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首页> 外文期刊>The Journal of Chemical Physics >Kinetic model for binary homogeneous nucleation in the H_2O-H_2SO_4 system: Comparison with experiments and classical theory of nucleation
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Kinetic model for binary homogeneous nucleation in the H_2O-H_2SO_4 system: Comparison with experiments and classical theory of nucleation

机译:H_2O-H_2SO_4体系中二元均相成核的动力学模型:与实验和经典成核理论的比较

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摘要

A kinetic model to predict nucleation rates in the sulfuric acid-water system is presented.It allows calculating steady-state nucleation rates and the corresponding time lag,using a direct solution of a system of kinetic equations that describe the populations of sub- and near-critical clusters.This kinetic model takes into account cluster-cluster collisions and decay of clusters into smaller clusters.The model results are compared with some predictions obtained with the classical nucleation theory (CNT) and also with available measurement data obtained in smog chambers or flow tubes.It is shown that in the case of slow nucleation processes,the kinetic model and the CNT as used by Shugard et al.[J.Chem.Phys.75,5298 (1974)] give the same results.However,in the case of intensive nucleation,a large part of the nucleation flux is due to cluster-cluster collisions and the CNT underestimates the nucleation rates.
机译:提出了一种预测硫酸-水系统中成核速率的动力学模型,该模型可以使用描述子井和近井总体的动力学方程组的直接解来计算稳态成核率和相应的时滞。临界团簇。该动力学模型考虑了团簇之间的碰撞和团簇向较小团簇的衰减,将模型结果与经典成核理论(CNT)获得的一些预测结果以及烟雾室或结果表明,在缓慢成核过程中,Shugard等人使用的动力学模型和碳纳米管[J.Chem.Phys.75,5298(1974)]给出了相同的结果。在强烈成核的情况下,很大一部分成核通量是由于簇-簇碰撞而导致的,而CNT低估了成核速率。

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