Turbulent Prandtl Number in Neutrally Buoyant Turbulent Round Jet
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A method which combines two nonintrusive imaging techniques, particle tracking velocimetry and laser induced fluorescence, was used to make simultaneous measurements of velocity and concentration in a neutrally buoyant turbulent round jet. The measurements were made at two different Reynolds numbers (R), 360 and 4,210, at a Schmidt number of 1,930. The mean velocity , mean concentration , Reynolds stress - , and turbulent scalar flux were obtained and the eddy viscosity, eddy diffusivity, and turbulent Prandtl number (Prs) calculated from these measurements. Both the low and high Reynolds number results show self-similar characteristics that are dependent on R with Prs a function of radial position. For the R=4,210 case, it was found that 0.70.12. For the R=360 case, it was found that Pr1≈ 0.4 for 0.06
author list (cited authors)
Chang, K., & Cowen, E. A.