Abstract
Low Prandtl number convection is investigated in vertical axisymmetric turbulent buoyant jets of sodium discharging into a slowly moving ambient. Measurements of mean velocity and mean temperature profiles are performed. By varying the ratio of momentum to buoyancy flux, that is, the densimetric Froude number, different intensities of buoyancy are obtained. The mixed convection flow is compared with forced convection and plume flow. Using a recently developed temperature-compensated miniature permanent magnet flowmeter probe, Gaussian profiles of velocity and temperature are obtained that are independent of the flow regime at all axial measuring positions. The axial decay of the centerline mean velocity for sodium is the same as for fluids of higher Prandtl number. It shows power laws with powers of −1 for forced convection, −2 3 for a transition region, and −1 3 for plumes. The centerline mean temperature for sodium and a plume decreases with power −1, which is in contrast to the −5 3 decay for plumes and fluids of higher Prandtl number. The results of the sodium experiments are compared with data for water and air flows from the literature.
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