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THE TURBULENT STATISTICS IN THE WAKE OF A SHORT STACK

Muyiwa S. Adaramola
Division of Environmental Engineering University of Saskatchewan 57 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 5A9

Donald J. Bergstrom
Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, S7N 5A9, Canada

David Sumner
Department of Mechanical Engineering University of Saskatchewan 57 Campus Drive, Saskatoon, Saskatchewan, S7N 5A2, Canada

Abstract

The characteristics of the turbulent statistics along the wake centreline of a stack was experimentally studied in a low-speed wind tunnel using thermal anemometry. The cross-flow Reynolds number was ReD = 2.3×104, and the jetto- 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-stackheight ratio of δ/H = 0.5 at the location of the stack. The turbulent statistics are found to be strongly influenced by the value of R. The Reynolds shear stress and the triple correlation were strongly influenced by the local velocity gradient, especially for lower values of R within the stack wake and within the jet wake for higher values of R within the jet wake. The skewness and flatness factors indicated a strong deviation from a Gaussian distribution, which is evidence of the complexity of the flow.