Experimental Study on Turbulence Structure in Turbulent Plane Forced Plume

Experimental results on the mean and turbulent properties, notably the Reynolds shear stress and turbulent heat fluxes of turbulent plane jets and plumes are presented. All the quantities have been measured using two-component hot-film anemometry and resistence thermometry in the developed flow region of hot water issuing into low speed coflowing stream from a sharp-edged rectangular slot of 0.4cm wide. The results show that buoyancy increases the turbulence levels in plumes when compared with jets. For example, the maximum Reynolds shear stress is nearly 60% higher in plumes. The constant eddy viscosity model is found to be applicable to describe the turbulence structure in both flows. Furthermore, the differences in turbulent kinetic energy balance between both flows are examined. The buoyant production of turbulent energy is about 30% of the shear production in plumes.