Experimental Study for Smoke Diffusion in a Vertical Cylinder

Abstract

This experimental study was conducted to investigate the spread of fire smoke through the vertical penetration passage of a skyscraper. Vertical cylinders were used to observe the smoke diffusion phenomenon in the vertical direction, and the conditions of the limited heat source were constructed. Experimental measurements of the vertical diffusion of the plume generated from the pyrolysis source with natural buoyancy was carried out, and the effect of the cylinder wall was observed. The results were compared with the results of the theoretical equations and numerical analysis and analyzed. It was observed that the plume limited by the vertical cylinder tends to diffuse to the periphery while puffing, similar to the open plume at the initial stage generated in the heat source. However, it was observed that the pipe flow developed while moving upward. In addition, as the cross-sectional area decreased owing to the wall surface of the cylinder, and as the calorific value of the heat source increased, the pipe flow developed rapidly. Keywords: Fire Dynamics Simulator, Buoyant Smoke Diffusivity, High-rise Buildings, Vertical cylinder, Confined Environments