Measurement of characteristics of internal fluctuation in meandering plume by line image measurement using an atmospheric diffusion wind tunnel

Abstract

Particle diffusion experiments were conducted in a short-time diffusion field where the meandering diffusion is dominant using a wind tunnel with active grid. Relative diffusion and meandering diffusion were separately measured by visualization line measurement using laser and line scan camera. Each diffusion scales, total diffusion, relative diffusion, and meandering diffusion were obtained, and it was confirmed that they almost agreed with the Gifford's theorem. The intermittency shows a different tendency in the total diffusion and relative diffusion in the downstream direction and the relationship with the meandering ratio which is the scale of the diffusion field was obtained.