- Author
- Matsushita, T. | Fukutani, H. | Matsumoto, M.
- Title
- Mathematical Model and Experiments of Axisymmetric Spread of Smoke Front Under Ceiling. Part 1. Axisymmetric Spread of Density Flow Front With Constant Density.
- Journal
- Bulletin of Japan Association for Fire Science and Engineering, Vol. 48, No. 1, 19-24, 1998
- Keywords
- ceilings | mathematical models | experiments | smoke | density effects
- Abstract
- ONLY ABSTRACT IN ENGLISH The purpose of this paper is to describe a mathematical model for the prediction of horizontal axisymmetric spread of smoke front under ceiling. In Part 1, the constant density flow is treated to clear the mechanism of front movement of axisymmetric density flow. The mathematical model divided into three regions of characteristic flow pattern is constructed. The region 1 is a plume, the region 2 is a transient flow after impingement of plume on horizontal plane and the region 3 is a gravity flow. The region 1 is considered as steady state, the main treatment region of this paper is 2 and 3 where the transient movement of front of density flow is treated. The prediction of a mathematical model in region 2 and 3 is compared with model experiments of constant density flow using dyed salt water and fresh water. The calculation results of the front location of constant density flow after impingement on floor agree well with the experimental results using salt water and fresh water. Therefore a mathematical model of axisymmetric spread of constant density flow is able to use to predict the front location of density flow. In region 2, it is necessary to more consider the effect of viscosity for inertia transient flow.