Figure 2.

comsol multiphysics simulations of the fluid flow behavior at the DEP-FFF chamber withdrawal slot for different geometries and flow rates. (a) When the withdrawal slot width d_out is small compared with the chamber height H, optimum skimming behavior is observed with negligible vortices or regions of low flow rate; (b) as the relative withdrawal slot width is increased, a vortex forms within the slot, streamlines from the main channel are depressed into the slot region and zones of low flow rate appear; (c) the skimming height h_s accurately follows that predicted by simple Poiseuille flow theory (seetext). Vorticity (d) and depression of the streamlines from the main channel (e) increase with increasing slot width.