Fig. 1.

Cell collision and capture events in microfluidic 2D arrays of cylindrical obstacles are governed by the array geometry, cell size, cell and surface chemistry, and flow rate (and thus local velocity and shear stress). Large arrays minimize edge effects and can be divided into “unit structures” with symmetric boundaries; these unit structures can be repeated as needed to simulate arrays of arbitrary size. The velocity field shown here is for a Γ = Λ = 150 µm array with Δ = 22 µm, 2r = 100 µm and a mean velocity of 100 µm/s.