Abstract
Three-dimensional transient flow past a porous infinite plate is investigated when the suction velocity at the plate has the form $$v_w (z) = v_0 \left[ {1 + \varepsilon \delta (t) cos\frac{{\pi z}}{l}} \right], \varepsilon<< 1$$ where $$\begin{gathered} \delta (t) = 0, t 0. \hfill \\ \end{gathered} $$ Due to superimposed sinusoidal suction velocity ev0δ(t) cos πz/l, the flow becomes unsteady and three-dimensional. The Laplace transform technique is used to find the unsteady velocity distribution. The skin friction at the wall along the main and cross-flow directions is obtained. It is found that ast→∞ the values of skin friction tend to steady state values.
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