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Abstract
An experimental study of the effects of buoyancy forces resulting from temperature differences on the mean flow and turbulence characteristics of a plane turbulent jet discharged at an angle to the horizontal has been undertaken. The jets were generated by discharging air through a rounded nozzle which was 10 mm wide by 580 mm long. The discharged air could be heated and tests were undertaken with discharge temperatures of 20° and 40°C above the ambient air temperature at a single nozzle discharge velocity which gave a discharge Reynolds number of approximately 1700. Tests were undertaken with angles of jet discharge to the horizontal of 0°, 30°, 60° and 90°. Velocity and temperature measurements were undertaken using hot wire anemometers. Measurements of the mean velocity and temperature, the turbulence normal and shear stresses, the temperature fluctuation intensity and the two components of the turbulence heat flux were obtained. Profiles of these quantities were measured at six equally spaced positions to a distance of approximately 60 nozzle widths from the discharge plane. Measurements at much more closely spaced intervals were also taken along the jet “centre-line”, this being defined as the locus of the point of maximum velocity in the jet.