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Velocity vectors in the bifurcation plane of the trachea and two main bronchi (G0-1) near flow reversal. Red, negative (downward) axial velocity; blue, positive (upward) axial velocity. (a) NORM, (b) HFNR and (c) HFOV. Instantaneous Reynolds numbers at the trachea are 241 for (a) and (b), and 684 for (c).
