Wind tunnel experiments on smoke diffusion from a chimney

Abstract

Abstract The diffusion of heated and unheated jets from a chimney was investigated in cross flows with large-scale turbulence generated by a Makita-type active turbulence generator and with gird generated turbulence. The behavior of jet with smoke was observed by a high-speed camera. The smoke was dispersed more widely by meandering motion in the large-scale turbulence. The turbulent eddies corresponding to the integral scale should effectively contribute to the meandering smoke diffusion. The time-averaged smoke concentration distribution was obtained from the brightness values of instantaneous images. The stream-wise variations of the smoke diffusion width and the smoke flow center were evaluated from the distribution. Obtained data were compared with previous correlations.