Characterization of the aerosol particle lift force

Inertial migration of aerosol particles in three-dimensional microfluidic channels

“…Particles eventually reach two stable equilibrium positions (upper Z * 1 = 0.756 and lower Z * 2 = 0.241) after experiencing an overshoot. This overshoot is due to the large relative velocity difference between fluid and particle at the beginning, which generates large Saffman force ( Fan, McFarland, & Anand, 1992 ) driving particles moving towards the channel center. However, these overshoots are finally eliminated by other lateral lift forces.…”

Interferences to Aerosol Sampling

“…This, however, is not the complete picture. Fan et al (1992) studied the problem analytically and, from the equations of motion for the particle transport in the tube, characterised the contribution of the lift force in terms of the dimensionless lift number, Pl, given by: The scenario is shown schematically in Figure 7.10.…”

“…They noted in particular that the main effect of the turbulent motions in the external air approaching the sampling inlet was to increase the deposition inside the tube. Copyright (1987), with permission from Elsevier It was noted by Fan et al (1992) that, during such consideration of the losses of particles during the entry of particles into a tube inlet in the work cited, the possible dependence on the Saffman lift force had not been included, despite its potential importance. Kalatoor et al, 1995;Cain and Ram, 1998;Gao et al, 1999).…”