A single-camera coupled PTV-LIF technique

A single-camera coupled particle tracking velocimetry-laser-induced fluores cence (PTV-LIF) technique and validation results from an experiment in a ne utrally buoyant turbulent round jet are presented. The single-camera implem entation allows the use of a 12-bit 60 frame-per-second 1024 x 1024 pixel d igital CCD camera capable of streaming images in real time to hard disk res ulting in very accurate PTV and LIF with excellent spatial and temporal res olution. The technique is capable of determining the turbulent scalar flux, <(u(i)<prime>c ' )over bar> as well as the Reynolds stress and mean and fl uctuating velocity and concentration fields. Details of dye choice, correct ions for attenuation due to dye, particles and water, photobleaching, vigne tting, CCD calibration, and illumination power and geometry corrections are presented. Detailed results from the validation experiment confirm the acc uracy and resolution of the technique, and in particular, the ability to me asure <(u(i)<prime>c ' )over bar>. Bootstrap 95% uncertainty intervals are presented for the calculated statistics.