Fig. 9. Neutral curves for lateral modenumber n ¼ 1 for a narrow channel ðB ¼ 500 mÞ with non-linear friction. The solid and dashed curves refer to e ¼ 0 (inertia ignored) and e ¼ 0:07; respectively. To scale k with the width, one can multiply these values by a factor B=c ¼ 0:07:
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