Plot of ∥v2∥ values at a fixed point ahead of a sharp edge vs. tip angle α (cf. Fig. 3). The dimensions of the channel are h = 200 μm, H = 600 μm and L = 300 μm. Open circles denote computed data points corresponding to α = 7.5° , 15° , 30° , 45° , and 60° . In all cases, ∥v2∥ was calculated at the point lying on a line emanating from the tip of a sharp edge parallel to the y direction and a distance away from the tip equal to twice thickness of the Stokes boundary layer.