PARTICLE-IMAGING TECHNIQUES FOR QUANTITATIVE FLOW VISUALIZATION - A REVIEW

A number of optical techniques used for extracting quantitative inform ation about the velocity components in a flow field are considered. Th e techniques described in this paper provide information that augment measurements using the traditional methods such as, hot-wire and laser Doppler anemometry. The principle underlying each technique is based on introducing individual flow tracers in a flow field and extracting information about their simultaneous displacements over a short interv al of time. The high spatial resolution and good accuracy achieved by these techniques are mainly attributed to the significant advances mad e in the field of image processing technology.