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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

REYNOLDS STRESS MEASUREMENTS IN THE WAKE OF A STACK PARTIALLY IMMERSED IN A TURBULENT BOUNDARY LAYER

pages 1249-1254
DOI: 10.1615/TSFP6.1990
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SINOPSIS

Some characteristics of the Reynolds stress field in the wake of a stack were experimentally studied in a low-speed wind tunnel using thermal anemometry. The cross-flow Reynolds number was ReD = 2.3×104, and the jet-to-cross-flow velocity ratio was varied from R = 0 to 3. The stack was partially immersed in a flat-plate turbulent boundary layer, with a boundary layer thickness-to-stack-height ratio of δ/H = 0.5 at the location of the stack. The spanwise characteristics of the time-averaged streamwise and wallnormal velocities varied along the stack height (z/H) and with the value of R. Likewise, the streamwise and wallnormal turbulence intensities as well as the Reynolds shear stress varied with the stack height z/H and were strongly influenced by the value of R. The behaviour of the shear correlation coefficient indicated that there is more turbulent mixing within the vicinity of the free end of the stack than at mid-height.

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