Flow Visualization on Inside and Openig Region of an Open Cavity Array in a Horizontal Wall Surface

Flow Visualization on inside and opening region in an Open Cavity Array is experimentally studied under the following conditions: the range of the depth-to-width ratio and Reynolds number are from 0.1 to 3.0 and from 2.0×103 to 5.5×104 repectively. Flow observation is studied by means of the following two technique: one is the scattering method of alminum powder on the water surface of the cavity array model, the other is dye tracer technique in the closed vertical model of the side wall. Flow pattern on inside region of the cavity array is influenced both the depth-to-width ratio and Reynolds number. Flow visualization on the opening region of the open cavity array by tracer technique is as follow: the movement of fluid particles is unsteady with chaotic movement on the different direction superimposed on the external main stream.