The effects of non-continuum hydrodynamics on the Brownian coagulation of aerosol particles

被引:17
作者
Chun, J. [1 ]
Koch, D. L. [1 ]
机构
[1] Cornell Univ, Sch Chem & Biomol Engn, Ithaca, NY 14853 USA
关键词
Brownian motion; coagulation; non-continuum hydrodynamics; van der Waals attraction;
D O I
10.1016/j.jaerosci.2005.05.002
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Most theoretical predictions of the rate of Brownian-induced coagulation have considered the continuum hydrodynamic resistance of the suspending gas or liquid as well as van der Waals and/or electrostatic forces. However, the mean-free path of the gas is comparable with the length scale at which van der Waals forces become important during the collision of two Brownian aerosol particles. We predict the initial rate of coagulation in a monodisperse aerosol driven by Brownian motion in the presence of van der Waals forces and non-continuum lubrication forces when the Knudsen number (ratio of the mean-free path to the particle radius) is small but non-zero. A comparison with experiments demonstrates the accuracy of the predictions and the importance of accounting for non-continuum effects to provide quantitative predictions of coagulation rates. (C) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:471 / 482
页数:12
相关论文
共 21 条
[1]  
[Anonymous], 1978, Microphysics of Clouds and Precipitation, DOI 10.1007/978-94-009-9905-3
[2]   Micro total analysis systems. 2. Analytical standard operations and applications [J].
Auroux, PA ;
Iossifidis, D ;
Reyes, DR ;
Manz, A .
ANALYTICAL CHEMISTRY, 2002, 74 (12) :2637-2652
[3]   BROWNIAN DIFFUSION OF PARTICLES WITH HYDRODYNAMIC INTERACTION [J].
BATCHELOR, GK .
JOURNAL OF FLUID MECHANICS, 1976, 74 (MAR9) :1-29
[5]  
Derjaguin B., 1941, Prog. Surf. Sci, V14, P633, DOI DOI 10.1016/0079-6816(93)90013-L
[6]   ON COAGULATION OF AEROSOLS .1. [J].
DEVIR, SE .
JOURNAL OF COLLOID SCIENCE, 1963, 18 (08) :744-&
[8]  
Fuchs N.A., 1964, MECH AEROSOLS
[9]   EFFECT OF SLIP ON MOTION OF A SPHERE CLOSE TO A WALL AND OF 2 ADJACENT SPHERES [J].
HOCKING, LM .
JOURNAL OF ENGINEERING MATHEMATICS, 1973, 7 (03) :207-221
[10]   EFFECT OF HYDRODYNAMIC INTERACTION ON COAGULATION RATE OF HYDROPHOBIC COLLOIDS [J].
HONIG, EP ;
ROEBERSE.GJ ;
WIERSEMA, PH .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1971, 36 (01) :97-&