMA SYNTHESIS
HOMOGENEOUS NUCLEATION OF PARTICLES FROM THE VAPOR-PHASE IN THERMAL PLASMA SYNTHESIS
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DOI：
10.1007/bf01083672
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发表时间：
1989-09-01
影响因子：
3.6
通讯作者：
CHIU, CP
中科院分区：
文献类型：
--
作者：
GIRSHICK, SL;CHIU, CP
采用一维流场和解耦的化学和气溶胶动力学模型，模拟了热等离子体反应器中铁蒸气粒子的成核和生长过程。包括蒸发和凝聚项在一组集群平衡速率方程，一个明确定义的均匀成核事件的计算。在成核之后，蒸气相通过冷凝而迅速耗尽，并且此后纯粹通过棕褐色凝聚而发生颗粒生长。成核粒子的大小和数量被发现受到强烈的冷却速率和初始单体浓度。的气溶胶的响应时间变化的热力学条件的解释。
Particle nucleation and growth are simulated for iron vapor in a thermal plasma reactor with an assumed one-dimensional flow field and decoupled chemistry and aerosol dynamics. Including both evaporation and coagulation terms in the set of cluster-balance rate equations, a sharply defined homogeneous nucleation event is calculated. Following nucleation the vapor phase is rapidly depleted by condensation, and thereafter particle growth occurs purely by Browntan coagulation. The size and number of nucleated particles are found to be affected strongly by the cooling rate and by the initial monomer concentration. An explanation is presented in terms of the response time of the aerosol to changing thermodynamic conditions.