Experiments on the buoyant plume above a heated horizontal wire

摘要: Abstract The free-convection temperature field within a buoyant plume rising from heated horizontal wire was explored experimentally. Laminar flow measurements were facilitated by use of an isolating enclosure. laminar exhibited slow, regular swaying motion. quantitative dependence the on heating rate and elevation above wire, as deduced experimental data, found to be in excellent accord with analytical predictions for induced line heat source. Measured profiles at range elevations rates also agreed well theory. Turbulent bursts occurred higher rates, thus signalling onset transition. frequency increased increases rate. transition, indicated initial appearance turbulent bursts, modified Grashof number 5 × 108. Essentially fully-turbulent conditions prevailed when 109.