Flow Visualization of Efflux from Composite Flow Networks by Means of PIV

An experimental study is performed on a composite flow network consisting of a diamond-shaped cylinder bundle sandwiched between two slit flows. A PIV measurement technique is employed to visualize flow phenomena which are recorded by means of a CCD camera. For comparison purpose, a traditional flow channel of rectangular cross section and a composite flow network with a diamond-shaped cylinder bundle in parallel with a slit flow or one side are tested. It is disclosed that the flip-flop flow generated inside the cylinder bundle assists the slit flows to stretch through suppressing the diffusing phenomenon of the efflux jet stream. The mechanisms for the stable efflux stretching are determined..