Abstract
For a thermally buoyant plume in stably stratified ambient air at the heating rate Q = 0.32-27.8 W/m, flow patterns are visualized experimentally, the time-dependent temperature is measured, and the power spectrum density (PSD) is obtained. The PSDs have gradients with -9/2 and -8.0 in the laminar state and -5 and -3.0 in the turbulent state. In addition, the frequency hand of turbulence is higher than that of the swaying motion, where stable stratification increases the swaying frequency by 37% at the stratification degree st = 0.3 K/cm. Flow regions of the laminar, transitional, and turbulent states at any location are determined. When the flow regions are plotted on visualization photographs, the turbulent transition, reverse transition, and relaminarization are specified and compared with unstratified results
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