Flow over a slot-perforated flat surface between two parallel plates

A theoretical and experimental study is performed to investigate unsteady, two-dimensional, incompressible fluid flow over both sides of a slot-perfor ated flat surface which is placed in a two-dimensional channel The governin g boundary-layer equations are discretized by means of a finite-difference technique to determine streamwise and transverse velocity components The ro les of both the Reynolds number and the ratio of the slot width, d, to the plate thickness, delta, on the velocity field are disclosed. It is found fr om the study that: (i) the flow Pattern between two Plates can be classifie d into four categories depending on a combination of Re and d/delta, (ii) a t a small value of Re and/or d/delta, flow over the slot exhibits no timewi se variation, (iii) when Re and d/delta exceed certain values, an alternate crossing of flow from one side of the Plate to the other occurs across the slot, and (iv) a further increase in Re results in a complex flow both ins ide the slot a,td on the plate downstream of the slot. These results are co nfirmed by the flow visualization using ion-exchange resins.