ABSTRACT
Visualization of fluid flow motion proved to be an excellent tool for describing and calculating flow properties in many problems of practical interest, in both subsonic and supersonic flow regimes. Flow visualization with smoke is generally done in a smoke tunnel. It is a low-speed wind tunnel carefully designed to produce a uniform steady flow in the test-section with negligible turbulence. Smoke tunnel is basically an open circuit, low-speed tunnel. The flow through the tunnel is induced by the suction of atmospheric air through the test-section, using a simple axial fan. For visualizing compressible flows, optical flow visualization techniques are commonly used. Particle image velocimetry (PIV) is an optical method of flow visualization. It can be used to obtain the instantaneous velocities and the related properties in fluid flows. For the PIV analysis on the flow, two exposures of laser light are required upon the camera from the flow.
