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2D duct

Biot (1956b) shows that for a 2D duct, i.e., fluid between two planes separated by a distance 2a1, $F(\xi) \to 1$ as $\omega \to 0$ and
F(\xi) \to (-i)^{1/2}{{\xi}\over{3}}
 \end{eqnarray} (38)
as $\omega \to \infty$. Here $\xi = (\omega a_1^2/\eta)^{1/2}$with a1 being half the separation distance between the planes.

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