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

Attachment Efficiency of Polydisperse Nanoparticles Wall-Deposition

“…where dp is the particle diameter, Z 0 is the distance at which the van der Waals force comes to exert, which is typically taken as 16.5-40 nm, A is the Hamaker constant 34) :…”

New expression for collision efficiency of spherical nanoparticles in Brownian coagulation

“…The results are shown in Table 4. According to the expression of the collision effeciency proposed by Chun [9] , a non-linear curve fitting method is used to deal with the data listed in Table 4. Figure 5 shows the fitting curve as well as experimental data given by Devir [18] , where the curve fitting expression is…”

“…For Brownian coagulation, the rate of the number change of singlet particles per unit volume is directly proportional to the ideal rate k 0 and the collision efficiency α. k 0 occurs in the absence of interparticle hydrodynamic and colloidal interactions, and α denotes the probability of the coagulation between two particles in the collision process [9] . k 0 has been determined by Smoluchowski, while the accurate collision efficiency α has not been found.…”

“…Russel et al [10] calculated the rate of the Brownian coagulation of nanoparticles in the presence of van der Waals force. To predict the initial coagulation rate, Chun and Koch [9] studied the effects of non-continuum lubrication force and van der Waals force during the coagulation process of monodisperse nanoparticles. Feng and Lin [11] studied the collision efficiency in the presence of van der Waals force and elastic deformation force.…”

Collision efficiency of two nanoparticles with different diameters in Brownian coagulation

“…Russel et al [11] calculated the rate of the Brownian coagulation in the presence of the van der Waals force. Chun and Koch [12] studied the effect of the non-continuum lubrication force and the van der Waals force in the coagulation process for predicting the initial coagulation rate. The elastic force aroused from the particle deformation in the process of collision is one of the factors affecting the collision efficiency.…”