Variation of plate height with velocity for serpentine channels with taper ratios 1, 2, and 3. See Table 2 for device details. The solid and dashed lines compare the average plate heights of taper ratio 1 and taper ratios 2 and 3, respectively. Results are compared with data from the 22-cm spiral channel in [28]. Data are from mannose 5, 6, and 9, and error bars are ±σ for n = 3 for plate height and velocity.